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

Mobile Radio (9L4)


Object Number: 1527838  Size: FS
Master Electrical Component List
Control Module References
Roof Beacon Lighting (564/TRW)
Ignition Switch - ACC/RUN and RUN/START Bus Bars and IGN B Fuse
Battery Supply - 1 of 2
Battery Supply - 2 of 2
G100, G101, and G102
Figure 2:

Roof Beaconb Lighting (5G4/TRW)


Object Number: 1527846  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Emergency Vehicle Lighting (5Y0)
Mobile Radio (9L4)
B+ Bar Bus
IPC/DIC, LH HID, RH HID, SEO B1, SEO B2, and TBC BATT Fuses
IPC/DIC, LH HID, RH HID, SEO B1, SEO B2, and TBC BATT Fuses
LED Dimming Supply - 2 of 2
G304, G305, G306 and G390
Figure 3:

Emergency Vehicle Lighting (5Y0)


Object Number: 1527843  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Wrecker Lighting (5X7)
Roof Beacon Lighting (564/TRW)
B+ Bar Bus
ABS, AUX HTR PMP, ESCM, HCM-B, MBEC 1, RTD, STUD1, STUD2, TRANS PUMP, VSES/ECAS Fuses and RT DOORS and SEAT Circuit Breakers
IPC/DIC, LH HID, RH HID, SEO B1, SEO B2, and TBC BATT Fuses
IPC/DIC, LH HID, RH HID, SEO B1, SEO B2, and TBC BATT Fuses
LED Dimming Supply - 2 of 2
G403
G115 and G200 - 1 of 2
Figure 4:

Wrecker Lighting (5X7)


Object Number: 1527850  Size: FS
Master Electrical Component List
Exterior Lighting Systems Description and Operation
Control Module References
Emergency Vehicle Lighting (5Y0)
B+ Bar Bus
IPC/DIC, LH HID, RH HID, SEO B1, SEO B2, and TBC BATT Fuses
Battery Supply - 1 of 2
IPC/DIC, LH HID, RH HID, SEO B1, SEO B2, and TBC BATT Fuses
LED Dimming Supply - 2 of 2
G115 and G200 - 1 of 2