GMC Sierra (2014 – 2018) – fuse box diagram

Year of production: 2014, 2015, 2016, 2017, 2018

Engine Compartment Fuse Block

The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle.

Micro J-Case Fuses	Usage
1	Trailer Brake
2	Trailer Battery

 

J-Case Fuses	Usage
3	Antilock Brake System Pump
4	Instrument Panel BEC 1
5	Spare
6	4WD Trec
7	Spare
8	Instrument Panel BEC 2
9	Spare
10	Rear Window Defogger
11	Starter
12	Cooling Fan 1
13	Cooling Fan 2

 

Mini Fuses (2 Pin)	Usage
14	Trailer Stop/Turn Lamps, Left
15	Trailer Parking Lamps
16	Trailer Back-up Lamp
17	Trailer Stop/Turn Lamps, Right

 

Micro Fuses (2 Pin)	Usage
18	Fuel Pump
19	Integrated Chassis Control Module
20	Electronic Suspension Control Module
21	Fuel Pump Power Module
22	Upfitter Switch 1
23	Upfitter 2
24	Front Wiper
25	Antilock Brake System Valves
26	Upfitter SW 2
27	Upfitter SW 3
28	Parking Lamps, Right
29	Parking Lamps, Left
30	Upfitter 3
31	Upfitter SW 4
32	Upfitter 4
33	Back-up Lamps
34	Engine Control Module Ignition
35	Air Conditioning Compressor Clutch
36	Heated Mirrors
37	Upfitter 1
38	Center High-Mounted Stoplamp
39	Miscellaneous Ignition
40	Transmission Ignition
41	Fuel Pump 2
42	Cooling Fan Clutch
43	Engine
44	Fuel Injectors A, Odd
45	Fuel Injectors B, Even
46	Oxygen Sensor B
47	Throttle Control
48	Horn
49	Fog Lamp
50	Oxygen Sensor A
51	Engine Control Module
52	Interior Heater
53	Spare
54	Aeroshutter
55	Front Washer

 

Micro Fuses (3 Pin)	Usage
56	Air Conditioning Compressor/Battery Regulated Voltage Control
57	Air Conditioning CompressorModule/Battery Pack
58	Transmission Control Module/Engine Control Module
59	Headlamps

 

Micro Relays	Usage
60	Fuel Pump
61	Upfitter 2
62	Upfitter 3
63	Upfitter 4
64	Trailer Parking Lamps
65	Run/Crank
66	Upfitter 1
67	Fuel Pump 2
68	Air Conditioning Control
69	Starter
70	Rear Window Defogger
71	Engine Control Module

 

Solid State Relay	Usage
72	Cooling Fan Clutch

Instrument Panel Fuse Block (Left)

The left instrument panel fuse block access door is on the driver side edge of the instrument panel.

Number	Usage
1	Accessory Power Outlet 2
2	SEO Retained Accessory Power
3	Universal Garage Door Opener/Inside Rearview Mirror
6	Body Control Module 3
7	Body Control Module 5
8	Driver Window Switch/Mirror Switch
9	Spare
10	Accessory Power Outlet Retained Accessory Power
11	Accessory Power Outlet Battery
12	Accessory Power Outlet 1/Cigarette Lighter
13	Discrete Logic Ignition Switch
14	Switch Backlighting
17	Body Control Module 1
19	Spare
20	Spare
22	Heater, Ventilation, and Air Conditioning/Auxiliary Heater, Ventilation and Air Conditioning Ignition
23	Instrument Cluster Ignition/Sensing Diagnostic Module Ignition
24	Spare
25	Data Link Connector/Driver Seat Module
26	Passive Entry Passive Start/Heater, Ventilation, and Air Conditioning
27	Spare
28	Spare
29	Park Enable/Electrically Adjustable Pedals
30	SEO
31	Accessory/Run Crank
32	Heated Steering Wheel
33	Spare
34	Instrument Cluster
36	Spare
37	Spare
40	Left Doors
41	Driver Power Seat
43	Left Front Heated/Cooled Seat
44	Right Front Heated/Cooled Seats
45	Spare
49	Retained Accessory Power/Accessory
50	Run/Crank

Instrument Panel Fuse Block (Right)

The right instrument panel fuse block access door is on the passenger side edge of the instrument panel.

Number	Usage
1	Accessory Power Outlet 3
2	Accessory Power Outlet 4
7	Body Control Module 4
8	Body Control Module 8
9	Rear Seat Entertainment
10	Cargo Lamp
15	Steering Wheel Controls
18	Radio
19	Spare
20	Sunroof
23	Airbag/Info
26	Export/Power Take Off/SEO Battery 1
27	Obstacle Detection/USB Ports
28	Body Control Module 2
32	SEO Battery 2
35	AC Inverter
36	Amplifier
37	Spare
39	Rear Sliding Window
42	Right Door Window Motor
43	Front Blower
44	SEO
45	Body Control Module 6
46	Body Control Module 7
47	Passenger Seat
50	Retained Accessory Power/Accessory
51	Rear Sliding Window Open
52	Rear Sliding Window Close

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

GMC Sierra (2009 – 2013) – fuse box diagram

Year of production: 2009, 2010, 2011, 2012, 2013

Instrument Panel Fuse Block

The instrument panel fuse block access door is located on the driver’s side edge of the instrument panel.

Fuses	Usage
1	Rear Seats
2	Rear Accessory Power Outlet
3	Steering Wheel Controls Backlight
4	Driver Door Module
5	Dome Lamps, Driver’s Side Turn Signal
6	Driver Side Turn Signal, Stoplamp
7	Instrument Panel Back Lighting
8	Passenger Side Turn Signal, Stoplamp
9	Universal Home Remote
10	Power Door Lock 2 (Unlock Feature)
11	Power Door Lock 2 (Lock Feature)
12	Stoplamps, Center-High Mounted Stoplamp
13	Rear Climate Controls
14	Power Mirror
15	Body Control Module (BCM)
16	Accessory Power Outlets
17	Interior Lamps
18	Power Door Lock 1 (Unlock Feature)
19	Rear Seat Entertainment
20	Ultrasonic Rear Parking Assist
21	Power Door Lock 1 (Lock Feature)
22	Driver Information Center (DIC)
23	Not Used
24	Not Used
25	Driver Seat Module, Remote Keyless Entry System
26	Driver Power Door Lock (Unlock Feature)

 

Circuit Breaker	Usage
LT DR	Driver’s Side Power Window Circuit Breaker

 

Harness Connector	Usage
LT DR	Driver’s Door Harness Connection
BODY	Harness Connector
BODY	Harness Connector

Center Instrument Panel Fuse Block

The center instrument panel fuse block is located underneath the instrument panel, to the left of the steering column.

