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Maintenance Information: Component Locations GMC C3500 HD

Procedures 3 illustrations ~821 words

VIN LOCATION

The Vehicle Identification Number (VIN) is located on the left side of the dash panel at the base of the windshield. The VIN chart explains the code characters.

FUSE PANEL LOCATION

The fuse block is located behind a cover in the dash to the left of the steering column.

Scheme 7

Scheme 7: FUSE PANEL IDENTIFICATION
Scheme 7: FUSE PANEL IDENTIFICATION

Fuse & Circuit Breaker Identification

  1. 1 - Stop/Haz 20 Amp (Yellow) Stop/TCC Switch, Hazard Flasher, Seat Belt Reminder, Stoplights, CHMSL (Center High Mounted Stop Light)
  2. 2 - T Case (Not Used) Transfer Case
  3. 3 - CTSY 20 Amp (Yellow) Courtesy Lamps, Cargo Lamp, Glove Box Light, Power Mirrors, Dome/Reading Lamps, Vanity Mirrors
  4. 4 - Gauges 10 Amp (Red) DRL Relay, DRL Module Buzzer, Headlamp Switch, Keyless Entry, Cluster/Gauges, Low Coolant Module, Convenience Center Electrochromatic Rearview Mirror with Compass
  5. 5 - RR HVAC 10 Amp (Red) RR HVAC Controls
  6. 6 - Cruise 10 Amp (Red) Cruise Module, Cruise Activator Switch
  7. 7 - AUX PWR 25 Amp (Clear) Power Outlets (2)
  8. 8 - Crank 10 Amp (Red) Diesel Fuel Pump, DERM ECM (Air Bag), PCM
  9. 9 - Park Lamps 20 Amp (Yellow) License Plate Light, Park Lamps, Tail Lamps, Ashtray Lamp, Door Switch Illumination, Headlight ON Warning, Side Marker Fog Lamp Relay, Clearance Lights, Heater & A/C Illumination
  10. 10 - Air Bag 10 Amp (Red) DERM (Air Bag)
  11. 11 - Wiper 25 Amp (Clear) Windshield Washer/Wiper
  12. 12 - HTR-A/C 25 Amp (Clear) L, M1, M2 Blower, HVAC Indicator Lamp, A/C Compressor, Mode/Temp/Air In Actuator, High Blower Relay, Transfer Case
  13. 13 - CIG LTR 20 Amp (Yellow) Cigar Lighter, Power Amplifier, Door Lock Relay, Power Lumbar Seat, Rear Lift Glass
  14. 14 - ILLUM 10 Amp (Red) 4WD Indicator Lamp, Cluster, HVAC Controls, Chime Module, Radio Illumination, Instrument Panel Switches, RR HVAC Controls
  15. 15 - DRL-FOG 20 Amp (Yellow) DRL Relay, Fog Lamps
  16. 16 - Turn B/U 20 Amp (Yellow) Front Turn, RR Turn, Trailer Turn, Back-up Lamps, BTSI (Brake/Transmission Shift Interlock) Solenoid
  17. 17 - Radio 10 Amp (Red) Radio (IGN)
  18. 18 - Brake 10 Amp (Red) DRAC, 4WAL/PCM, ABS, Cruise
  19. 19 - Radio 10 Amp (Red) Radio (BATT)
  20. 20 - Acc/Ign 10 Amp (Red) PRNDL, Auto Transmission, Speedometer, Check Gauges, Tell Tale
  21. 21 - Not Used
  22. 22 - Not Used
  23. 23 - Not Used
  24. 24 - 4WD 25 Amp (Clear) 4X4 Models Front Axle Actuator, 4WD Indicator Lamp, TP2 Relay, Hour Meter (7Y4 Option)
  25. A - PWR ACCY 20 Amp - C/K Reg. & Ext. Cab (Circuit Breaker) Power Door Lock, 6 Way Power Seat, Keyless Entry Module 30 Amp - C/K Crew Cab (Circuit Breaker) Power Door Lock, 6 Way Power Seat, Keyless Entry Module
  26. B - PWR WDOS 20 Amp - C/K Reg. & Ext. Cab (Circuit Breaker) Power Windows 30 Amp - C/K Crew Cab (Circuit Breaker) Power Windows

