GM Service Manual Online
For 1990-2009 cars
Makes 🢒 Chevrolet 🢒 2004 🢒 C-Series Medium Duty Truck C6/7/8 - Mexico 🢒 Body 🢒 Lighting Systems 🢒 Lighting Systems Component Views
Figure 1:

Forward Lamps Harness, Left Front View
Object Number: 690565 Size: MF
(1)Park/Turn Signal Lamp -- RF
(2)Park/Turn Signal Lamp -- LF
(3)Headlamp -- Right
(4)Headlamp -- Left
Figure 2:

Automatic Transmission Harness --Typical-- without MTW/MX4/MWF
Object Number: 689497 Size: MF
(1)To Backup Lamp Switch
(2)Vehicle Speed Sensor (VSS)
(3)Automatic Transmission Modulator
(4)Neutral Safety Switch
(5)C408/C409
Figure 3:

Manual Transmission Harness, Left Forward View
Object Number: 689881 Size: MF
(1)Backup Lamp Switch
(2)Vehicle Speed Sensor (VSS) (JE4)
(3)Vehicle Speed Sensor (VSS) (JE3)
Figure 4:

Instrument Panel Harness to Instrument Panel, Left Front
Object Number: 689504 Size: MF
(1)Windshield Wiper Motor
(2)Upfitter AUX WRG Connector, Exterior
(3)Trailer Stop Lamp Switch
(4)C107
(5)C113
(6)Differential Lock Switch
Figure 5:

Instrument Panel Harness to IP Mounted Components, Right Front View
Object Number: 689502 Size: MF
(1)Power Brake (P/B) Booster Pump Motor Relay
(2)Park Brake Pump Motor Relay
(3)Trailer Stop Lamp Relay
(4)Transmission Control Relay - MTW/MX4/Ignition Relay -- Engine Controls - L18
(5)ABS Relay Center
(6)Fuse Block 2 -- Underhood
(7)Fuse Block 1 -- Underhood
(8)C123
(9)Connector
(10)Windshield Washer Fluid Pump
(11)Windshield Washer Reservoir
Figure 6:

IP Harness to Components, Right View
Object Number: 689511 Size: MF
(1)Stop Lamp Switch Interface Module
(2)Convenience Center
(3)SERVICE TRANS FILTER Indicator Lamp
(4)Seat Belt Indicator Lamp
(5)Upfitter Accessory Feed Connector
(6)C210
(7)Upfitter AUX WRG Connector, Interior
(8)Daytime Running Lamps (DRL) Diode
(9)Blower Motor C1
(10)Blower Motor C2
(11)C208
(12)G210
(13)Speaker - RF
Figure 7:

Rear of Instrument Panel, Top View
Object Number: 689819 Size: MF
(1)Tractor Marker Lamps Relay or Column Shift Relay (LG5)/Transmission Park Column Switch Relay (L18)
(2)Lighting Relay
(3)Ignition 3 Relay
(4)Power Window Relay-L18/Late LG5
(5)Horn Relay
(6)Convenience Center
(7)Power Window Relay-Early LG5
(8)Blower Relay 2
(9)Blower Relay 1
(10)Accessory Relay
(11)Daytime Running Lamps (DRL) Control Module
(12)Fuel Pump Relay (L18)/Fuel Heater Relay (LG5)
(13)Daytime Running Lamps Relay
(14)Daytime Running Lamps (DRL) Diode
(15)Auxiliary Wiring Relay
Figure 8:

Heater Controls, Rear View
Object Number: 690426 Size: MF
(1)Heater Control
(2)Blower Motor Switch
(3)Heater Control Lamp
(4)Blower Motor Diode Module
(5)Heater Control Lamp
Figure 9:

Instrument Panel Harness to Instrument Panel, Right Front View
Object Number: 689889 Size: LF
(1)Ignition Switch
(2)Park Brake Switch (JE3/J71)
(3)Turn Signal/Multifunction Switch C3
(4)Turn Signal/Multifunction Switch C2
(5)Turn Signal/Multifunction Switch C1
(6)Headlamp Dimmer Switch
(7)Turn Signal/Hazard Flasher Module
(8)Park/Neutral (PNP) Switch C3
(9)Park/Neutral (PNP) Switch C2
(10)Park/Neutral (PNP) Switch C1
(11)Accelerator Pedal Position (APP) Sensor
(12)Low Air Pressure Switch
(13)Stop Lamp Switch
Figure 10:

Fuel Pump Prime, Data Link Connector (DLC)
Object Number: 689888 Size: MF
(1)Instrument Panel
(2)Door Jamb Switch -- Driver
(3)Fuel Pump Prime Connector
(4)Data Link Connector (DLC)
(5)Headlamp Switch
(6)IP Dimmer Switch
Figure 11:

Lower IP Components
Object Number: 689521 Size: MF
(1)C215
(2)Ashtray Lamp
(3)Auxiliary Power Posts
(4)Cigar Lighter
Figure 12:

Hazard Switch, IP Mounted
Object Number: 690566 Size: SF
(1)Hazard Switch, Hazard Indicator Lamp
Figure 13:

Instrument Panel, Left View
Object Number: 690018 Size: SF
(1)Trailer Marker Lamp Switch
(2)Outside Heated Mirror Switch
(3)Exhaust Brake Switch
Figure 14:

Steering Column, Left Forward View
Object Number: 689823 Size: MF
(1)Ignition Switch
(2)Headlamp Dimmer Switch
(3)G208
Figure 15:

Hazard Switch, Column Mounted
Object Number: 690570 Size: SF
(1)Hazard Switch
Figure 16:

Cab Interior, Lower Left Side
Object Number: 689524 Size: MF
(1)G211
(2)C223
(3)Park Brake Pressure Indicator Switch
Figure 17:

Cab, Top View
Object Number: 690572 Size: MF
(1)Dome Lamp
Figure 18:

Cab Exterior, Upper Left Front View
Object Number: 689523 Size: MF
(1)Marker Lamps -- Roof
(2)Clearance Lamps
(3)C229
Figure 19:

Rear of Cab, Left Rear View
Object Number: 690574 Size: MF
(1)Tractor/Trailer Receptacle
Figure 20:

Rear of Chassis, Left Rear View
Object Number: 690576 Size: MF
(1)Tail Lamp -- Left
(2)Tail Lamp -- Right