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

B+ Bussing


Object Number: 1633610  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block - IBCM 1, Body Control Module (BCM), AIR BAG (BATT), CLUSTER/THEFT, HVAC CTRL (BATT), IGN SENSOR, and RADIO Fuses
Figure 2:

Underhood Fuse Block - IBCM 1, Body Control Module (BCM), AIR BAG (BATT), CLUSTER/THEFT, HVAC CTRL (BATT), IGN SENSOR, and RADIO Fuses


Object Number: 1633611  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block - RBEC 1 Fuse, Rear Fuse Block, AUX PWR #2, BCK/UP LAMPS, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM/DVD/UGD, RR DEFOG and S/ROOF Fuses
B+ Bussing
B+ Bussing
Power and Grounding Schematic Icons
Figure 3:

Underhood Fuse Block - RBEC 1 Fuse, Rear Fuse Block, AUX PWR #2, BCK/UP LAMPS, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM/DVD/UGD, RR DEFOG, and S/ROOF Fuses


Object Number: 1634128  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block, RBEC 2, RUN RLY, Body Control Module (BCM) HVAC BLOWER HIGH Relay, RUN Relay, HVAC BLOWER, HVAC CTRL (IGN), Rear Fuse Block, FUEL/PMP Relay, PARK LP Relay, TRUNK Relay, DRV ST
Underhood Fuse Block - IBCM 1, Body Control Module (BCM), AIR BAG (BATT), CLUSTER/THEFT, HVAC CTRL (BATT), IGN SENSOR, and RADIO Fuses
B+ Bussing
Figure 4:

Underhood Fuse Block - RBEC 2, RUN RLY, Body Control Module (BCM), HVAC BLOWER HIGH Relay, RUN Relay, HVAC BLOWER, HVAC CTRL (IGN), Rear Fuse Block, FUEL/PMP Relay, PARK LP Relay, TRUNK Relay, DRV ST, EMISSION 2, FUEL PUMP, PARK LAMPS and TUNK Fuses


Object Number: 1634470  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block, DRL Relay, LO/BEAM Relay, HI/BEAM Relay, ABS, DRL, EPS, IBCM1, IBCM2, LT HI BEAM, LT LOW BEAM, PCM, RT HI BEAM, RT LOW BEAM, TCM Fuses
Underhood Fuse Block - RBEC 1 Fuse, Rear Fuse Block, AUX PWR #2, BCK/UP LAMPS, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM/DVD/UGD, RR DEFOG and S/ROOF Fuses
B+ Bussing
Underhood Fuse Block - RBEC 1 Fuse, Rear Fuse Block, AUX PWR #2, BCK/UP LAMPS, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM/DVD/UGD, RR DEFOG and S/ROOF Fuses
Figure 5:

Underhood Fuse Block - DRL Relay, LO/BEAM Relay, HI/BEAM Relay, ABS, DRL, EPS, IBCM 1, IBCM 2, LT HI BEAM, LT LOW BEAM, PCM, RT HI BEAM, RT LOW BEAM, and TCM Fuses


Object Number: 1636001  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block, RUN/CRANK Relay, ABS, IGN 1, INJ, PCM IGN 1, and TRANS Fuses
Underhood Fuse Block, RBEC 2, RUN RLY, Body Control Module (BCM) HVAC BLOWER HIGH Relay, RUN Relay, HVAC BLOWER, HVAC CTRL (IGN), Rear Fuse Block, FUEL/PMP Relay, PARK LP Relay, TRUNK Relay, DRV ST
B+ Bussing
Figure 6:

Underhood Fuse Block - RUN/CRANK Relay, ABS, IGN 1, INJ, PCM IGN 1, and TRANS Fuses


Object Number: 1636278  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block, A/C CLUTCH Relay, PWR/TRN Relay, A/C CLU, EMISSION 1, and ETC Fuses
Underhood Fuse Block, DRL Relay, LO/BEAM Relay, HI/BEAM Relay, ABS, DRL, EPS, IBCM1, IBCM2, LT HI BEAM, LT LOW BEAM, PCM, RT HI BEAM, RT LOW BEAM, TCM Fuses
B+ Bussing
Underhood Fuse Block, IBCM (RUN/CRANK), Body Control Module (BCM), AIR BAG (IGN), EPS and RUN/CRANK Fuses
Figure 7:

Underhood Fuse Block - A/C CLUTCH Relay, PWR/TRN Relay, A/C CLU, EMISSION 1, and ETC Fuses


Object Number: 1636343  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block, ICBM 2, Body Control Module (BCM), ACCESSORY Relay, DOOR LOCK, INTERIOR LIGHTS, POWER WINDOWS, REAR WIPER, ROOF/HEAT SEAT and WIPER SW Fuses
Underhood Fuse Block, RUN/CRANK Relay, ABS, IGN 1, INJ, PCM IGN 1, and TRANS Fuses
B+ Bussing
Figure 8:

Underhood Fuse Block - IBCM 2, Body Control Module (BCM) ACCESSORY Relay, DOOR LOCK, INTERIOR LIGHTS, POWER WINDOWS, REAR WIPER, ROOF/HEAT SEAT, and WIPER SW Fuses


Object Number: 1636705  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block, IBCM (RUN/CRANK), Body Control Module (BCM), AIR BAG (IGN), EPS and RUN/CRANK Fuses
Underhood Fuse Block, A/C CLUTCH Relay, PWR/TRN Relay, A/C CLU, EMISSION 1, and ETC Fuses
B+ Bussing
Body Control Module (BCM) INTERIOR LIGHTS, ONSTAR, PEDAL, and POWER MIRRORS Fuses
Figure 9:

Underhood Fuse Block - IBCM (RUN/CRANK), Body Control Module (BCM), AIR BAG (IGN), EPS and RUN/CRANK Fuses


Object Number: 1636708  Size: FS
Master Electrical Component List
Control Module References
Body Control Module (BCM) INTERIOR LIGHTS, ONSTAR, PEDAL, and POWER MIRRORS Fuses
Underhood Fuse Block, ICBM 2, Body Control Module (BCM), ACCESSORY Relay, DOOR LOCK, INTERIOR LIGHTS, POWER WINDOWS, REAR WIPER, ROOF/HEAT SEAT and WIPER SW Fuses
Underhood Fuse Block, RUN/CRANK Relay, ABS, IGN 1, INJ, PCM IGN 1, and TRANS Fuses
Power and Grounding Schematic Icons
Power and Grounding Schematic Icons
Figure 10:

Body Control Module (BCM) INTERIOR LIGHTS, ONSTAR, PEDAL and POWER MIRRORS Fuses


Object Number: 1636711  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block, IBCM (RUN/CRANK), Body Control Module (BCM), AIR BAG (IGN), EPS and RUN/CRANK Fuses
Underhood Fuse Block, ICBM 2, Body Control Module (BCM), ACCESSORY Relay, DOOR LOCK, INTERIOR LIGHTS, POWER WINDOWS, REAR WIPER, ROOF/HEAT SEAT and WIPER SW Fuses