GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC P42 Commercial Chassis 🢒 Engine 🢒 Engine Cooling 🢒 Cooling System Component Views
Figure 1:

Engine Wiring Diesel- LH Front Of Bulkhead, Front View
Object Number: 187817 Size: LF
(1)C200
(2)Battery Junction Block
(3)P100
(4)A/C Compressor Relay
(5)Fan Control Relay
(6)Starter Relay
(7)Engine Coolant Level Switch
(8)Auxiliary Engine Coolant Fan
Figure 2:

Vehicle Control Module (L29)
Object Number: 179942 Size: MF
(1)Radiator Support
(2)Auxiliary Engine Coolant Fan
(3)A/C Compressor Refrigerant Pressure Switch
(4)Vehicle Control Module (VCM)
Figure 3:

Engine Wiring Harness to Dash and Steering Column
Object Number: 186174 Size: MF
(1)Turn Signal Switch Connector
(2)Headlamps Dimmer Switch
(3)Data Link Connector (DLC)
(4)Powertrain Control Module (Diesel)
(5)Ignition Switch
(6)Brake Transmission Shift Interlock (BTSI) Solenoid
(7)Daytime Running Lamps (DRL) Relay
(7)Daytime Running Lamps (DRL) Relay
(8)Horn Relay
(8)Horn Relay
(9)Brake Transmission Shift Interlock (BTSI) Relay
(10)Fan Control Relay