The rear underseat fuse block is located on the driver side of the vehicle, under the second row seat. Pull the seat cushion forward to access the fuse block.
| Fuse No. | Function |
|---|
| 1 | Passenger door control module |
| 2 | Driver door control module |
| 3 | Liftage module 2 |
| 4 | Truck body controller 3 |
| 5 | - |
| 6 | - |
| 7 | Truck body controller 2 |
| 8 | Power seats |
| 9 | Rear wiper |
| 10 | Driver door module |
| 11 | Amplifiler |
| 12 | Passenger door module |
| 13 | - |
| 14 | Driver side rear parking lamps |
| 15 | - |
| 16 | Vehicle center high-mounted stoplamp |
| 17 | Passenger side rear parking lamps |
| 18 | Locks |
| 19 | Liftage module/Driver seat module |
| 20 | - |
| 21 | Locks |
| 22 | - |
| 23 | - |
| 24 | Unlock |
| 25 | Ignition 0 |
| 26 | Overhead battery/Onstar system |
| 27 | Rainsense wipers |
| 28 | Sunroof |
| 29 | Accessory |
| 30 | Parking lamps |
| 31 | Truck body controller accessory |
| 32 | Truck body controller |
| 33 | Front wipers |
| 34 | Ignition 3 |
| 35 | Vehicle stop |
| 36 | Transmission control module |
| 37 | Heat ventilation air conditioning B |
| 38 | Front parking lamps |
| 39 | Rear left turn signal |
| 40 | Heat, ventilation, AC 1 |
| 41 | Front right turn signal |
| 42 | Radio |
| 43 | Trailer park |
| 44 | Rear right turn signal |
| 45 | - |
| 46 | Auxiliary power 1 |
| 47 | - |
| 48 | Ignition 0 |
| 49 | Four wheel drive |
| 50 | - |
| 51 | Front left turn signal |
| 52 | Brakes |
| 53 | Truck body controller |