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

Underhood Fuse Block B+ Bus 1 of 2


Object Number: 1788488  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
Figure 2:

Underhood Fuse Block B+ Bus 2 of 2


Object Number: 1788493  Size: FS
Master Electrical Component List
Control Module References
Left Rear Fuse Block B+ Bus
Underhood Fuse Block B+ 1 of 2
Underhood Fuse Block B+ 1 of 2
Figure 3:

Left Rear Fuse Block B+ Bus


Object Number: 1788511  Size: FS
Master Electrical Component List
Control Module References
Right Rear Fuse Block B+ Bus
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ 1 of 2
Figure 4:

Right Rear Fuse Block B+ Bus


Object Number: 1788712  Size: FS
Master Electrical Component List
Control Module References
Ignition Switch 1 of 2
Left Rear Fuse Block B+ Bus
Underhood Fuse Block B+ BUS 2 of 2
Figure 5:

Ignition Switch 1 of 2


Object Number: 1788717  Size: FS
Master Electrical Component List
Control Module References
Ignition Switch 2 of 2
Right Rear Fuse Block B+ Bus
Underhood Fuse Block B+ BUS 2 of 2
Figure 6:

Ignition Switch 2 of 2


Object Number: 1788721  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block Park Lamp Relay/Fuses and Dimming Fuses
Ignition Switch 1 of 2
Right Rear Fuse Block - DR MOD PWR Circuit Breaker, CANISTER VENT, RIM/IGN SW, R FRT HTD SEAT MOD, and POWER SOUNDER Fuses
Figure 7:

Underhood Fuse Block - PARK LAMP Relay/Fuses and DIMMING Fuse


Object Number: 1788732  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block Cooling Fan Fuses/Relays, Main Relay, ECM, and TOS
Ignition Switch 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
Figure 8:

Underhood Fuse Block - COOLING FAN Fuses/Relays, MAIN Relay, ECM, and TOS


Object Number: 1788740  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block Pre O2/CAM Fuse
Underhood Fuse Block Park Lamp Relay/Fuses and Dimming Fuses
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block Pre O2/CAM Fuse
Figure 9:

Underhood Fuse Block - PRE 02/CAM Fuse


Object Number: 1788745  Size: FS
Master Electrical Component List
Control Module References
Wiring Systems and Power Management Power Distribution Underhood Fuse Block Post O2 Fuse
Underhood Fuse Block Cooling Fan Fuses/Relays, Main Relay, ECM, and TOS
Underhood Fuse Block Cooling Fan Fuses/Relays, Main Relay, ECM, and TOS
Wiring Systems and Power Management Power Distribution Underhood Fuse Block Post O2 Fuse
Figure 10:

Underhood Fuse Block - POST 02 Fuse


Object Number: 1788751  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block Odd INJ/Coil Fuse
Underhood Fuse Block Pre O2/CAM Fuse
Underhood Fuse Block Pre O2/CAM Fuse
Underhood Fuse Block Odd INJ/Coil Fuse
Figure 11:

Underhood Fuse Block - ODD INJ/COIL Fuse


Object Number: 1788761  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block Even INJ/Coil Fuse
Wiring Systems and Power Management Power Distribution Underhood Fuse Block Post O2 Fuse
Wiring Systems and Power Management Power Distribution Underhood Fuse Block Post O2 Fuse
Underhood Fuse Block Even INJ/Coil Fuse
Figure 12:

Underhood Fuse Block - EVEN INJ/COIL Fuse


Object Number: 1788764  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block DIM/ALDL, Volt Check, Flasher, CCP, ECM/TCM, and ABS Fuses
Underhood Fuse Block Odd INJ/Coil Fuse
Underhood Fuse Block Odd INJ/Coil Fuse
Figure 13:

Underhood Fuse Block - DIM/ALDL, VOLT CHECK, FLASHER, CCP, ECM/TCM, and ABS Fuses


Object Number: 1788772  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block Headlamp Relays/Fuses, Accessory relay, I/P Outlet, Outlet, Wiper Module, Wiperswitch, and Elec PRNDL Fuses
Underhood Fuse Block Even INJ/Coil Fuse
Underhood Fuse Block B+ BUS 2 of 2
Figure 14:

