GMC Forward Control P3500 1993 - ELECTRICAL COMPONENT LOCATOR 1993 ELECTRICAL COMPONENT LOCATIONS General Motors Corp. - Electrical Components

GMC Forward Control P3500 1993 - BUZZERS, RELAYS & TIMERS

GMC Forward Control P3500 1993 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
A/C-Heater Blower Relay	On evaporator case, in engine compartment.
Auxiliary Cooling Fan Relay ("G" Series)	On center of firewall.
Auxiliary Power Relay	Behind left "B" pillar.
Brake/Transmission Shift Interlock Relay ("G" Series)	On steering column.
Brake Warning Alarm Buzzer	Behind left side of dash.
Cold Advance Glow Plug Inhibit Relay ("P" Series 7.4L VIN N)	On right side of firewall. See Fig. 1.
Daytime Running Lights (DRL) Relay	Behind left side of dash.
Fuel Pump Relay
"G" Series 4.3L (VIN Z)	On center of firewall. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On center of firewall. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On center of firewall. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On center of firewall. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On center of firewall. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On center of firewall. See Fig. 7.
"G" Series 5.7L (VIN K)	On center of firewall. See Fig. 8.
"G" Series 7.4L (VIN N)	On center of firewall. See Fig. 9.
"G" Series 7.4L (VIN N)	On center of firewall. See Fig. 10.
"P" Series 7.4L (VIN N)	On center of firewall. See Fig. 1.
"G" & "P" Series 6.2L (Diesel)	On center of firewall. See Fig. 11.
Hazard Flasher
"G" Series	Near fuse block.
"P" Series	Behind left side of dash, above steering column.
Horn Relay	Near fuse block.
Power Antenna Relay	On right side of steering column, behind dash.
Power Door Lock Delay Relay	Behind left side of dash, above kick panel.
Power Door Lock Relay	Behind left side of dash, above kick panel.
Rear Defogger Relay	On brake pedal support bracket.
Turn Signal Flasher	On fuse block.

GMC Forward Control P3500 1993 - CIRCUIT PROTECTION DEVICES

GMC Forward Control P3500 1993 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Circuit Breakers
Power Accessory	On fuse block.
Power Window	On fuse block.
Fuse Block
"G" Series 4.3L (VIN Z)	Behind left side of dash, above kick panel. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	Behind left side of dash, above kick panel. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	Behind left side of dash, above kick panel. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	Behind left side of dash, above kick panel. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	Behind left side of dash, above kick panel. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	Behind left side of dash, above kick panel. See Fig. 7.
"G" Series 5.7L (VIN K)	Behind left side of dash, above kick panel. See Fig. 8.
"G" Series 7.4L (VIN N)	Behind left side of dash, above kick panel. See Fig. 9.
"G" Series 7.4L (VIN N)	Behind left side of dash, above kick panel. See Fig. 10.
"P" Series 7.4L (VIN N)	Behind left side of dash, above kick panel. See Fig. 1.
Fusible Links
ABS Pump Motor (Rust)	At battery junction block
A/C Heater (Rust)	At battery junction block (rear unit).
Alternator (Rust)	At battery junction block.
Auxiliary Cooling Fan Relay (Rust)	At battery junction block.
Glow Plug Controller (Rust)	At battery junction block.
Ignition Switch (Rust)	At battery junction block (2 links).
Power Accessories (Rust)	At battery junction block.
In-Line Fuse (Trailer)	At battery junction block.