Harness Connector	Usage
BODY 2	Body Harness Connector 2
BODY 1	Body Harness Connector 1
BODY 3	Body Harness Connector 3
HEADLINER 3	Headliner Harness Connector 3
HEADLINER 2	Headliner Harness Connector 2
HEADLINER 1	Headliner Harness Connector 1
SEO/UPFITTER	Special Equipment Option Upfitter Harness Connector

 

Circuit Breaker	Usage
CB1	Passenger’s Side Power Window Circuit Breaker
CB2	Passenger’s Seat Circuit Breaker
CB3	Driver’s Seat Circuit Breaker
CB4	Rear Sliding Window

Underhood Fuse Block

The underhood fuse block is located in the engine compartment, on the driver’s side of the vehicle.

Fuses	Usage
1	Right Trailer Stop/Turn Lamp
2	Electronic Stability Suspension Control, Automatic Level Control Exhaust
3	Left Trailer Stop/Turn Lamp
4	Engine Controls
5	Engine Control Module, Throttle Control
6	Trailer Brake Controller
7	Front Washer
8	Oxygen Sensors
9	Anti-lock Brakes System 2
10	Trailer Back-up Lamps
11	Driver’s Side Low-Beam Headlamp
12	Engine Control Module (Battery)
13	Fuel Injectors, Ignition Coils (Right Side)
14	Transmission Control Module (Battery)
15	Vehicle Back-up Lamps
16	Passenger’s Side Low-Beam Headlamp
17	Air Conditioning Compressor
18	Oxygen Sensors
19	Transmission Controls (Ignition)
20	Fuel Pump
21	Fuel System Control Module
22	Not Used
23	Not Used
24	Fuel Injectors, Ignition Coils (Left Side)
25	Trailer Park Lamps
26	Driver’s Side Park Lamps
27	Passenger’s Side Park Lamps
28	Fog Lamps
29	Horn
30	Passenger’s Side High-Beam Headlamp
31	Daytime Running Lamps
32	Driver’s Side High-Beam Headlamp
33	Daytime Running Lights 2
34	Sunroof
35	Key Ignition System, Theft Deterrent System
36	Windshield Wiper
37	SEO B2 Upfitter Usage (Battery)
38	Electric Adjustable Pedals
39	Climate Controls (Battery)
40	Airbag System (Ignition)
41	Amplifier
42	Audio System
43	Miscellaneous (Ignition), Cruise Control
44	Not Used
45	Airbag System (Battery)
46	Instrument Panel Cluster
47	Power Take-Off
48	Auxiliary Climate Control (Ignition), Compass-Temperature Mirror
49	Center High-Mounted Stoplamp (CHMSL)
50	Rear Defogger
51	Heated Mirrors
52	SEO B1 Upfitter Usage (Battery)
53	Cigarette Lighter, Auxiliary Power Outlet
54	Automatic Level Control Compressor Relay, SEO Upfitter Usage
55	Climate Controls (Ignition)
56	Engine Control Module, Secondary Fuel Pump (Ignition)

 

J-Case	Usage
57	Cooling Fan 1
58	Nit Used
59	Heavy Duty Anti-lock Brake System
60	Cooling Fan 2
61	Anti-lock Brake System 1
62	Starter
63	Stud 2 (Trailer Brakes)
64	Left Bussed Electrical Center 1
65	Not Used
66	Heated Windshield Washer System
67	Four-Wheel Drive System
68	Stud 1 (Trailer Connector Battery Power) (Optional – 40A Fuse Required)
69	Mid-Bussed Electrical Center 1
70	Climate Control Blower
71	Not Used
72	Left Bussed Electrical Center 2

 

Relays	Usage
FAN HI	Cooling Fan High Speed
FAN LO	Cooling Fan Low Speed
ENG EXH VLV	Not Used
FAN CNTRL	Cooling Fan Control
HDLP LO/HID	Low-Beam Headlamp
FOG LAMP	Front Fog Lamps
A/C CMPRSR	Air Conditioning Compressor
STRTR	Starter
PWR/TRN	Powertrain
FUEL PMP	Fuel Pump
PRK LAMP	Parking Lamps
REAR DEFOG	Rear Defogger
RUN/CRANK	Switched Power

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

GMC Sierra (2008) – fuse box diagram

Year of production: 2008

Instrument Panel Fuse Block

The instrument panel fuse block access door is located on the driver’s side edge of the instrument panel.

Fuses	Usage
1	Rear Seats
2	Rear Accessory Power Outlet
3	Steering Wheel Controls Backlight
4	Driver Door Module
5	Dome Lamps, Driver’s Side Turn Signal
6	Driver Side Turn Signal, Stoplamp
7	Instrument Panel Back Lighting
8	Passenger Side Turn Signal, Stoplamp
9	Universal Home Remote
10	Power Door Lock 2 (Unlock Feature)
11	Power Door Lock 2 (Lock Feature)
12	Stoplamps, Center-High Mounted Stoplamp
13	Rear Climate Controls
14	Power Mirror
15	Body Control Module (BCM)
16	Accessory Power Outlets
17	Interior Lamps
18	Power Door Lock 1 (Unlock Feature)
19	Rear Seat Entertainment
20	Ultrasonic Rear Parking Assist
21	Power Door Lock 1 (Lock Feature)
22	Driver Information Center (DIC)
23	Not Used
24	Not Used
25	Driver Seat Module, Remote Keyless Entry System
26	Driver Power Door Lock (Unlock Feature)

 

Circuit Breaker	Usage
LT DR	Driver’s Side Power Window Circuit Breaker

 

Harness Connector	Usage
LT DR	Driver’s Door Harness Connection
BODY	Harness Connector
BODY	Harness Connector

Center Instrument Panel Fuse Block

The center instrument panel fuse block is located underneath the instrument panel, to the left of the steering column.