Underhood Fuse Block - Headlamp Relays/Fuses, ACCESSORY Relay, I/P OUTLET, OUTLET, WPR MOD, WPR SW, and ELEC PRNDL Fuses


Object Number: 1788774  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block Starter Relay, IGN 1 Relay, HTR VLV/Clutch and TCM/IPC Fuses
Underhood Fuse Block DIM/ALDL, Volt Check, Flasher, CCP, ECM/TCM, and ABS Fuses
Underhood Fuse Block B+ BUS 2 of 2
Figure 15:

Underhood Fuse Block - STARTER Relay, IGN 1 Relay, HTR VLV/CLUTCH, and TCM/IPC Fuses


Object Number: 1788779  Size: FS
Master Electrical Component List
Control Module References
Underhood Fuse Block Wash noz, Strg (TL) and IGN MOD/MAF Fuses
Underhood Fuse Block Headlamp Relays/Fuses, Accessory relay, I/P Outlet, Outlet, Wiper Module, Wiperswitch, and Elec PRNDL Fuses
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block Wash noz, Strg (TL) and IGN MOD/MAF Fuses
Figure 16:

Underhood Fuse Block - WASH NOZ, STRG CTLS, and IGN MOD/MAF Fuses


Object Number: 1788785  Size: FS
Master Electrical Component List
Control Module References
Left Rear Fuse Block Ign 3 Relay, LFRT HTD Seat MOD, MEM/ADAPT Seat, CCP, HDLP Leveling and IGN 3 Fuses
Underhood Fuse Block Starter Relay, IGN 1 Relay, HTR VLV/Clutch and TCM/IPC Fuses
Underhood Fuse Block Starter Relay, IGN 1 Relay, HTR VLV/Clutch and TCM/IPC Fuses
Power and Grounding Schematic Icons
Figure 17:

Left Rear Fuse Block - IGN 3 Relay, L FRT HTD SEAT MOD, MEM/ADAPT SEAT, CCP, HDLP LEVELING, and IGN 3 Fuses


Object Number: 1788792  Size: FS
Master Electrical Component List
Control Module References
Left Rear Fuse Block Seat Circuit Breaker, Trunk Relay/Fuse, Amp, Audio, Driver Dr MOD, and Rear DR MOD Fuse
Underhood Fuse Block Wash noz, Strg (TL) and IGN MOD/MAF Fuses
Underhood Fuse Block B+ BUS 2 of 2
Figure 18:

Left Rear Fuse Block - SEAT Circuit Breaker, TRUNK Relay/Fuse, AMP, AUDIO, DRIVER DR MOD, and REAR DR MOD Fuses


Object Number: 1788795  Size: FS
Master Electrical Component List
Control Module References
Right Rear Fuse Block IGN 1 Relay, Airbag, RIM, ABS, PSGR DR MOD, and TV/VICS Fuses
Left Rear Fuse Block Ign 3 Relay, LFRT HTD Seat MOD, MEM/ADAPT Seat, CCP, HDLP Leveling and IGN 3 Fuses
Underhood Fuse Block B+ BUS 2 of 2
Figure 19:

Right Rear Fuse Block - IGN 1 Relay, AIR BAG, RIM, ABS, PSGR DR MOD, and TV/VICS Fuses


Object Number: 1788796  Size: FS
Master Electrical Component List
Control Module References
Right Rear Fuse Block, DR MOD PWR Circuit Breaker Canister Vent, RIM/IGN SW., FRT HTD Seat MOD, and PWR Sander Fuses
Left Rear Fuse Block Seat Circuit Breaker, Trunk Relay/Fuse, Amp, Audio, Driver Dr MOD, and Rear DR MOD Fuse
Underhood Fuse Block B+ BUS 2 of 2
Figure 20:

Right Rear Fuse Block - DR MOD PWR Circuit Breaker, CANISTER VENT, RUM/IGN SW, R FRT HTD SEAT MOD, and POWER SOUNDER Fuses


Object Number: 1788801  Size: FS
Master Electrical Component List
Control Module References
Right Rear Fuse Block IGN 1 Relay, Airbag, RIM, ABS, PSGR DR MOD, and TV/VICS Fuses
Underhood Fuse Block B+ BUS 2 of 2