Electrical System
The vehicle has fuses to protect against an electrical system overload. Fuses also protect power devices in the vehicle.
Replace a bad fuse with a new one of the identical size and rating.
If there is a problem on the road and a fuse needs to be replaced, there are some spare fuses and a fuse puller in the left instrument panel fuse block. The same amperage fuse can also be borrowed. Choose some feature of the vehicle that is not needed to use and replace it as soon as possible.
An electrical overload may cause the lamps to go on and off, or in some cases to remain off. Have the headlamp wiring checked right away if the lamps go on and off or
remain off.
If the wiper motor overheats due to heavy snow or ice, the windshield wipers will stop until the motor cools and will then restart.
Although the circuit is protected from electrical overload, overload due to heavy snow or ice may cause wiper linkage damage.
Always clear ice and heavy snow from the windshield before using the windshield wipers.
If the overload is caused by an electrical problem and not snow or ice, be sure to get it fixed.
The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of damage caused by electrical problems.
To check a fuse, look at the
silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure to replace a bad fuse with a new one of the identical size and rating.
Fuses of the same amperage can be temporarily borrowed from another fuse location, if a fuse goes out. Replace the fuse as soon as possible.
If the vehicle has a diesel engine, see the Duramax diesel supplement.
The engine compartment fuse block is in the engine compartment, on the driver side of the vehicle.
Lift the cover to access the fuse block.
A fuse puller is available in the left instrument panel fuse block.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
Fuses Usage
1 Trailer brake
Fuses Usage
2 Trailer battery
Fuses Usage
Fuses Usage
Fuses Usage
high-mounted stoplamp
Fuses Usage
Fuses Usage
74 Electric running boards
79 Vacuum pump
Relays Usage
Relays Usage
75 Fuel pump prime/ MGU motor
78 Vacuum pump switch
The right instrument panel fuse block access door is on the passenger side edge of the instrument panel.
Pull off the cover to access the fuse block.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
Fuses Usage
1 Accessory power outlet 3
Fuses Usage
2 Accessory power outlet 4
15 Steering wheel controls
18 Radio
19 –
20 Sunroof
23 Airbag/Info
32 Special equipment option/Battery 2
Fuses Usage
39 Rear sliding window
Relays Usage
The left instrument panel fuse block access door is on the driver side edge of the instrument panel.
Pull off the cover to access the fuse block.
The vehicle may not be equipped with all of the fuses, relays, and features shown.
Fuses Usage
Fuses Usage
9 –
17 Body control module 1
Fuses Usage
19 –
20 –
24 –
27 –
28 –
Fuses Usage
34 Instrument cluster
36 –
37 –
38 4WD transfer case electronic control
45 –
Relays Usage
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