Harness Connector	Usage
BODY 2	Body Harness Connector 2
BODY 1	Body Harness Connector 1
BODY 3	Body Harness Connector 3
HEADLINER 3	Headliner Harness Connector 3
HEADLINER 2	Headliner Harness Connector 2
HEADLINER 1	Headliner Harness Connector 1
SEO/UPFITTER	Special Equipment Option Upfitter Harness Connector

 

Circuit Breaker	Usage
CB1	Passenger’s Side Power Window Circuit Breaker
CB2	Passenger’s Seat Circuit Breaker
CB3	Driver’s Seat Circuit Breaker
CB4	Rear Sliding Window

Underhood Fuse Block

The underhood fuse block is located in the engine compartment, on the driver’s side of the vehicle.

Fuses	Usage
1	Right Trailer Stop/Turn Lamp
2	Electronic Stability Suspension Control, Automatic Level Control Exhaust
3	Left Trailer Stop/Turn Lamp
4	Engine Controls
5	Engine Control Module, Throttle Control
6	Trailer Brake Controller
7	Front Washer
8	Oxygen Sensors
9	Anti-lock Brakes System 2
10	Trailer Back-up Lamps
11	Driver’s Side Low-Beam Headlamp
12	Engine Control Module (Battery)
13	Fuel Injectors, Ignition Coils (Right Side)
14	Transmission Control Module (Battery)
15	Vehicle Back-up Lamps
16	Passenger’s Side Low-Beam Headlamp
17	Air Conditioning Compressor
18	Oxygen Sensors
19	Transmission Controls (Ignition)
20	Fuel Pump
21	Fuel System Control Module
22	Not Used
23	Not Used
24	Fuel Injectors, Ignition Coils (Left Side)
25	Trailer Park Lamps
26	Driver’s Side Park Lamps
27	Passenger’s Side Park Lamps
28	Fog Lamps
29	Horn
30	Passenger’s Side High-Beam Headlamp
31	Daytime Running Lamps
32	Driver’s Side High-Beam Headlamp
33	Daytime Running Lights 2
34	Sunroof
35	Key Ignition System, Theft Deterrent System
36	Windshield Wiper
37	SEO B2 Upfitter Usage (Battery)
38	Electric Adjustable Pedals
39	Climate Controls (Battery)
40	Airbag System (Ignition)
41	Amplifier
42	Audio System
43	Miscellaneous (Ignition), Cruise Control
44	Not Used
45	Airbag System (Battery)
46	Instrument Panel Cluster
47	Power Take-Off
48	Auxiliary Climate Control (Ignition), Compass-Temperature Mirror
49	Center High-Mounted Stoplamp (CHMSL)
50	Rear Defogger
51	Heated Mirrors
52	SEO B1 Upfitter Usage (Battery)
53	Cigarette Lighter, Auxiliary Power Outlet
54	Automatic Level Control Compressor Relay, SEO Upfitter Usage
55	Climate Controls (Ignition)
56	Engine Control Module, Secondary Fuel Pump (Ignition)

 

J-Case	Usage
57	Cooling Fan 1
58	Nit Used
59	Heavy Duty Anti-lock Brake System
60	Cooling Fan 2
61	Anti-lock Brake System 1
62	Starter
63	Stud 2 (Trailer Brakes)
64	Left Bussed Electrical Center 1
65	Not Used
66	Heated Windshield Washer System
67	Four-Wheel Drive System
68	Stud 1 (Trailer Connector Battery Power) (Optional – 40A Fuse Required)
69	Mid-Bussed Electrical Center 1
70	Climate Control Blower
72	Not Used
73	Left Bussed Electrical Center 2

 

Relays	Usage
FAN HI	Cooling Fan High Speed
FAN LO	Cooling Fan Low Speed
ENG EXH VLV	Not Used
FAN CNTRL	Cooling Fan Control
HDLP LO/HID	Low-Beam Headlamp
FOG LAMP	Front Fog Lamps
A/C CMPRSR	Air Conditioning Compressor
STRTR	Starter
PWR/TRN	Powertrain
FUEL PMP	Fuel Pump
PRK LAMP	Parking Lamps
REAR DEFOG	Rear Defogger
RUN/CRANK	Switched Power

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

GMC Sierra (2007) – fuse box diagram

Year of production: 2007

Instrument Panel Fuse Block

The instrument panel fuse block access door is located on the driver’s side edge of the instrument panel.

Fuses	Usage
REAR SEAT	Rear Seats
AUX PWR2	Rear Accessory Power Outlet
SWC BKLT	Steering Wheel Controls Backlight
DDM	Driver Door Module
CTSY	Dome Lamps, Driver’s Side Turn Signal
LT STOP TRN	Driver Side Turn Signal, Stoplamp
DIM	Instrument Panel Back Lighting
RT STOP TRN	Passenger Side Turn Signal, Stoplamp
PDM	Passenger Door Module, Universal Home Remote System
UNLCK2	Power Door Lock 2 (Unlock Feature)
LCK2	Power Door Lock 2 (Lock Feature)
STOP LAMPS	Stoplamps, Center-High Mounted Stoplamp
REAR HVAC	Rear Climate Controls
PWR MIR	Power Mirror
BCM	Body Control Module (BCM)
AUX PWR	Accessory Power Outlets
IS LAMPS	Interior Lamps
UNLCK1	Power Door Lock 1 (Unlock Feature)
OBS DET	Ultrasonic Rear Parking Assist
LCK1	Power Door Lock 1 (Lock Feature)
REAR WPR	Not Used
COOLED SEATS	Not Used
DSM	Driver Seat Module, Remote Keyless Entry System
DRV UNLCK	Driver’s Power Door Lock (Unlock Feature)

 

Circuit Breaker	Usage
LT DR	Driver’s Side Power Window Circuit Breaker

 

Harness Connector	Usage
LT DR	Driver’s Door Harness Connection
BODY	Harness Connector
BODY	Harness Connector

Center Instrument Panel Fuse Block

The center instrument panel fuse block is located underneath the instrument panel, to the left of the steering column.

