GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Base Radio


Object Number: 491604  Size: FS
Entertainment Components
Radio/Audio System Circuit Description
Power and Ground (Premium Radio w/ Speed Compensated Volume)
Handling ESD Sensitive Parts Notice
WIPER Fuse 17, RADIO ACCY Fuse 2 and RR WIPER Fuse 23
BATT and LIGHTING Fuse
CIG LTR Fuse 13, RADIO BATT Fuse 19 and CRANK Fuse 8
Dimming Rheostat
Headlamp and Panel Dimmer Switch
G200 (1 of 2)
G200 (1 of 2)
Figure 2:

Power and Ground (Premium Radio w/ Speed Compensated Volume)


Object Number: 491605  Size: FS
Entertainment Components
Radio/Audio System Circuit Description
Speakers and Sub-Woofer (Premium Radio w/ Speed Compensated Volume)
Base Radio
Handling ESD Sensitive Parts Notice
BATT and LIGHTING Fuse
CIG LTR Fuse 13, RADIO BATT Fuse 19 and CRANK Fuse 8
WIPER Fuse 17, RADIO ACCY Fuse 2 and RR WIPER Fuse 23
Dimming Rheostat
Headlamp and Panel Dimmer Switch
Cruise Control Schematics
G200 (1 of 2)
Figure 3:

Speakers and Sub-Woofer (Premium Radio w/ Speed Compensated Volume)


Object Number: 491609  Size: FS
Entertainment Components
Radio/Audio System Circuit Description
Power, Ground, and Remote CD (Premium Radio w/ Rear Control)
Power and Ground (Premium Radio w/ Speed Compensated Volume)
Handling ESD Sensitive Parts Notice
BATT and LIGHTING Fuse
STOP/HAZ Fuse 1 and AUX PWR Fuse 7
STOP/HAZ Fuse 1 and AUX PWR Fuse 7
G301, G303, G400 and G404
Figure 4:

Power, Ground, and Remote CD (Premium Radio w/ Rear Control)


Object Number: 491612  Size: FS
Entertainment Components
Radio/Audio System Circuit Description
Rear Radio Control Module (Premium Radio w/ Rear Radio Control)
Speakers and Sub-Woofer (Premium Radio w/ Speed Compensated Volume)
Handling ESD Sensitive Parts Notice
BATT and LIGHTING Fuse
CIG LTR Fuse 13, RADIO BATT Fuse 19 and CRANK Fuse 8
Rear Radio Control Module (Premium Radio w/ Rear Radio Control)
Dimming Rheostat
Headlamp and Panel Dimmer Switch
Cruise Control Schematics
G200 (1 of 2)
Figure 5:

Rear Radio Control Module (Premium Radio w/ Rear Radio Control)


Object Number: 491614  Size: FS
Entertainment Components
Radio/Audio System Circuit Description
Speakers and Sub-Woofer (Premium Radio w/ Rear Control)
Power, Ground, and Remote CD (Premium Radio w/ Rear Control)
Handling ESD Sensitive Parts Notice
Power, Ground, and Remote CD (Premium Radio w/ Rear Control)
WIPER Fuse 17, RADIO ACCY Fuse 2 and RR WIPER Fuse 23
Window and Door Lock Switches
Overhead Console
G105 and G107
G105 and G107
Figure 6:

Speakers and Sub-Woofer (Premium Radio w/ Rear Control)


Object Number: 491620  Size: FS
Entertainment Components
Radio/Audio System Circuit Description
Rear Radio Control Module (Premium Radio w/ Rear Radio Control)
Handling ESD Sensitive Parts Notice
BATT and LIGHTING Fuse
STOP/HAZ Fuse 1 and AUX PWR Fuse 7
G301, G303, G400 and G404