GM Service Manual Online
For 1990-2009 cars only
Makes šŸ¢’ Chevrolet šŸ¢’ 2000 šŸ¢’ Chevy C Silverado - 2WD šŸ¢’ Body and Accessories šŸ¢’ Cellular Communication šŸ¢’ Cellular Communication Component Views
Figure 1:

OnStarĀ® Component Locations
Object Number: 623162 Size: MF
(1)Cellular Antenna
(2)OnStarĀ® Microphone
(3)Global Positioning System (GPS)
(4)Body Wiring Junction Block
(5)Vehicle Communication Unit
(6)Keypad
(7)Vehicle Interface Unit
Figure 2:

Cell Phone Wiring Harness to Body Wiring Junction Block
Object Number: 615945 Size: MF
(1)Body Wiring Harness Junction Block
(2)C3
(3)Cell Phone Harness
Figure 3:

Cell Phone Harness to Roof Front Header
Object Number: 615937 Size: MF
(1)Front Side Door Opening Reinforcement
(2)Cell Phone Harness
(3)Body Side Inner Panel
Figure 4:

OnStarĀ® Vehicle Interface Unit (VIU)
Object Number: 623205 Size: MF
(1)OnStarĀ® (Vehicle Interface Unit)
(2)VIU Connector C-2 (Blue)
(3)VIU Connector C-1 (Red)
(4)I/P Panel-RH
Figure 5:

Onstar Vehicle Communication Unit (VCU)
Object Number: 623169 Size: MF
(1)IP Support Bracket
(2)Vehicle Communication Unit (VCU)
(3)Vehicle Communication Unit (VCU) Connector
(4)C248
(5)Vehicle Communication Unit (VCU) Harness
Figure 6:

GPS Antenna
Object Number: 623207 Size: MF
(1)Global Positioning System (GPS) Harness
(2)GPS Connector
(3)GPS Antenna
Figure 7:

Overhead Console -- OnStarĀ® Components
Object Number: 623185 Size: MF
(1)Inline Connector C211
(2)Overhead Reading Lamps
(3)OnStarĀ® Microphone
Figure 8:

Airbag Disabling Switch
Object Number: 623177 Size: MF
(1)OnStarĀ® Communications Keypad
(2)Airbag Disabling Switch Connector
(3)Airbag Disabling Switch
Figure 9:

OnStarĀ® Keypad
Object Number: 623182 Size: MF
(1)OnStarĀ® Keypad Connector
(2)OnStarĀ® Keypad
Figure 10:

Behind the Center of the I/P -- Radio Connections
Object Number: 623166 Size: MF
(1)Radio
(2)I/P Connector to Radio Connector C-3
(3)Jumper Connector, With Remote CD