Jonathan Yarden Mar 25, 2021 · 5 min. read
In this article you will find a description of fuses and relays GMC,
with photos of block diagrams and their locations.
Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.
Year of production: 1998, 1999, 2000
Instrument Panel Fuse Block
The instrument panel fuse block is at the driverâs end of the instrument panel.
Fuse/Circuit Breaker | Usage |
A | Not Used |
B | Not Used |
1 | Not Used |
2 | Cigarette Lighter, Data Link Connector |
3 | Cruise Control Module and Switch, Body Control Module, Heated Seats |
4 | Gages, Body Control Module, Instrument Panel Cluster |
5 | Parking Lamps, Power Window Switch, Body Control Module, Ashtray Lamp |
6 | Steering Wheel Audio Control Illumination |
7 | Headlamp Switch, Body Control Module, Headlamp Relay |
8 | Courtesy Lamps, Battery Run-Down Protection |
9 | Not Used |
10 | Turn Signal |
11 | Cluster, Engine Control Module |
12 | Interior Lights |
13 | Auxiliary Power |
14 | Power Locks Motor |
15 | 4WD Switch, Engine Controls (VCM, PCM, Transmission) |
16 | Air Bag |
17 | Front Wiper |
18 | Steering Wheel Audio Controls |
19 | Radio, Battery |
20 | Amplifier |
21 | HVAC I (Automatic), HVAC Sensors (Automatic) |
22 | Anti-Lock Brakes |
23 | Rear Wiper |
24 | Radio, Ignition |
Engine Compartment Fuse Block
The fuse block is under the hood at the driverâs side of the engine compartment.
Name | Usage |
TRL TRN | Trailer Left Turn |
TRR TRN | Trailer Right Turn |
TRL B/U | Trailer Back-Up Lamps |
VEH B/U | Vehicle Back-Up Lamps |
RT TURN | Right Turn Signal Front |
LT TURN | Left Turn Signal Front |
LT TRN | Left Turn Signal Rear |
RT TRN | Right Turn Signal Rear |
RR PRK | Right Rear Parking Lamps |
TRL PRK | Trailer Park Lamps |
LT LOW | Low-Beam Headlamp, Left |
RT LOW | Low-Beam Headlamp, Right |
FRPRK | Front Parking Lamps |
INT BAT | I/P Fuse Block Feed |
ENG I | Engine Sensors/Solenoids, MAF, CAM, PURGE, VENT |
ECM B | Engine Control Module, Fuel Pump, Module, Oil Pressure |
ABS | Anti-Lock Brake System |
ECM I | Engine Control Module Injectors |
A/C | Air Conditioning |
LT HI | High-Beam Headlamp, Left |
RT HI | High-Beam Headlamp, Right |
HORN | Horn |
BTSI | Brake-Transmission Shift Interlock |
B/U LP | Back-Up Lamps |
DRL | Daytime Running Lamps (If Equipped) |
IGN B | Column Feed, IGN 2, 3, 4 |
RAP | Retained Accessory Power |
LD LEV | Electronic Load Leveling |
OXYSEN | Oxygen Sensor |
MIR/LKS | Mirrors, Door Locks |
FOG LP | Fog Lamps |
IGN E | Engine |
IGN A | Starting and Charging, IGN 1 |
STUD #2 | Accessory Feeds, Electric Brake |
PARKLP | Parking Lamps |
LR PRK | Left Rear Parking Lamps |
IGN C | Starter Solenoid, Fuel Pump, PRNDL |
HTDSEAT | Heated Seats |
HVAC | HVAC System |
TRCHMSL | Trailer Center High-Mounted Stop Light |
HIBEAM | High-Beam Headlamps |
RRDFOG | Rear Defogger |
TBC | Truck Body Computer |
CRANK | Clutch Switch, NSBU Switch |
HAZLP | Hazard Lamps |
VECHMSL | Vehicle Center High-Mounted Stop Lamp |
HTDMIR | Heated Mirror |
ATC | Automatic Transfer Case |
STOPLP | Stoplamps |
RR W/W | Rear Window Wiper |
WARNING:Â Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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