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

Power (Chevy/GMC)


Object Number: 714329  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Ground (Chevy/GMC)
Ign ACC, RUN and RAP Bus Bar
AUX PWR, RDO BATT and HDLP SW Fuses
ILLUM and PARK LP Fuses
w/o Trip Computer
Rear Seat Audio (RSA) Control (Envoy)
AUX PWR, RDO BATT and HDLP SW Fuses
ILLUM Power (Pickup Except Crewcab)
Figure 2:

Ground (Chevy/GMC)


Object Number: 670564  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
BCM (Chevy/GMC)
Power (Chevy/GMC)
G203 and G204 (Pickup)
G203 and G204 (Pickup)
Steering Wheel Controls Schematics
Headlight Leveling Schematics (Export)
Gauges
Vehicle Speed Signal, Transfer Case Shift Control Module and 4WD IndicatOr Switch
Figure 3:

BCM (Chevy/GMC)


Object Number: 670568  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Speakers (Regular Cab and Extended Cab w/ 3rd Door - Chevy/GMC)
Ground (Chevy/GMC)
PCM, Data Link Connector (DLC) and Dimming Signal
PCM, Data Link Connector (DLC) and Dimming Signal
Figure 4:

Speakers (Regular Cab and Extended Cab w/ 3rd Door -- Chevy/GMC)


Object Number: 670571  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Speakers (Extended Cab w/o 3rd Door - Chevy/GMC)
BCM (Chevy/GMC)
Figure 5:

Speakers (Extended Cab w/o 3rd Door -- Chevy/GMC)


Object Number: 670572  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Speakers (Chevy/GMC Crew Cab and Utility Except Envoy)
Speakers (Regular Cab and Extended Cab w/ 3rd Door - Chevy/GMC)
Figure 6:

Speakers (Chevy/GMC Crew Cab and Utility Except Envoy)


Object Number: 670575  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Remote Tape/CD Player (Chevy/GMC)
Speakers (Extended Cab w/o 3rd Door - Chevy/GMC)
Figure 7:

Remote Tape/CD Player (Chevy/GMC)


Object Number: 670576  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Audio Amplifier Power and Ground (Chevy/GMC)
Speakers (Chevy/GMC Crew Cab and Utility Except Envoy)
Figure 8:

Audio Amplifier Power and Ground (Chevy/GMC)


Object Number: 670578  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Audio Amplifier Inputs (Chevy/GMC)
Remote Tape/CD Player (Chevy/GMC)
INT BATT Fuse
G204 and G205 (Envoy)
G204 and G205 (Envoy)
Except Envoy
Figure 9:

Audio Amplifier Inputs (Chevy/GMC)


Object Number: 670580  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Amplifier, Left Channel Output (Chevy/GMC)
Audio Amplifier Power and Ground (Chevy/GMC)
Figure 10:

Amplifier, Left Channel Output (Chevy/GMC)


Object Number: 670583  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Audio Amplifier, Right Channel Output (Chevy/GMC)
Audio Amplifier Inputs (Chevy/GMC)
Figure 11:

Audio Amplifier, Right Channel Output (Chevy/GMC)


Object Number: 670586  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Rear Seat Audio (RSA) Control (Envoy)
Amplifier, Left Channel Output (Chevy/GMC)
Figure 12:

Rear Seat Audio (RSA) Control (Envoy)


Object Number: 670588  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Radio Power and Ground and Speakers (w/o Audio Amplifier- Bravada)
Audio Amplifier, Right Channel Output (Chevy/GMC)
Power (Chevy/GMC)
ILLUM and PARK LP Fuses
G203 and G204 (Envoy)
Envoy Only
G203 and G204 (Envoy)
Figure 13:

Radio Power and Ground and Speakers (w/o Audio Amplifier -- Bravada)


Object Number: 670591  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Radio Power and Ground (w/ Audio Amplifier - Bravada)
Rear Seat Audio (RSA) Control (Envoy)
Ign ACC, RUN and RAP Bus Bar
AUX PWR, RDO BATT and HDLP SW Fuses
ILLUM and PARK LP Fuses
G203 and G204 (Envoy)
G203 and G204 (Envoy)
w/o Trip Computer
AUX PWR, RDO BATT and HDLP SW Fuses
ILLUM Power (Utility)
Steering Wheel Controls Schematics
Air Temperature Sensor - Outside (w/ Trip Computer)
Figure 14:

Radio Power and Ground (w/ Audio Amplifier -- Bravada)


Object Number: 670593  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Remote Playback Device - Tape or CD Player (Bravada)
Radio Power and Ground and Speakers (w/o Audio Amplifier- Bravada)
Ign ACC, RUN and RAP Bus Bar
AUX PWR, RDO BATT and HDLP SW Fuses
ILLUM and PARK LP Fuses
w/o Trip Computer
AUX PWR, RDO BATT and HDLP SW Fuses
ILLUM Power (Utility)
G203 and G204 (Utility w/ Automatic A/C)
G203 and G204 (Utility w/ Automatic A/C)
Steering Wheel Controls Schematics
Figure 15:

Remote Playback Device - Tape or CD Player (Bravada)


Object Number: 670597  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Audio Amplifier Power and Ground and Inputs (Bravada)
Radio Power and Ground (w/ Audio Amplifier - Bravada)
AUX PWR, RDO BATT and HDLP SW Fuses
AUX PWR, RDO BATT and HDLP SW Fuses
G203 and G204 (Utility w/ Automatic A/C)
G203 and G204 (Utility w/ Automatic A/C)
Figure 16:

Audio Amplifier Power and Ground and Inputs (Bravada)


Object Number: 670599  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Audio Amplifier, Left Channel Output (Bravada)
Remote Playback Device - Tape or CD Player (Bravada)
INT BATT Fuse
Except Envoy
Figure 17:

Audio Amplifier, Left Channel Output (Bravada)


Object Number: 670602  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Amplifier, Right Channel Output (Bravada)
Audio Amplifier Power and Ground and Inputs (Bravada)
Figure 18:

Amplifier, Right Channel Output (Bravada)


Object Number: 670606  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation w/o CTF
Audio Amplifier, Left Channel Output (Bravada)