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

B+ Bus


Object Number: 1786193  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block IBCM 1, Body Control Module (BCM) AIRBAG (BATT), CLUSTER/THEFT, HVAC CTRL (BATT), IGN SENSOR and RADIO Fuses
Figure 2:

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


Object Number: 1786194  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block RBEC 1 and Rear Fuse Block AUX #2, BCK/UP LAMPS, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM/DVD/UGD, RR DEFOG and S/ROOF Fuses
B+ Bus
Power and Grounding Schematic Icons
Power and Grounding Schematic Icons
B+ Bus
Figure 3:

Underhood Fuse Block RBEC 1 and 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: 1786196  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) AIRBAG (BATT), CLUSTER/THEFT, HVAC CTRL (BATT), IGN SENSOR and RADIO Fuses
B+ Bus
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
Figure 4:

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


Object Number: 1786199  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block RBEC 1 and Rear Fuse Block AUX #2, BCK/UP LAMPS, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM/DVD/UGD, RR DEFOG and S/ROOF Fuses
B+ Bus
Underhood Fuse Block RBEC 1 and Rear Fuse Block AUX #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, HI/BEAM and LO/BEAM Relays, ABS, DRL, EPS, IBCM 1, IBCM 2, LT HI BEAM, LT LOW BEAM, RT HIGH BEAM, RT LOW BEAM, PCM and TCM Fuses


Object Number: 1786203  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block RUN/CRANK Relay, ABS, IGN 1, INJ, ECM 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+ Bus
Figure 6:

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


Object Number: 1786205  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block A/C CLUTCH and PWR/TRN Relays, A/C CLU, EMISSION 1, ETC and INJ Fuses
Underhood Fuse Block DRL, HI/BEAM and LO/BEAM Relays, ABS, DRL, EPS, IBCM 1, IBCM 2, LT HI BEAM, LT LOW BEAM, RT HI BEAM, RT LOW BEAM, PCM and TCM Fuses
B+ Bus
Underhood Fuse Block IBCM (RUN/CRANK) Fuse, Body Control Module (BCM) AIR BAG (IGN), EPS and RUN/CRANK Fuses
Figure 7:

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


Object Number: 1786206  Size: FS
Master Electrical Component List
Control Module References
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
Underhood Fuse Block RUN/CRANK Relay, ABS, IGN 1, INJ, ECM IGN 1 and TRANS Fuses
Underhood Fuse Block RUN/CRANK Relay, ABS, IGN 1, INJ, ECM IGN 1 and TRANS Fuses
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: 1786208  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block IBCM (RUN/CRANK) Fuse, Body Control Module (BCM) AIR BAG (IGN), EPS and RUN/CRANK Fuses
Underhood Fuse Block A/C CLUTCH and PWR/TRN Relays, A/C CLU, EMISSION 1, ETC and INJ Fuses
Body Control Module (BCM), INTERIOR LIGHTS, ONSTAR, PEDAL and POWER MIRRORS Fuses
Underhood Fuse Block RUN/CRANK Relay, ABS, IGN 1, INJ, ECM IGN 1 and TRANS Fuses
Figure 9:

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


Object Number: 1786209  Size: FS
Master Electrical Component List
Control Module References
Body Control Module (BCM), INTERIOR LIGHTS, ONSTAR, PEDAL and POWER MIRRORS Fuses
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
Underhood Fuse Block RUN/CRANK Relay, ABS, IGN 1, INJ, ECM 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: 1786210  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block IBCM (RUN/CRANK) Fuse, Body Control Module (BCM) AIR BAG (IGN), EPS and RUN/CRANK Fuses
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