Harness Connector	Usage
BODY 2	Body Harness Connector 2
BODY 1	Body Harness Connector 1
BODY 3	Body Harness Connector 3
HEADLINER 3	Headliner Harness Connector 3
HEADLINER 2	Headliner Harness Connector 2
HEADLINER 1	Headliner Harness Connector 1
BRAKE CLUTCH	Brake Clutch Harness Connector
SEO/UPFITTER	Special Equipment Option Upfitter Harness Connector

 

Circuit Breaker	Usage
CB1	Passenger’s Side Power Window Circuit Breaker
CB2	Passenger’s Seat Circuit Breaker
CB3	Driver’s Seat Circuit Breaker
CB4	Not Used

Underhood Fuse Block

The underhood fuse block is located in the engine compartment, on the driver’s side of the vehicle.

Fuses	Usage
1	Right Trailer Stop/Turn Lamp
2	Not Used
3	Electronic Stability Suspension Control, Automatic Level Control Exhaust
4	Left Trailer Stop/Turn Lamp
5	Engine Controls
6	Engine Control Module, Throttle Control
7	Trailer Brake Controller
8	Front Washer
9	Oxygen Sensors
10	Anti-lock Brakes System 2
11	Trailer Back-up Lamps
12	Driver’s Side Low-Beam Headlamp
13	Engine Control Module (Battery)
14	Fuel Injectors, Ignition Coils (Right Side)
15	Transmission Control Module (Battery)
16	Vehicle Back-up Lamps
17	Passenger’s Side Low-Beam Headlamp
18	Air Conditioning Compressor
19	Oxygen Sensors
20	Transmission Controls (Ignition)
21	Fuel Pump
22	Fuel System Control Module
23	Not Used
24	Not Used
25	Fuel Injectors, Ignition Coils (Left Side)
26	Trailer Park Lamps
27	Driver’s Side Park Lamps
28	Passenger’s Side Park Lamps
29	Fog Lamps
30	Horn
31	Passenger’s Side High-Beam Headlamp
32	Daytime Running Lamps
33	Driver’s Side High-Beam Headlamp
34	Not Used
35	Sunroof
36	Key Ignition System, Theft Deterrent System
37	Windshield Wiper
38	SEO B2 Upfitter Usage (Battery)
39	Electric Adjustable Pedals
40	Climate Controls (Battery)
41	Airbag System (Ignition)
42	Amplifier
43	Audio System
44	Miscellaneous (Ignition), Cruise Control
45	Tailgate Open/Close Assist
46	Airbag System (Battery)
47	OnStar®, Rear Seat Entertainment Display
48	Instrument Panel Cluster
49	Power Take-Off
50	Auxiliary Climate Control (Ignition), Compass-Temperature Mirror
51	Center High-Mounted Stoplamp (CHMSL)
52	Rear Defogger
53	Heated Mirrors
54	SEO B1 Upfitter Usage (Battery)
55	Cigarette Lighter, Auxiliary Power Outlet
56	Automatic Level Control Compressor Relay, SEO Upfitter Usage
57	Climate Controls (Ignition)
58	Engine Control Module, Secondary Fuel Pump (Ignition)

 

J-Case	Usage
59	Cooling Fan 1
60	Automatic Level Control Compressor
61	Heavy Duty Anti-lock Brake System
62	Cooling Fan 2
63	Anti-lock Brake System 1
64	Starter
65	Stud 2 (Trailer Brakes)
66	Left Bussed Electrical Center 1
67	Not Used
68	Heated Windshield Washer System
69	Four-Wheel Drive System
70	Stud 1 (Trailer Connector Battery Power) (Optional – 40A Fuse Required)
71	Mid-Bussed Electrical Center 1
72	Climate Control Blower
73	Tailgate Open/Close Assist
74	Left Bussed Electrical Center 2

 

Relays	Usage
FAN HI	Cooling Fan High Speed
FAN LO	Cooling Fan Low Speed
ENG EXH VLV	Not Used
FAN CNTRL	Cooling Fan Control
HDLP LO/HID	Low-Beam Headlamp
FOG LAMP	Front Fog Lamps
A/C CMPRSR	Air Conditioning Compressor
STRTR	Starter
PWR/TRN	Powertrain
FUEL PMP	Fuel Pump
PRK LAMP	Parking Lamps
REAR DEFOG	Rear Defogger
RUN/CRANK	Switched Power

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

GMC Sierra mk1 (2006) – fuse box diagram

Year of production: 2006

Instrument Panel Fuse Block

The fuse block access door is on the driver’s side edge of the instrument panel.

Fuses	Usage
RR WPR	Not Used
SEO ACCY	Special Equipment Option Accessory
WS WPR	Windshield Wipers
TBC ACCY	Truck Body Controller Accessory
IGN 3	Ignition, Heated Seats
4WD	Four-Wheel Drive System, Auxiliary Battery
HTR A/C	Climate Control System
LOCK (Relay)	Power Door Lock Relay (Lock Function)
HVAC 1	Climate Control System
L DOOR	Driver’s Door Harness Connection
CRUISE	Cruise Control, Power Take Off (PTO)
UNLOCK (Relay)	Power Door Lock Relay (Unlock Function)
RR FOG LP	Not Used
BRAKE	Anti-Lock Brake System
DRIVER UNLOCK	Power Door Lock Relay (Driver’s Door Unlock Function)
IGN 0	TCM
TBC IGN 0	Truck Body Controller
VEH CHMSL	Vehicle and Trailer High Mounted Stoplamp
LT TRLR ST/TRN	Left Turn Signal/Stop Trailer
LT TRN	Left Turn Signals and Sidemarkers
VEH STOP	Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module
RT TRLR ST/TRN	Right Turn Signal/Stop Trailer
RT TRN	Right Turn Signals and Sidemarkers
BODY	Harness Connector
DDM	Driver Door Module
AUX PWR 2	Not Used
LOCKS	Power Door Lock System
ECC	Not Used
TBC 2C	Truck Body Controller
FLASH	Flasher Module
CB LT DOORS	Left Power Windows Circuit Breaker
TBC 2B	Truck Body Controller
TBC 2A	Truck Body Controller

Center Instrument Panel Fuse Block

The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.

Device	Usage
SEO	Special Equipment Option
TRAILER	Trailer Brake Wiring
UPFIT	Upfitter (Not Used)
SL RIDE	Ride Control Harness Connection
HDLR 2	Headliner Wiring Connector
BODY	Body Wiring Connector
DEFOG	Rear Defogger Relay
HDLNR 1	Headliner Wiring Connector 1
SPARE RELAY	Not Used
CB SEAT	Driver and Passenger Seat Module Circuit Breaker
CB RT DOOR	Right Power Windows Circuit Breaker
SPARE	Not Used
INFO	Infotainment Harness Connection

Underhood Fuse Block

The underhood fuse block in the engine compartment on the driver’s side of the vehicle near the battery.

