GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Astro - 2WD 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Lighting Systems Component Views
Figure 1:

Forward Lamp Harness, RH Side
Object Number: 374516 Size: LF
(1)Window Washer Pump Rear
(2)S101
(3)Park/Turn Lamp RH Front
(4)Park/Turn Lamp RH Front Connector
(5)Side Marker Lamp RH Front Connector
(6)Side Marker Lamp RH Front
(7)S100
(8)Hi/Lo Headlamp (Sealed Beam) RH
(9)G100
(10)Blower Motor Front
(11)Windshield Washer Pump Front
(12)Blower Motor Resistor and Relay Pack
Figure 2:

Forward Lamp Harness, LH Side (Electrical)
Object Number: 374515 Size: LF
(1)LH Hi/Low Beam Headlamp (Sealed Beam)
(2)C100
(3)P100
(4)C101
(5)S135
(6)C102
(7)S106
(8)S103
(9)LH Front Park/Turn Lamp Connector
(10)LH Front Park/Turn Lamp
(11)S102
(12)S105
(13)LH Front Side Marker Lamp Connector
(14)S104
(15)LH Front Side Marker
(16)Front End Discriminating Sensor Connector
(17)Front End Discriminating Sensor
(18)S107
Figure 3:

Headlamp Assembly (Left Side)
Object Number: 297866 Size: MF
(1)High Beam Headlamp (Composite)
(2)Low Beam Headlamp (Composite)
Figure 4:

Brake Pedal Position (BPP)
Object Number: 297850 Size: MF
(1)Brake Pedal Position (BPP) Switch Connector
(2)Brake Pedal Position (BPP) Switch
Figure 5:

IP Fuse Block/Convenience Center Wiring (Electrical)
Object Number: 374538 Size: LF
(1)C212
(2)Audio Alarm Module
(3)Convenience Center
(4)Turn/Hazard Flasher Module
(5)Horn Relay
(6)DRL Relay
(7)IP Fuse Block
(8)C213
Figure 6:

Dome Lamp Defeat Switch
Object Number: 281314 Size: SF
(1)Dome Lamp Defeat Switch
(2)Dome Lamp Switch
Figure 7:

LH Kick Panel Wiring
Object Number: 374521 Size: LF
(1)G300
(2)C301
(3)C303
(4)S300
(5)LH Door Jamb Switch
Figure 8:

Vanity Mirror Wiring
Object Number: 374520 Size: LF
(1)S237
(2)Inside Rearview Mirror Connector
(3)Vanity Lamp Connector
(4)Vanity Lamp
(5)S236
(6)C230
Figure 9:

LH Courtesy Lamp Wiring
Object Number: 297570 Size: SF
(1)D300
(2)LH Courtesy Lamp
Figure 10:

Door Courtesy Lamp
Object Number: 297836 Size: MF
(1)Door Courtesy Lamp
Figure 11:

Side Door Contact Plate Wiring
Object Number: 297705 Size: MH
(1)RH B-Pillar
(2)Side Door Jamb Switch Connectors
(3)Side Door Jamb Switch
(4)Side Door Contact Plate
Figure 12:

RH B Pillar Wiring (Passenger Van)
Object Number: 297822 Size: MH
(1)RH Stepwell Lamp
(2)RH Courtesy Lamp
Figure 13:

RH B Pillar Wiring (Cargo Van)
Object Number: 297830 Size: MH
(1)RH Stepwell Lamp
(2)RH Courtesy Lamp
Figure 14:

Dome/Reading Lamp Wiring
Object Number: 297818 Size: MF
(1)Dome Lamp
(2)Dome/Reading Lamps
(1)Dome Lamp
(3)Reading Lamps
Figure 15:

Liftgate Strut Switch Wiring
Object Number: 374533 Size: LF
(1)LH Liftgate Strut Switch
(2)LH Liftgate Strut Switch Connector
(3)Liftgate Lock/Unlock Relay
(4)S334
(5)S335
Figure 16:

Center High Mounted Stoplamp
Object Number: 297812 Size: MF
(1)Center High Mounted Stop Lamp Connector
(2)Center High Mounted Stop Lamp (CHMSL)
Figure 17:

License Plate Wiring
Object Number: 297808 Size: MF
(1)License Lamp Connector
(2)License Lamp
Figure 18:

Rear Lamps Wiring
Object Number: 297806 Size: MF
(1)Tail/Stop-Turn Lamp
(2)Side Marker Lamp Rear
(3)Backup Lamp