| 1 | — | Powertrain Control Module (PCM) diode |
| 2 | — | Alternative Fuel Control Module (AFCM) diode (Natural gas vehicle only) |
| 3 | — | Daytime Running Lamps (DRL) module, A/C clutch |
| 4 | — | Natural Gas Vehicle (NGV) tank solenoids (natural gas vehicle only) |
| 5 | — | Horn relay |
| 6 | — | Brake pressure switch |
| 7 | — | Ignition switch, Fuse panel, Accessory delay |
| 8 | — | Trailer battery charge relay |
| 9 | — | Modified vehicle power |
| 10 | — | Electric brake controller |
| 11 | — | 4-Wheel Anti-lock Brake System (4WABS) |
| 12 | — | I/P fuses 29, 34, 35, 40 and 41 |
| 13 | — | Fuel pump relay (P0087, P0230, P0231, P0232) |
| 14 | — | Auxiliary blower relay |
| 15 | — | Main light switch |
| 17 | — | Blower motor relay (blower motor) |
| 18 | — | Engine compartment fuses 3, 5, 23 and 26, Instrument panel fuses 26 and 32, Diesel start relay (Diesel engine only |
| 19 | — | IDM relay (Diesel engine only) |
| 20 | — | Auxiliary battery relay (gasoline engine only), PDB fuses 8 and 24 (Diesel engine only) |
| 21 | — | PCM power relay, PDB fuse 27 |
| 22 | — | I/P fuses 4, 5, 10, 11, 16, 17, 22 and 23 |
| 23 | — | Alternator |
| 24 | — | Trailer tow running lamps and back-up lamp relays |
| 26 | — | Trailer tow turn signals |
| 27 | — | PCM |
| A | — | Fuel pump relay (P0087, P0230, P0231, P0232) |
| B | — | Horn relay |
| C | — | Trailer back-up lamps relay |
| D | — | Trailer running lamps relay |
| E | — | Trailer battery charge relay |
| F | — | IDM relay (Diesel only) |
| G | — | PCM relay (P0685, P0686, P0687, P0688) |
| H | — | Blower motor relay |
| J | — | Accessory delay relay |
| K | — | Start relay (Diesel only) |