Scheme 8

Scheme 8: UNDERHOOD POWER DISTRIBUTION ID
Scheme 8: UNDERHOOD POWER DISTRIBUTION ID
WARNINGAlways disconnect battery ground cable before servicing "high-current" fuses. It is recommended that "high-current" fuses be replaced by a qualified technician.

Fuse & Relay Identification

  1. 1 - Spare
  2. 2 - STOP 30 Amp Maxifuse (Green) Stop Lamps
  3. 3 - A/C 50 Amp Maxifuse (Red) High Blower Relay, Rear Blower Relay
  4. 4 - ABS 60 Amp Maxifuse (Blue) ABS Module
  5. 5 - IGN B 50 Amp Maxifuse (Red) 50 Amp IGN B Switch, Go To Fuse Block Busbar
  6. 6 - IGN A 40 Amp Maxifuse (Amber) IGN A Switch, Go To Fuse Block Bus Bar
  7. 7 - BATTERY 50 Amp Maxifuse (Red) Battery, Fuse Block Bus Bar
  8. 8 - LIGHTING 50 Amp Maxifuse (Red) Headlamp & Panel Dimmer Switch, Fog Lights, Courtesy Lights
  9. 9 - 30 Amp (Green)
  10. 10 - 30 Amp (Green)
  11. 11 - 10 Amp (Red) Spare
  12. 12 - 20 Amp (Yellow) Spare
  13. 13 - 30 Amp (Green) Spare
  14. 14 - Not Used
  15. 15 - A/C COMP 10 Amp (Red) SW A/C Pressure to A/C Clutch
  16. 16 - HORN 20 Amp (Yellow) Horn, Underhood Lamps
  17. 17 - ECM B 20 Amp (Yellow) Fuel Pump, PCM
  18. 18 - Not Used
  19. 19 - AUX FAN 30 Amp (Green) Aux. Fan
  20. 20 - RR- DEFOG 30 Amp (Green) RR DEFOG
  21. 21 - ENG 1 20 Amp (Yellow) IGN A Switch to Engine Loads, EGR, Canister Purge EVRV Idle Coast Solenoid, Heated O2 Sensor, Fuel Heater, Water Sensor
  22. 22 - ECM 1 20 Amp (Yellow) Injector #1, Injector #2, PCM
  23. 23 - FUEL SOL 20 Amp (Yellow) Fuel Solenoid (Diesel Engine Only)
  24. 24 - Not Used
  25. 25 - Not Used
  26. 26 - IGN E 10 Amp (Red) Aux Fan Relay Coil, Hot Fuel Module
  27. 27 - Not Used
  28. 28 - Not Used
  29. 29 - GLOW PLUGS 10 Amp (Red) Glow Plugs (Diesel Engine Only)
  30. 30 - Not Used
  31. 31 - Not Used
  32. 32 - Not Used
  33. A - 30 Amp
  34. B - 30 Amp UY1, UY7 Camper/Trailer Wiring
  35. C - Brake Lamp Relay
  36. D - Horn Relay
  37. E - Auxiliary Fan Relay
  38. F - A/C Relay
  39. G - Fuel Pump Relay

Scheme 9

Scheme 9: CONVENIENCE CENTER IDENTIFICATION
Scheme 9: CONVENIENCE CENTER IDENTIFICATION

Fuse & Circuit Breaker Identification

  1. A - Fog Lamp Relay
  2. B - DRL (Daytime Running Lights) Relay
  3. C - Hazard Flasher
  4. D - Chime

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