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

B+ Bussing


Object Number: 1500835  Size: FS
Master Electrical Component List
Control Module References
Underhood Junction Block - IBCM Batt1, BCM - Radio/RFA, Ignigion Sensor, HVAC BATT, Cluster/Theft, Air Bag Batt Fuses
Figure 2:

Underhood Junction Block - IBCM Batt 1, BCM - Radio/RFA, Ignition Sensor, HVAC BATT, Cluster/Theft, Air Bag Batt Fuses


Object Number: 1500836  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block - RBEC Fuse Rear Fuse Block - Cigar/Aux Power, Sunroof,RKEW/SM/DVD/UGD, Stop Lamp, Rear Defog, HTD Mirror, AUX PWR, HTD Seat Fuses
B+ Bussing
B+ Bussing
SIR Caution for Zoning
Figure 3:

Underhood Fuse Block - RBEC Fuse, Rear Fuse Block - Cigar/Aux Power, Sunroof, RKE/XM/DVD/UGD, Stop Lp, Rear Defog, HTD Mirror, AUX PWR, HTD Seat Fuses


Object Number: 1500838  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block - Run Relay, RBEC Battery 2 Fuses, Rear Fuse BLock - Driver Power Seat, Fuel Pump, Park Lamps, Trunk Release, ERLS Fuses
Underhood Junction Block - IBCM Batt1, BCM - Radio/RFA, Ignigion Sensor, HVAC BATT, Cluster/Theft, Air Bag Batt Fuses
B+ Bussing
Figure 4:

Underhood Fuse Block - Run Relay, RBEC Batt 2 Fuses, Rear Fuse Block - Driver Pwr Seat, Fuel Pump, Park Lamps, Trunk Release, ERLS Fuses


Object Number: 1500839  Size: FS
Master Electrical Component List
Control Module References
PCM Batt, ABS, EPS, ICBM Batt1, ICBM Batt2 Fuses
Underhood Fuse Block - RBEC Fuse Rear Fuse Block - Cigar/Aux Power, Sunroof,RKEW/SM/DVD/UGD, Stop Lamp, Rear Defog, HTD Mirror, AUX PWR, HTD Seat Fuses
B+ Bussing
Figure 5:

PCM Batt, ABS, EPS, ICBM Batt 1, ICBM Batt 2 Fuses


Object Number: 1500840  Size: FS
Master Electrical Component List
Control Module References
Run/Crank ICBM, Transmission, Injectors, ABS, PCM IGN, IGN Fuses
Underhood Fuse Block - Run Relay, RBEC Battery 2 Fuses, Rear Fuse BLock - Driver Power Seat, Fuel Pump, Park Lamps, Trunk Release, ERLS Fuses
B+ Bussing
Figure 6:

Run/Crank ICBM, Transmission, Injectors, ABS, PCM IGN, IGN Fuses


Object Number: 1500841  Size: FS
Master Electrical Component List
Control Module References
Air, A/C Clutch, ECT IGN, ERLS #1 Fuses
PCM Batt, ABS, EPS, ICBM Batt1, ICBM Batt2 Fuses
B+ Bussing
Underhood Juction Block - Run Relay, Run/Crank ICBM, HVAC Blower, HVAC Head/ECC, EPS AIR BAG IGN, Run/Crank ELEC Fuses
Figure 7:

AIR, A/C Clutch, ECT IGN, ERLS#1 Fuses


Object Number: 1500842  Size: FS
Master Electrical Component List
Control Module References
Underhood Junction Block - ICBM Batt2, BCM - PWR Windows, Wiper Sw, Sunroof/HTD Seat Fuses
Run/Crank ICBM, Transmission, Injectors, ABS, PCM IGN, IGN Fuses
B+ Bussing
Figure 8:

Underhood Junction Block - ICBM Batt 2, BCM - PWR Windows, Wiper Sw, Sunroof/HTD Seat Fuses


Object Number: 1500843  Size: FS
Master Electrical Component List
Control Module References
Underhood Juction Block - Run Relay, Run/Crank ICBM, HVAC Blower, HVAC Head/ECC, EPS AIR BAG IGN, Run/Crank ELEC Fuses
Air, A/C Clutch, ECT IGN, ERLS #1 Fuses
B+ Bussing
Interior Lights, Power Mirror, Pedal, OnStar Fuses
Figure 9:

Underhood Junction Block - Run Relay, Run/Crank IBCM, HVAC Blower, HVAC Head/ECC, EPS, AIR BAG IGN, Run/Crank ELEC Fuses


Object Number: 1500844  Size: FS
Master Electrical Component List
Control Module References
Interior Lights, Power Mirror, Pedal, OnStar Fuses
Underhood Junction Block - ICBM Batt2, BCM - PWR Windows, Wiper Sw, Sunroof/HTD Seat Fuses
Run/Crank ICBM, Transmission, Injectors, ABS, PCM IGN, IGN Fuses
SIR Caution for Zoning
Figure 10:

Interior Lights, Pwr Mirror, Pedal, and OnStar Fuses


Object Number: 1500846  Size: FS
Master Electrical Component List
Control Module References
Underhood Juction Block - Run Relay, Run/Crank ICBM, HVAC Blower, HVAC Head/ECC, EPS AIR BAG IGN, Run/Crank ELEC Fuses
Run/Crank ICBM, Transmission, Injectors, ABS, PCM IGN, IGN Fuses