GAS
1	INJ 2
2	INJ 1
3	02A
4	02B
5	ING 1
6	PCMB
DIESEL
1	EDU
2	ACTUATOR
3	FUEL HTR
4	ECM 1
5	ECM
6	ECMB
EXCEPT H2
7	RR HVAC
8	S/ROOF
H2
7	S/ROOF
8

*1 Fuel Injection Rail #2-Gasoline Engine; Engine Control Module-Diesel Engine.
*2 Fuel Injection Rail #1-Gasoline Engine; Actuator-Diesel Engine.
*3 Oxygen Sensors-Gasoline Engine; Fuel Heater-Diesel Engine.
*4 Oxygen Sensors-Gasoline Engine; Engine Control Module 1-Diesel Engine.
*5 Ignition 1-Gasoline Engine; Engine Control Module-Diesel Engine.
*6 Powertrain Control Module B-Gasoline Engine; Engine Control Module B-Diesel Engine.
*7 Rear Climate Control.
*8 Sunroof.

Fuses	Usage
GLOW PLUG	Diesel Glow Plugs and Intake Air Heater
CUST FEED	Gasoline Accessory Power
STUD #1	Auxiliary Power (Single Battery and Diesels Only)/ Dual Battery (TP2) Do not install fuse.
MBEC	Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors
BLOWER	Front Climate Control Fan
LBEC	Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet—Rear Cargo Area and Instrument Panel
STUD 2	Accessory Power/Trailer Wiring Brake Feed
ABS	Anti-Lock Brakes
VSES/ECAS	Vehicle Stability
IGN A	Ignition Power
IGN B	Ignition Power
LBEC 1	Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module
TRL PARK	Parking Lamps Trailer Wiring
RR PARK	Right Rear Parking and Sidemarker Lamps
LR PARK	Left Rear Parking and Sidemarker Lamps
PARK LP	Parking Lamps Relay
STARTER	Starter Relay
INTPARK	Interior Lamps
STOP LP	Stoplamps
TBC BATT	Truck Body Controller Battery Feed
S/ROOF	Sunroof
SEO B2	Off-Road Lamps
4WS	Vent Solenoid Canister/Quadrasteer Module Power
RR HVAC	Not Used
AUX PWR	Auxiliary Power Outlet — Console
IGN 1	Ignition Relay
PCM 1	Powertrain Control Module
ETC/ECM	Electronic Throttle Control, Electronic Brake Controller
IGN E	Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay
RTD	Ride Control
TRL B/U	Backup Lamps Trailer Wiring
PCM B	Powertrain Control Module, Fuel Pump
F/PMP	Fuel Pump (Relay)
B/U LP	Back-up Lamps, Automatic Transmission Shift Lock Control System
RR DEFOG	Rear Window Defogger
HDLP-HI	Headlamp High Beam Relay
PRIME	Not Used
02B	Oxygen Sensors
AIRBAG	Supplemental Inflatable Restraint System
FRT PARK	Front Parking Lamps, Sidemarker Lamps
DRL	Daytime Running Lamps (Relay)
SEO IGN	Rear Defog Relay
TBC IGN1	Truck Body Controller Ignition
HI HDLP-LT	High Beam Headlamp-Left
LH HID	Not Used
DRL	Daytime Running Lamps
RVC	Regulated Voltage Control
IPC/DIC	Instrument Panel Cluster/Driver Information Center
HVAC/ECAS	Climate Control Controller
CIG LTR	Cigarette Lighter
HI HDLP-RT	High Beam Headlamp-Right
HDLP-LOW	Headlamp Low Beam Relay
A/C COMP	Air Conditioning Compressor
A/C COMP	Air Conditioning Compressor Relay
RR WPR	Not Used
RADIO	Audio System
SEO B1	Mid Bussed Electrical Center, Rear Heated Seats, HomeLink
LO HDLP-LT	Headlamp Low Beam-Left
BTSI	Brake Transmission Shift Interlock System
CRANK	Starting System
LO HDLP-RT	Headlamp Low Beam-Right
FOG LP	Fog Lamp Relay
FOG LP	Fog Lamps
HORN	Horn Relay
W/S WASH	Windshield Washer Pump Relay
W/S WASH	Windshield Washer Pump
INFO	OnStar/Rear Seat Entertainment
RADIO AMP	Radio Amplifier
RH HID	Not Used
HORN	Horn
EAP	Not Used
TREC	All-Wheel Drive Module
SBA	Supplemental Brake Assist

Auxiliary Electric Cooling Fan Fuse Block

The auxiliary electric cooling fan fuse block is located in the engine compartment on the driver’s side of the vehicle next to the underhood fuse block.

Fuses	Usage
COOL/FAN	Cooling Fan
COOL/FAN	Cooling Fan Relay Fuse
COOL/FAN	Cooling Fan Fuse

Relays	Usage
COOL/FAN 1	Cooling Fan Relay 1
COOL/FAN 3	Cooling Fan Relay 3
COOL/FAN 2	Cooling Fan Relay 2

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

GMC Sierra mk1 (2005) – fuse box diagram

Year of production: 2005

Instrument Panel Fuse Block

The fuse block access door is on the driver’s side edge of the instrument panel.

Fuses	Usage
RR WPR	Not Used
SEO ACCY	Special Equipment Option Accessory
WS WPR	Windshield Wipers
TBC ACCY	Truck Body Controller Accessory
IGN 3	Ignition, Heated Seats
4WD	Four-Wheel Drive System, Auxiliary Battery
HTR A/C	Climate Control System
LOCK (Relay)	Power Door Lock Relay (Lock Function)
HVAC 1	Climate Control System
L DOOR	Driver’s Door Harness Connection
CRUISE	Cruise Control, Power Take Off (PTO)
UNLOCK (Relay)	Power Door Lock Relay (Unlock Function)
RR FOG LP	Not Used
BRAKE	Anti-Lock Brake System
DRIVER UNLOCK	Power Door Lock Relay (Driver’s Door Unlock Function)
IGN 0	TCM
TBC IGN 0	Truck Body Controller
VEH CHMSL	Vehicle and Trailer High Mounted Stoplamp
LT TRLR ST/TRN	Left Turn Signal/Stop Trailer
LT TRN	Left Turn Signals and Sidemarkers
VEH STOP	Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module
RT TRLR ST/TRN	Right Turn Signal/Stop Trailer
RT TRN	Right Turn Signals and Sidemarkers
BODY	Harness Connector
DDM	Driver Door Module
AUX PWR 2	Not Used
LOCKS	Power Door Lock System
ECC	Not Used
TBC 2C	Truck Body Controller
FLASH	Flasher Module
CB LT DOORS	Left Power Windows Circuit Breaker
TBC 2B	Truck Body Controller
TBC 2A	Truck Body Controller

Center Instrument Panel Fuse Block

The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.