GMC Forward Control P3500 1993 - CONTROL UNITS

GMC Forward Control P3500 1993 CONTROL UNITS LOCATION

Component	Location
ABS Module
Rear Wheel ABS	On left side of engine compartment.
4-Wheel ABS	Under right side of vehicle, on frame rail.
Audio Alarm Module	Behind dash, below fuse block.
Brake Booster Delay Module ("P" Series)	Behind left side of dash, on parking brake support bracket.
Coolant Level Indicator Module	Behind left side of dash.
Cruise Control Module	On top of rear parking brake bracket.
Daytime Running Lights (DRL) Module	Behind left side of dash, above steering column.
Diode Array Module	Behind left side of dash, in dash harness.
Electronic Delay Module	Behind left side of dash.
Glow Plug Controller
"G" Series	On left side of engine.
"P" Series	On top rear of engine.
Hot Fuel Handling Module
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	Under driver's seat. See Fig. 5.
"G" Series 7.4L (VIN N)	Under driver's seat. See Fig. 9.
"G" Series 5.7L (VIN K)	On left "B" pillar. See Fig. 8.
"G" Series 7.4L (VIN N)	On left "B" pillar. See Fig. 10.
"P" Series 4.3L (VIN Z - A/T)	Behind left side of shipping panel. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	Behind left side of shipping panel. See Fig. 4.
"P" Series 7.4L (VIN N)	Behind left side of shipping panel. See Fig. 1.
Keyless Entry Module	Behind right side of dash.
Knock Sensor Module
"P" Series 4.3L (VIN Z - M/T)	On top right of engine, on valve cover. See Fig. 4.
"P" Series 5.7L (VIN K - M/T)	On top right of engine, on valve cover. See Fig. 7.
Power Door Lock Delay Module	Behind dash, to right of steering column.
Powertrain Control Module (PCM)
"G" Series 4.3L (VIN Z)	Under driver's seat. See Fig. 2.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	Under driver's seat. See Fig. 5.
"G" Series 7.4L (VIN N)	Under driver's seat. See Fig. 9.
"G" & "P" Series 6.2L (Diesel)	Under driver's seat. See Fig. 11.
"G" Series 5.7L (VIN K)	On left "B" Pillar.
"G" Series 7.4L (VIN N)	On left "B" Pillar.
Diesel "G" & "P" Series 6.2L	Under driver's seat. See Fig. 11.
Gas
"P" Series 4.3L (VIN Z - A/T)	Behind left side of shipping panel. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	Behind left side of shipping panel. See Fig. 4.
"P" Series 5.7L (VIN K - A/T)	Behind left side of shipping panel. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	Behind left side of shipping panel. See Fig. 7.
"P" Series 7.4L (VIN N)	Behind left side of shipping panel. See Fig. 1.
Transmission Control Module
"G" Series	Under driver's seat.
"P" Series	Behind left side of shipping panel.
Windshield Wiper Motor Module	Behind center of dash, on firewall.

GMC Forward Control P3500 1993 - SENDING UNITS & SENSORS

GMC Forward Control P3500 1993 SENDING UNITS & SENSORS LOCATION

Component	Location
Barometric Pressure Sensor (6.2L HD Diesel)	At center of shipping.
Coolant Level Indicator Sensor	In radiator.
Coolant Temp. Sending Unit	On left cylinder head.
Coolant Temperature Sensor
"G" Series 4.3L (VIN Z)	On top front of intake manifold. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On top front of intake manifold. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On top front of intake manifold. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On top front of intake manifold. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On top front of intake manifold. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On top front of intake manifold. See Fig. 7.
"G" Series 5.7L (VIN K)	On top front of intake manifold. See Fig. 8.
"G" Series 7.4L (VIN N)	On top front of intake manifold. See Fig. 9.
"G" Series 7.4L (VIN N)	On top front of intake manifold. See Fig. 10.
"P" Series 7.4L (VIN N)	On top front of intake manifold. See Fig. 1.
Engine Speed Sensor ("G" & "P" Series 6.2L Diesel)	On left front of engine. See Fig. 11.
Input Speed Sensor (6.2L Diesel HD)	On left side of transmission.
Knock Sensor
"G" Series 4.3L (VIN Z)	On left rear of engine. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On right side of engine, near starter. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On right side of engine, near starter. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On right side of engine, near starter. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On right side of engine, near starter. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On right side of engine, near starter. See Fig. 7.
"G" Series 5.7L (VIN K)	On right side of engine, near starter. See Fig. 8.
"G" Series 7.4L (VIN N)	On right side of engine, near starter. See Fig. 10.
Manifold Abs. Press. (MAP) Sensor
"P" Series 7.4L Diesel (VIN N)	Near center of firewall. See Fig. 1.
Gas
"G" Series 4.3L (VIN Z)	On top right of engine. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On top right of engine. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On top right of engine. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On top right of engine. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On top right of engine. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On top right of engine. See Fig. 7.
"G" Series 5.7L (VIN K)	On top right of engine. See Fig. 8.
"G" Series 7.4L (VIN N)	On top right of engine. See Fig. 9.
"G" Series 7.4L (VIN N)	On top right of engine. See Fig. 10.
"P" Series 7.4L (VIN N)	On top right of engine. See Fig. 1.
Oil Pressure Sending Unit	On left rear of engine block.
Output Speed Sensor	On left side of transmission.
Throttle Position Sensor (TPS)
"G" Series 4.3L (VIN Z)	On throttle body (gas), or on injection pump (diesel). See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On throttle body (gas), or on injection pump (diesel). See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On throttle body (gas), or on injection pump (diesel). See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On throttle body (gas), or on injection pump (diesel). See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On throttle body (gas), or on injection pump (diesel). See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On throttle body (gas), or on injection pump (diesel). See Fig. 7.
"G" Series 5.7L (VIN K)	On throttle body (gas), or on injection pump (diesel). See Fig. 8.
"G" Series 7.4L (VIN N)	On throttle body (gas), or on injection pump (diesel). See Fig. 9.
"G" Series 7.4L (VIN N)	On throttle body (gas), or on injection pump (diesel). See Fig. 10.
"P" Series 7.4L (VIN N)	On throttle body (gas), or on injection pump (diesel). See Fig. 1.
"G" & "P" Series 6.2L (Diesel)	On throttle body (gas), or on injection pump (diesel). See Fig. 11.
Transmission Input Speed Sensor	On left side of transmission.
Vehicle Speed Sensor (VSS)
"G" Series 4.3L (VIN Z)	On left rear of transmission. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On left rear of transmission. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On left rear of transmission. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On left rear of transmission. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On left rear of transmission. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On left rear of transmission. See Fig. 7.
"G" Series 5.7L (VIN K)	On left rear of transmission. See Fig. 8.
"G" Series 7.4L (VIN N)	On left rear of transmission. See Fig. 9.
"G" Series 7.4L (VIN N)	On left rear of transmission. See Fig. 10.
"P" Series 7.4L (VIN N)	On left rear of transmission. See Fig. 1.
"G" & "P" Series 6.2L (Diesel)	On left rear of transmission. See Fig. 11.
Water-In-Fuel Sensor (Diesel)	In fuel filter assembly, on top rear of engine.
Wheel Speed Sensors	On each wheel hub assembly.

