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

B+ Bus


Object Number: 1804675  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block IBCM1, 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: 1804677  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block RBEC1 and Rear Fuse Block , BCK/UP Lamps, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM RR DEFOG and S/ROOF Fuses
B+ Bus
B+ Bus
Power and Grounding Schematic Icons
Figure 3:

Underhood Fuse Block RBEC 1 and Rear Fuse Block, AUDIO AMP, BCK/UP LAMPS, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM RR DEFOG and S/ROOF Fuses


Object Number: 1804679  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block RUN RLY, RBEC2, Body Control Module (BCM), HVAC BLOWER, HVAC CTRL (IGN) Rear Fuse Block, DRV ST, EMISSION 2, FUEL PUMP, PARK LAMPS and TRUNK Fuses
Underhood Fuse Block IBCM1, Body Control Module (BCM) AIRBAG (BATT), CLUSTER/THEFT, HVAC CTRL (BATT), IGN SENSOR and RADIO Fuses
B+ Bus
Underhood Fuse Block RUN RLY, RBEC2, Body Control Module (BCM), HVAC BLOWER, HVAC CTRL (IGN) Rear Fuse Block, DRV ST, EMISSION 2, FUEL PUMP, PARK LAMPS and TRUNK Fuses
Figure 4:

Underhood Fuse Block RUN RLY, RBEC2, Body Control Module (BCM), HVAC BLOWER, HVAC CTRL (IGN) Rear Fuse Block, DRV ST, EMISSION 2, FUEL PUMP, PARK LAMPS and TRUNK Fuses


Object Number: 1804680  Size: FS
Master Electrical Component List
Control Module References
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, ECM, and TCM Fuses
Underhood Fuse Block RBEC1 and Rear Fuse Block , BCK/UP Lamps, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM RR DEFOG and S/ROOF Fuses
B+ Bus
Underhood Fuse Block RBEC1 and Rear Fuse Block , BCK/UP Lamps, CIG/AUX, HTD MIR, HTD SEAT, RKE/XM RR DEFOG and S/ROOF Fuses
Figure 5:

Underhood Fuse Block DRL, HI/BEAM and LO/BEAM Relays, ABS, DRL, EPS, IBCM1, IBCM2, LT HI BEAM, LT LOW BEAM, RT HI BEAM, RT LOW BEAM, ECM and TCM Fuses


Object Number: 1804684  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block RUN/CRANK Relay, ABS, BAS PMP MAF, ECM IGN 1, IGN 1 ECM IGN 1 BAS IGN and TRANS Fuses
Underhood Fuse Block RUN RLY, RBEC2, Body Control Module (BCM), HVAC BLOWER, HVAC CTRL (IGN) Rear Fuse Block, DRV ST, EMISSION 2, FUEL PUMP, PARK LAMPS and TRUNK Fuses
B+ Bus
Figure 6:

Underhood Fuse Block RUN/CRANK Relay, ABS, BAS PMP MAF, ECM IGN 1, IGN 1 ECM IGN 1 BAS IGN, and TRANS Fuses


Object Number: 1804689  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block A/C Clutch and PWR/TRN Relays, A/C CLU, EMISSION 1, INJ/COIL ODD/IGN/MOD, INJECTORS INJ COIL/EVEN and POST 02 Fuses and ETC 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, ECM, and TCM Fuses
B+ Bus
Figure 7:

Underhood Fuse Block A/C CLUTCH and PWR/TRN Relays, A/C CLU, ETC, EMISSION 1, INJ/COIL/ODD/IGN/MOD, INJECTORS INJ COIL/EVEN and POST O2 Fuses


Object Number: 1804718  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block IBCM 2, BATTERY SENSE, Body Control Module (BCM), ACCESSORY Relay, DOOR LOCK, INTERIOR LIGHTS, POWER WINDOWS, ROOF/HEAT SEAT and WIPER SW Fuses
Underhood Fuse Block RUN/CRANK Relay, ABS, BAS PMP MAF, ECM IGN 1, IGN 1 ECM IGN 1 BAS IGN and TRANS Fuses
B+ Bus
Figure 8:

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


Object Number: 1804720  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, INJ/COIL ODD/IGN/MOD, INJECTORS INJ COIL/EVEN and POST 02 Fuses and ETC Fuses
B+ Bus
Figure 9:

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


Object Number: 1804724  Size: FS
Master Electrical Component List
Control Module References
Body Control Module (BCM), ONSTAR, PEDAL and POWER MIRRORS Fuses
Underhood Fuse Block IBCM 2, BATTERY SENSE, Body Control Module (BCM), ACCESSORY Relay, DOOR LOCK, INTERIOR LIGHTS, POWER WINDOWS, ROOF/HEAT SEAT and WIPER SW Fuses
Underhood Fuse Block RUN/CRANK Relay, ABS, BAS PMP MAF, ECM IGN 1, IGN 1 ECM IGN 1 BAS IGN and TRANS Fuses
Power and Grounding Schematic Icons
Power and Grounding Schematic Icons
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: 1804726  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, BATTERY SENSE, Body Control Module (BCM), ACCESSORY Relay, DOOR LOCK, INTERIOR LIGHTS, POWER WINDOWS, ROOF/HEAT SEAT and WIPER SW Fuses