Device	Usage
SEO	Special Equipment Option
TRAILER	Trailer Brake Wiring
UPFIT	Upfitter (Not Used)
SL RIDE	Ride Control Harness Connection
HDLR 2	Headliner Wiring Connector
BODY	Body Wiring Connector
DEFOG	Rear Defogger Relay
HDLNR 1	Headliner Wiring Connector 1
SPARE RELAY	Not Used
CB SEAT	Driver and Passenger Seat Module Circuit Breaker
CB RT DOOR	Right Power Windows Circuit Breaker
SPARE	Not Used
INFO	Infotainment Harness Connection

Underhood Fuse Block

The underhood fuse block in the engine compartment on the driver’s side of the vehicle near the battery.

 

GAS
1	INJ 2	15A
2	INJ 1	15A
3	02A	15A
4	02B	15A
5	ING 1
DIESEL
1	EDU	25A
2	ECMRPV	15A
3	FUEL HT	15A
4	ECM	15A
5	EDU
EXCEPT H2
6	RR HVAC	30A
7	S/ROOF	25A
H2
6	S/ROOF	30A
7

 

*1 — Gasoline Engine and Diesel Engine.
*2 — Gasoline Engine; ECMRPV — Diesel Engine.
*3 — Gasoline Engine; FUEL HT — Diesel Engine.
*4 — Gasoline Engine; ECM I — Diesel Engine.
*5 — IGN/EDU

Fuses	Usage
GLOW PLUG	Diesel Glow Plugs and Intake Air Heater
CUST FEED	Gasoline Accessory Power
STUD #1	Auxiliary Power (Single Battery and Diesels Only)/ Dual Battery (TP2) Do not install fuse.
MBEC	Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors
BLOWER	Front Climate Control Fan
LBEC	Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet—Rear Cargo Area and Instrument Panel
STUD 2	Accessory Power/Trailer Wiring Brake Feed
ABS	Anti-Lock Brakes
VSES/ECAS	Vehicle Stability
IGN A	Ignition Power
IGN B	Ignition Power
LBEC 1	Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module
TRL PARK	Parking Lamps Trailer Wiring
RR PARK	Right Rear Parking and Sidemarker Lamps
LR PARK	Left Rear Parking and Sidemarker Lamps
PARK LP	Parking Lamps Relay
STARTER	Starter Relay
INTPARK	Interior Lamps
STOP LP	Stoplamps
TBC BATT	Truck Body Controller Battery Feed
S/ROOF	Sunroof
SEO B2	Off-Road Lamps
4WS	Vent Solenoid Canister/Quadrasteer Module Power
RR HVAC	Not Used
AUX PWR	Auxiliary Power Outlet — Console
IGN 1	Ignition Relay
PCM 1	Powertrain Control Module
ETC/ECM	Electronic Throttle Control, Electronic Brake Controller
IGN E	Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay
RTD	Ride Control
TRL B/U	Backup Lamps Trailer Wiring
PCM B	Powertrain Control Module, Fuel Pump
F/PMP	Fuel Pump (Relay)
B/U LP	Back-up Lamps, Automatic Transmission Shift Lock Control System
RR DEFOG	Rear Window Defogger
HDLP-HI	Headlamp High Beam Relay
PRIME	Not Used
02B	Oxygen Sensors
AIRBAG	Supplemental Inflatable Restraint System
FRT PARK	Front Parking Lamps, Sidemarker Lamps
DRL	Daytime Running Lamps (Relay)
SEO IGN	Rear Defog Relay
TBC IGN1	Truck Body Controller Ignition
HI HDLP-LT	High Beam Headlamp-Left
LH HID	Not Used
DRL	Daytime Running Lamps
RVC	Regulated Voltage Control
IPC/DIC	Instrument Panel Cluster/Driver Information Center
HVAC/ECAS	Climate Control Controller
CIG LTR	Cigarette Lighter
HI HDLP-RT	High Beam Headlamp-Right
HDLP-LOW	Headlamp Low Beam Relay
A/C COMP	Air Conditioning Compressor
A/C COMP	Air Conditioning Compressor Relay
RR WPR	Not Used
RADIO	Audio System
SEO B1	Mid Bussed Electrical Center, Rear Heated Seats, HomeLink
LO HDLP-LT	Headlamp Low Beam-Left
BTSI	Brake Transmission Shift Interlock System
CRANK	Starting System
LO HDLP-RT	Headlamp Low Beam-Right
FOG LP	Fog Lamp Relay
FOG LP	Fog Lamps
HORN	Horn Relay
W/S WASH	Windshield Washer Pump Relay
W/S WASH	Windshield Washer Pump
INFO	OnStar/Rear Seat Entertainment
RADIO AMP	Radio Amplifier
RH HID	Not Used
HORN	Horn
EAP	Not Used
TREC	All-Wheel Drive Module
SBA	Supplemental Brake Assist

Auxiliary Electric Cooling Fan Fuse Block

The auxiliary electric cooling fan fuse block is located in the engine compartment on the driver’s side of the vehicle next to the underhood fuse block.

Fuses	Usage
COOL/FAN	Cooling Fan
COOL/FAN	Cooling Fan Relay Fuse
COOL/FAN	Cooling Fan Fuse

 

Relays	Usage
COOL/FAN 1	Cooling Fan Relay 1
COOL/FAN 3	Cooling Fan Relay 3
COOL/FAN 2	Cooling Fan Relay 2

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

GMC Sierra mk1 (2003 – 2004) – fuse box diagram

Year of production: 2003, 2004

Instrument Panel Fuse Block

The fuse block access door is on the driver’s side edge of the instrument panel.