GMC Forward Control P3500 1993 - MOTORS

GMC Forward Control P3500 1993 MOTORS LOCATION

Component	Location
Auxiliary Cooling Fan	In front of radiator.
Blower Motor
Front	On right side of firewall.
Rear ("G" Series)	On top rear of vehicle.
Vacuum Pump Motor (Diesel)	On right front of engine.
Windshield Washer Pump Motor	In washer fluid reservoir, left side of firewall.
Windshield Wiper Motor	On firewall.

GMC Forward Control P3500 1993 - SOLENOIDS & SOLENOID VALVES

GMC Forward Control P3500 1993 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Brake/Transmission Shift Interlock Solenoid	On steering column.
Cold Advance Solenoid (Diesel)	On top center of engine.
EGR Vacuum Solenoid
"P" Series 7.4L (VIN N)	On left front of engine. See Fig. 1.
"G" Series 4.3L (VIN Z)	On top right of engine. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On top right of engine. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On top right of engine. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On top right of engine. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On top right of engine. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On top right of engine. See Fig. 7.
"G" Series 5.7L (VIN K)	On top right of engine. See Fig. 8.
"G" Series 7.4L (VIN N)	On top right of engine. See Fig. 9.
"G" Series 7.4L (VIN N)	On top right of engine. See Fig. 10.
EGR Vent Solenoid ("P" Series 7.4L VIN N)	On top left rear of engine. See Fig. 1.
EPR Solenoid ("P" Series 7.4L VIN N)	On left front of engine. See Fig. 1.
Fast Idle Solenoid ("P" Series 7.4L VIN N)	On injection pump. See Fig. 1.
Fuel Shutoff Solenoid (Diesel)	At top center of engine, near intake plenum.
Idle Air Control Valve (IAC)
"G" Series 4.3L (VIN Z)	On throttle body (gasoline engines). See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On throttle body (gasoline engines). See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On throttle body (gasoline engines). See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On throttle body (gasoline engines). See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On throttle body (gasoline engines). See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On throttle body (gasoline engines). See Fig. 7.
"G" Series 5.7L (VIN K)	On throttle body (gasoline engines). See Fig. 8.
"G" Series 7.4L (VIN N)	On throttle body (gasoline engines). See Fig. 9.
"G" Series 7.4L (VIN N)	On throttle body (gasoline engines). See Fig. 10.
"P" Series 7.4L (VIN N)	On throttle body (gasoline engines). See Fig. 1.

