When a circuit goes out, the problem could be in either the primary or secondary underhood fuse blocks. These blocks use blade-type fuses.
Both underhood fuse blocks are located in the engine compartment, on the passenger's side of the vehicle.
To access the fuse blocks, gently squeeze both sides of the cover to unlatch the tabs at the top. Then, unsnap both attachments at the bottom and remove the cover.
Be sure to replace fuses with fuses of the same rating. Do not use fuses of higher amperage than those indicated on the fuse block.
Primary Underhood Fuse Block
Fuse | Usage |
|---|---|
RR DEFOG | Rear Defog |
ENG 1 | Engine 1 |
ENG 3 | Engine 3 |
PCM-B | Powertrain Control Module |
BLANK | Empty |
ENG 4 | Engine 4 |
ENG 2 | Engine 2 |
HTD FUEL | Heated Fuel |
BLANK | Empty |
BLANK | Empty |
BLANK | Empty |
A/C COMP | Air Conditioning Compressor |
ABS 1 | Anti-Lock Brake System 1 |
ABS 2 | Anti-Lock Brake System 2 |
ABS 3 | Anti-Lock Brake System 3 |
ENGINE | Engine |
E/A PUMP | Electronic/Automatic Pump |
HORN | Horn |
NOTE 2 | L18 Fuel, LG4 Powertrain Control Valve, LG5 Electronic Control Module |
BLANK | Empty |
STUD A | Spare |
STUD B | Spare |
Relay | Usage |
|---|---|
NOTE 1 | LG4 Powertrain Control Valve, L18 Fuel Pump, LG5 Heated Fuel |
IGN B | Ignition |
STARTER | Starter |
HORN | Horn |
IGN A | Ignition |
PTO/ECU* | Power Take-Off/Engine Control Unit Diesel 7.8L DURAMAX™ |
REVERSE | Reverse |
NEUTRAL START | Neutral Start |
Secondary Underhood Fuse Block
Fuse | Usage |
|---|---|
IGN 1 | Four-Wheel Drive Module |
IGN 4 | Ignition 4 |
IGN 3 | Ignition 3 |
BATT/HAZ | Battery/Hazard Warning Flashers |
HEADLAMP | Headlamps |
LIGHTING | Interior/Exterior Lamps |
HVAC | Comfort Control System |
NOTE | C4/C5 Electric Brake, C6/C7/C8 Brake Lamps |