Fuses	Usage
RR Wiper	Not Used
SEO ACCY	Special Equipment Option Accessory
WS WPR	Windshield Wipers
TBC ACCY	Truck Body Controller Accessory
IGN 3	Ignition, Heated Seats
4WD	Four-Wheel Drive System, Auxiliary Battery
HTR A/C	Climate Control System
LOCK (Relay)	Power Door Lock Relay (Lock Function)
HVAC 1	Climate Control System
L DOOR	Driver’s Door Harness Connection
CRUISE	Cruise Control, Power Take Off (PTO)
UNLOCK (Relay)	Power Door Lock Relay (Unlock Function)
RR FOG LP	Not Used
BRAKE	Anti-Lock Brake System
DRIVER UNLOCK	Power Door Lock Relay (Driver’s Door Unlock Function)
IGN 0	TCM
TBC IGN 0	Truck Body Controller
VEH CHMSL	Vehicle and Trailer High Mounted Stoplamp
LT TRLR ST/TRN	Left Turn Signal/Stop Trailer
LT TRN	Left Turn Signals and Sidemarkers
VEH STOP	Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module
RT TRLR ST/TRN	Right Turn Signal/Stop Trailer
RT TRN	Right Turn Signals and Sidemarkers
BODY	Harness Connector
DDM	Driver Door Module
AUX PWR 2	Not Used
LOCKS	Power Door Lock System
ECC	Not Used
TBC 2C	Truck Body Controller
FLASH	Flasher Module
CB LT DOORS	Left Power Windows Circuit Breaker
TBC 2B	Truck Body Controller
TBC 2A	Truck Body Controller

Center Instrument Panel Fuse Block

The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.

Device	Usage
SEO	Special Equipment Option
TRAILER	Trailer Brake Wiring
UPFIT	Upfitter (Not Used)
SL RIDE	Ride Control Harness Connection
HDLR 2	Headliner Wiring Connector
BODY	Body Wiring Connector
DEFOG	Rear Defogger Relay
HDLNR 1	Headliner Wiring Connector 1
SPARE RELAY	Not Used
CB SEAT	Driver and Passenger Seat Module Circuit Breaker
CB RT DOOR	Right Power Windows Circuit Breaker
SPARE	Not Used
INFO	Infotainment Harness Connection

Underhood Fuse Block

The underhood fuse block in the engine compartment on the driver’s side of the vehicle near the battery.

*1 — Gasoline Engine and Diesel Engine.
*2 — Gasoline Engine; ECMRPV — Diesel Engine.
*3 — Gasoline Engine; FUEL HT — Diesel Engine.
*4 — Gasoline Engine; ECM I — Diesel Engine.
*5 — IGN/EDU

Fuses	Usage
GLOW PLUG	Diesel Glow Plugs and Intake Air Heater
CUST FEED	Gasoline Accessory Power
STUD #1	Auxiliary Power (Single Battery and Diesels Only)/ Dual Battery (TP2) Do not install fuse.
MBEC	Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors
BLOWER	Front Climate Control Fan
LBEC	Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet—Rear Cargo Area and Instrument Panel
STUD 2	Accessory Power/Trailer Wiring Brake Feed
ABS	Anti-Lock Brakes
VSES/ECAS	Vehicle Stability
IGN A	Ignition Power
IGN B	Ignition Power
LBEC 1	Left Bussed Electrical Center, Left Doors, Truck Body Controller, Flasher Module
TRL PARK	Parking Lamps Trailer Wiring
RR PARK	Right Rear Parking and Sidemarker Lamps
LR PARK	Left Rear Parking and Sidemarker Lamps
PARK LP	Parking Lamps Relay
STARTER	Starter Relay
INTPARK	Interior Lamps
STOP LP	Stoplamps
TBC BATT	Truck Body Controller Battery Feed
SUNROOF	Sunroof
SEO B2	Off-Road Lamps
4WS	Vent Solenoid Canister/Quadrasteer Module Power
RR HVAC	Not Used
AUX PWR	Auxiliary Power Outlet — Console
IGN 1	Ignition Relay
PCM 1	Powertrain Control Module
ETC/ECM	Electronic Throttle Control, Electronic Brake Controller
IGN E	Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay
RTD	Ride Control
TRL B/U	Backup Lamps Trailer Wiring
PCM B	Powertrain Control Module, Fuel Pump
F/PMP	Fuel Pump (Relay)
B/U LP	Back-up Lamps, Automatic Transmission Shift Lock Control System
RR DEFOG	Rear Window Defogger
HDLP-HI	Headlamp High Beam Relay
PRIME	Not Used
02B	Oxygen Sensors
SIR	Supplemental Inflatable Restraint System
FRT PARK	Front Parking Lamps, Sidemarker Lamps
DRL	Daytime Running Lamps (Relay)
SEO IGN	Rear Defog Relay
TBC IGN1	Truck Body Controller Ignition
HI HDLP-LT	High Beam Headlamp-Left
LH HID	Not Used
DRL	Daytime Running Lamps
IPC/DIC	Instrument Panel Cluster/Driver Information Center
HVAC/ECAS	Climate Control Controller
CIG LTR	Cigarette Lighter
HI HDLP-RT	High Beam Headlamp-Right
HDLP-LOW	Headlamp Low Beam Relay
A/C COMP	Air Conditioning Compressor
A/C COMP	Air Conditioning Compressor Relay
RR WPR	Not Used
RADIO	Audio System
SEO B1	Mid Bussed Electrical Center, Rear Heated Seats, HomeLink
LO HDLP-LT	Headlamp Low Beam-Left
BTSI	Brake Transmission Shift Interlock System
CRANK	Starting System
LO HDLP-RT	Headlamp Low Beam-Right
FOG LP	Fog Lamp Relay
FOG LP	Fog Lamps
HORN	Horn Relay
W/S WASH	Windshield Washer Pump Relay
W/S WASH	Windshield Washer Pump
INFO	OnStar/Rear Seat Entertainment
RADIO AMP	Radio Amplifier
RH HID	Not Used
HORN	Horn
EAP	Not Used
TREC	All-Wheel Drive Module
SBA	Supplemental Brake Assist

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

GMC Sierra mk1 (2001 – 2002) – fuse box diagram

Year of production: 2001, 2002

Instrument Panel Fuse Block

The fuse block access door is on the driver’s side edge of the instrument panel. Pull off the cover to access the fuse block.