GMC Forward Control P3500 1993 - SWITCHES

GMC Forward Control P3500 1993 SWITCHES LOCATION

Component	Location
A/C Clutch Cycling Press. Switch	On A/C accumulator.
A/C High Pressure Cut-Out Switch	On rear of A/C compressor.
Aux. Cooling Fan Press. Switch	On right rear of cylinder head, above starter.
Backup Light Switch (A/T)	At base of steering column.
Brake Pressure Warning Switch	On proportioning valve, at left frame rail.
Brake/Transmission Shift Interlock Switch ("G" Series)	On lower steering column.
Coolant Temp. Cut-Out Switch	In thermostat housing.
Fast Idle Temp. Switch (Diesel)	On right rear cylinder head.
Flow Switch	Near power steering pump.
Fuel Pump/Oil Press. Switch
"G" Series 4.3L (VIN Z)	On top rear of engine, near distributor. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On top rear of engine, near distributor. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On top rear of engine, near distributor. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On top rear of engine, near distributor. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On top rear of engine, near distributor. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On top rear of engine, near distributor. See Fig. 7.
"G" Series 5.7L (VIN K)	On top rear of engine, near distributor. See Fig. 8.
"G" Series 7.4L (VIN N)	On lower left front of engine. See Fig. 9.
"G" Series 7.4L (VIN N)	On lower left front of engine. See Fig. 10.
"P" Series 7.4L (VIN N)	On top rear of engine, near distributor.
Hydro-Boost Pressure Warning Switch	On brake master cylinder.
Oil Pressure Switch (Diesel)	On left rear of engine. See Fig. 1.
Parking Brake Warning Switch	On parking brake pedal support.
Seatbelt Warning Switch	On driver's seat belt buckle.

GMC Forward Control P3500 1993 - MISCELLANEOUS

GMC Forward Control P3500 1993 MISCELLANEOUS LOCATION

Component	Location
Blower Motor Resistors	On blower motor, in respective front and rear unit.
Data Link Connector (DLC)
"G" Series 4.3L (VIN Z)	Below steering column. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	Below steering column. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	Below steering column. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	Below steering column. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	Below steering column. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	Below steering column. See Fig. 7.
"G" Series 5.7L (VIN K)	Below steering column. See Fig. 8.
"G" Series 7.4L (VIN N)	Below steering column. See Fig. 9.
"G" Series 7.4L (VIN N)	Below steering column. See Fig. 10.
"P" Series 7.4L (VIN N)	Below steering column. See Fig. 1.
"G" & "P" Series 6.2L (Diesel)	Below steering column. See Fig. 11.
Fuel Heater (Diesel)	At fuel filter assembly.
Fuel Pump Test Connector
"G" Series 4.3L (VIN Z)	On firewall, near fuel pump relay. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	On firewall, near fuel pump relay. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	On firewall, near fuel pump relay. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	On firewall, near fuel pump relay. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	On firewall, near fuel pump relay. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	On firewall, near fuel pump relay. See Fig. 7.
"G" Series 5.7L (VIN K)	On firewall, near fuel pump relay. See Fig. 8.
"G" Series 7.4L (VIN N)	On firewall, near fuel pump relay. See Fig. 9.
"G" Series 7.4L (VIN N)	On firewall, near fuel pump relay. See Fig. 10.
"P" Series 7.4L (VIN N)	On firewall, near fuel pump relay. See Fig. 1.
Vehicle Speed Sensor (VSS) Buffer
"G" Series 4.3L (VIN Z)	Taped to harness, behind instrument panel. See Fig. 2.
"P" Series 4.3L (VIN Z - A/T)	Taped to harness, behind instrument panel. See Fig. 3.
"P" Series 4.3L (VIN Z - M/T)	Taped to harness, behind instrument panel. See Fig. 4.
"G" Series 5.0L (VIN H) & 5.7L (VIN K)	Taped to harness, behind instrument panel. See Fig. 5.
"P" Series 5.7L (VIN K - A/T)	Taped to harness, behind instrument panel. See Fig. 6.
"P" Series 5.7L (VIN K - M/T)	Taped to harness, behind instrument panel. See Fig. 7.
"G" Series 5.7L (VIN K)	Taped to harness, behind instrument panel. See Fig. 8.
"G" Series 7.4L (VIN N)	Taped to harness, behind instrument panel. See Fig. 9.
"G" Series 7.4L (VIN N)	Taped to harness, behind instrument panel. See Fig. 10.
"P" Series 7.4L (VIN N)	Taped to harness, behind instrument panel. See Fig. 1.