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

Underhood Fuse Block B+ Bus


Object Number: 1558349  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block - RUN / CRANK Relay, I/P IGNITION, PRK / NEUT, BCK UP / HTD SEAT, ABS (10A), ECM TRANS, LTR, ABS (30A), EPS, BCM 2, BCM 3, and S-BAND ONSTAR Fuses
Body Control Module - RAP, DRIVERS DOOR UNLOCK PCB, DOOR UNLOCK PCB, DOOR LOCK PCB and INTERIOR LAMPS PCB Relays, RDO, PWR WINDW, DR LCK, INT LIGHT, ECM / TCM, SDM, S ROOF and SPARE Fuses
Figure 2:

Underhood Fuse Block - RUN / CRANK Relay, I/P IGNITION, PRK / NEUT, BCK UP / HTD SEAT, ABS (10A), ECM TRANS, LTR, ABS (30A), EPS, BCM 2, S-BAND ONSTAR Fuses


Object Number: 1558350  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block - LIFTGATE RELEASE, POWERTRAIN Relay, LIFTGATE / SUNROOF, EMISSION, INJ IGN MOD and ECM Fuses
Underhood Fuse Block - B+ Bus
Underhood Fuse Block - B+ Bus
Figure 3:

Underhood Fuse Block - LIFTGATE RELEASE, POWERTRAIN Relay, LIFTGATE / SUNROOF, EMISSION, INJ IGN MOD and ECM Fuses


Object Number: 1558351  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block - LOW BEAM, HIGH BEAM Relays, RT LO BEAM, LT LO BEAM, LT HI BEAM, RT HI BEAM, and HTD SEAT Fuses
Underhood Fuse Block - RUN / CRANK Relay, I/P IGNITION, PRK / NEUT, BCK UP / HTD SEAT, ABS (10A), ECM TRANS, LTR, ABS (30A), EPS, BCM 2, BCM 3, and S-BAND ONSTAR Fuses
Underhood Fuse Block - B+ Bus
Figure 4:

Underhood Fuse Block - LOW BEAM, HIGH BEAM Relays, RT LO BEAM, LT LO BEAM, LT HI BEAM, RT HI BEAM and HTD SEAT Fuses


Object Number: 1558352  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block - ABS (20A), CNSTR VENT, PWR OUTLET and MIR Fuses, PWR SEATS Circuit Breaker
Underhood Fuse Block - LIFTGATE RELEASE, POWERTRAIN Relay, LIFTGATE / SUNROOF, EMISSION, INJ IGN MOD and ECM Fuses
Underhood Fuse Block - B+ Bus
Figure 5:

Underhood Fuse Block - ABS (20A), CNSTR VENT, PWR OUTLET and MIR Fuses and POWER SEATS Circuit Breaker


Object Number: 1558353  Size: FS
Master Electrical Component List
Control Module References
Body Control Module - RAP, DRIVERS DOOR UNLOCK PCB, DOOR UNLOCK PCB, DOOR LOCK PCB and INTERIOR LAMPS PCB Relays, RDO, PWR WINDW, DR LCK, INT LIGHT, ECM / TCM, SDM, S ROOF and SPARE Fuses
Underhood Fuse Block - LOW BEAM, HIGH BEAM Relays, RT LO BEAM, LT LO BEAM, LT HI BEAM, RT HI BEAM, and HTD SEAT Fuses
Underhood Fuse Block - B+ Bus
Figure 6:

Body Control Module -- RAP, DRIVER DOOR UNLOCK PCB, DOOR UNLOCK PCB, DOOR LOCK PCB, and INTERIOR LAMPS PCB Relays, RDO, PWR WINDW, DR LCK, INT LIGHT, ECM / TCM, SDM, S ROOF and SPARE Fuses


Object Number: 1558354  Size: FS
Master Electrical Component List
Control Module References
Body Control Module - BCM 2, HVAC / PK3, CLUSTER, IGN SW, STOP LPS, and AMP Fuses
Underhood Fuse Block - ABS (20A), CNSTR VENT, PWR OUTLET and MIR Fuses, PWR SEATS Circuit Breaker
Power and Grounding Schematic Icons
Underhood Fuse Block - B+ Bus
Figure 7:

Body Control Module -- BCM 2, HVAC/PK3, CLUSTER, IGN SW, STOP LPS, and AMP Fuses


Object Number: 1558358  Size: FS
Master Electrical Component List
Control Module References
Body Control Module - RUN / CRANK and HVAC Relays, I/P IGN, BCM3, WPR, AIR BAG, EPS / STR WHL CNTRL and HVAC / IP IGNITION Fuses
Body Control Module - RAP, DRIVERS DOOR UNLOCK PCB, DOOR UNLOCK PCB, DOOR LOCK PCB and INTERIOR LAMPS PCB Relays, RDO, PWR WINDW, DR LCK, INT LIGHT, ECM / TCM, SDM, S ROOF and SPARE Fuses
Underhood Fuse Block - B+ Bus
Figure 8:

Body Control Module -- RUN / CRANK and HVAC Relays, I/P IGN, BCM 3, WPR, AIR BAG, EPS / STR WHL CNTRL and HVAC / IP IGNITION Fuses


Object Number: 1558360  Size: FS
Master Electrical Component List
Control Module References
Body Control Module - BCM 2, HVAC / PK3, CLUSTER, IGN SW, STOP LPS, and AMP Fuses
Underhood Fuse Block - B+ Bus
Power and Grounding Schematic Icons
Power and Grounding Schematic Icons