Name	Usage
L BODY	Retained Accessory Power Relay
LOCK	Power Door Locks
DRV UNLOCK	Power Door Lock Relay
LOCK	Power Door Lock Relay
HVAC 1	Climate Control System
CRUISE	Cruise Control, Instrument Panel Cluster
IGN 3	Ignition, Power Seats
4WD	Four-Wheel Drive System, Auxiliary Battery
CRANK	Starting System
INT PRK	Parking Lamps, Sidemarker Lamps, Interior Lamps
L DOOR	Power Door Lock Relay
BRAKE	Anti-Lock Brake System
RR WIPER	Not Used
ILLUM	Interior Lamps
SEAT	Power Seat Circuit Breaker
TURN	Exterior Lamps, Turn Signals, Hazard Lamps
UNLOCK	Power Door Locks
HTR A/C	Climate Control System
WS WPR	Windshield Wipers
IGN 1	Ignition, Instrument Panel
AIR BAG	Air Bag
MIR/LOCK	Power Mirrors, Power Door Locks
DR LOCK	Power Door Locks
PWR WDO	Power Window Circuit Breaker
UNLOCK	Power Door Lock Relay
IGN 0	PRND321 Display, Odometer, PCM
SEO IGN	Special Equipment Option, Ignition, Manual Selectable Ride
SEO ACCY	Special Equipment Option Accessory, Cellular Telephone
RAP #1	Retained Accessory Power Relay
RDO 1	Audio System
RAP #2	Not Used

Center Instrument Panel Utility Block

The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.

Name	Usage
SEO	Special Equipment Option
HTD ST	Heated Seats
SPARE 4	Not Used
VANITY	Headliner Wiring
TRAILER	Trailer Brake Wiring
PWR ST	Power Seats
SPARE 5	Not Used
CLUTCH	Manual Transmission Clutch Switch
UPF	Upfitter
PARK LAMP	Parking Lamps (Relay)
FRT PRK EXPT	Not Used (Fuse)
SL RIDE	Manual Selectable Ride Switch
SPARE 2	Not Used
RR PRK LP	Not Used (Relay)
RR FOG LP	Not Used (Relay)
SPARE 3	Not Used
INADV PWR	Interior Lights Feed
CTSY LP	Courtesy Lamps
CEL PHONE	Cellular Telephone Wiring

Underhood Electrical Center

The underhood electrical center is located on the driver’s side of the engine compartment near the battery.

*1 INJ B–Gasoline Engine and Diesel Engine.
*2 ECM I–Gasoline Engine; ECMRPV–Diesel Engine.
*3 02 A–Gasoline Engine; FUEL HT–Diesel Engine.
*4 02 B–Gasoline Engine; ECM I–Diesel Engine.

Name	Usage
GLOW PLUG	Diesel Glow Plugs and Intake Air Heater
CUST FEED	Gasoline Accessory Power
STUD #1	Accessory Power/Trailer Wiring Feed
ABS	Anti-Lock Brakes
IGN A	Ignition Switch
AIR	A.I.R. System
RAP #1	Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s)
IGN B	Ignition Switch
RAP #2	Not Used
STUD #2	Accessory Power/Trailer Wiring Brake Feed
SPARE	Spare Fuse
TRL R TRN	Right Turn Signal Trailer Wiring
TRL L TRN	Left Turn Signal Trailer Wiring
IGN 1	Ignition, Fuel Controls (Relay)
INJ B	Ignition, Fuel Controls
STARTER	Starter (Relay)
PARK LP	Parking Lamps
FRT HVAC	Climate Control System
STOP LP	Exterior Lamps, Stoplamps
ECM I	PCM
ECMRPV	Fuel Controls, ECM
CHMSL	Center High Mounted Stoplamp
VEH STOP	Stoplamps, Cruise Control
TRL B/U	Backup Lamps Trailer Wiring
INJ A	Fuel Controls, Ignition
RR HVAC	Not Used
VEH B/U	Vehicle Backup Lamps
ENG 1	Engine Controls, Canister Purge, Fuel System
ETC	Electronic Throttle Control
IGN E	A/C Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. System
B/U LP	Backup Lamps, Automatic Transmission Shift Lock Control System
ATC	Automatic Transfer Case
RR DEFOG	Rear Window Defogger, Heated Mirrors (Relay)
RR PRK	Right Rear Parking Lamps
ECM B	PCM
F/PMP	Fuel Pump (Relay)
O2 A	Oxygen Sensors
FUEL HT	Fuel Heater, Glow Plug and Intake Heater Controls
O2 B	Oxygen Sensors
LR PRK	Left Rear Parking Lamps
RR DEFOG	Rear Window Defogger, Heated Mirrors
HDLP	Headlamps (Relay)
TRL PRK	Parking Lamps Trailer Wiring
RT HDLP	Right Headlamps
DRL	Daytime Running Lamps (Relay)
HTD MIR	Heated Mirrors
LT HDLP	Left Headlamps
A/C	Air Conditioning
AUX PWR	Cigarette Lighter, Auxiliary Power Outlets
SEO 2	Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp
SEO 1	Special Equipment Option Power, Aux Roof Mnt Lamp, Cell Phone, OnStar
DRL	Daytime Running Lamps
A/C	A/C (Relay)
FOG LP	Fog Lamps
FOG LP	Fog Lamps (Relay)
RADIO	Audio System, Instrument Cluster, Climate Control System
CIGAR	Cigarette Lighter, Auxiliary Power Outlets
RT TURN	Right Turn Signals
BTSI	Automatic Transmission Shift Lock Control System
LT TURN	Left Turn Signals
FR PRK	Front Parking Lamps, Sidemarker Lamps
W/W PMP	Windshield Washer Pump
HORN	Horn (Relay)
IGN C	Ignition Switch, Fuel Pump, PRND321 Display, Crank
RDO AMP	Not Used
HAZ LP	Exterior Lamps, Hazard Lamps
EXP LPS	Not Used
HORN	Horn
CTSY LP	Interior Lamps
RR WPR	Not Used
TBC	Body Control Module, Remote Keyless Entry, Headlamps

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.