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

Battery Feed to Underhood Fuse Block


Object Number: 661656  Size: FS
Master Electrical Component List
Battery Feed to Rear Fuse Block
G305, G310, G404, and G303
Battery Feed to Rear Fuse Block
Figure 2:

Battery Feed to Rear Fuse Block


Object Number: 661657  Size: FS
Master Electrical Component List
IGN 1 Relay, Transmission, DIS, OXY SEN, and IGN 1 Fuses (Fuse Block Underhood)
Battery Feed to Underhood Fuse Block
Figure 3:

IGN 1 Relay, Transmission, DIS, OXY SEN, and IGN 1 Fuses (Fuse Block Underhood)


Object Number: 661660  Size: FS
Master Electrical Component List
Start 1 Relay, INJR 2, PCM IGN, CR CONT, and INJR 2 Fuses (Fuse Block - Underhood)
Battery Feed to Rear Fuse Block
High and Low Beam Relays, ABS, PCM BATT, High and Low Beam Relays (Fuse Block Underhood)
Start 1 Relay, INJR 2, PCM IGN, CR CONT, and INJR 2 Fuses (Fuse Block - Underhood)
Figure 4:

Start 1 Relay,INJR 2, PCM IGN, CR CONT, and INJR 2 Fuses (Fuse Block Underhood)


Object Number: 661673  Size: FS
Master Electrical Component List
High and Low Beam Relays, ABS, PCM BATT, High and Low Beam Relays (Fuse Block Underhood)
IGN 1 Relay, Transmission, DIS, OXY SEN, and IGN 1 Fuses (Fuse Block Underhood)
IGN 1 Relay, Transmission, DIS, OXY SEN, and IGN 1 Fuses (Fuse Block Underhood)
Figure 5:

High and Low Beam Relays, ABS, PCM BATT, High and Low Beam Relays (Fuse Block Underhood)


Object Number: 661684  Size: FS
Master Electrical Component List
AIR Pump and ACCY Relays, AIR, C/LTR, AUX PWR, WSW, and ACCY Fuses(Fuse Block Underhood)
Start 1 Relay, INJR 2, PCM IGN, CR CONT, and INJR 2 Fuses (Fuse Block - Underhood)
AIR Pump and ACCY Relays, AIR, C/LTR, AUX PWR, WSW, and ACCY Fuses(Fuse Block Underhood)
Figure 6:

AIR Pump and ACCY Relays, AIR, C/LTR, AUX PWR, WSW, and ACCY Fuses (Fuse Block Underhood)


Object Number: 661689  Size: FS
Master Electrical Component List
HTDST RF, HTDST LF, DIM, and MEM Fuses (Fuse Block Rear)
High and Low Beam Relays, ABS, PCM BATT, High and Low Beam Relays (Fuse Block Underhood)
Figure 7:

HTDST RF, HTDST LF,DIM, and MEM Fuses (Fuse Block Rear)


Object Number: 661692  Size: FS
Master Electrical Component List
HVAC BATT, DDM, FPDM, LRDM Fuses (Fuse Block Rear)
AIR Pump and ACCY Relays, AIR, C/LTR, AUX PWR, WSW, and ACCY Fuses(Fuse Block Underhood)
ELC, RR DEFOG and TRK/REL Relays, RR DEFOG and ALDL Fuses (Fuse Block Rear)
Figure 8:

HVAC BATT, DDM, FPDM, LRDM Fuses (Fuse Block Rear)


Object Number: 661694  Size: FS
Master Electrical Component List
ELC, RR DEFOG and TRK/REL Relays, RR DEFOG and ALDL Fuses (Fuse Block Rear)
HTDST RF, HTDST LF, DIM, and MEM Fuses (Fuse Block Rear)
Figure 9:

ELC, RR DEFOG and TRK/REL Relays, RR DEFOG and ALDL Fuses (Fuse Block Rear)


Object Number: 661804  Size: FS
Master Electrical Component List
PWR WDO and PWR SEAT Circuit Breakers (Fuse Block Rear)
HVAC BATT, DDM, FPDM, LRDM Fuses (Fuse Block Rear)
Figure 10:

PWR WDO and PWR SEAT Circuit Breakers (Fuse Block Rear)


Object Number: 661832  Size: FS
Master Electrical Component List
PRK LP Relay, LP PK L, LP PK R, and DIMR Fuses (Fuse Block Rear)
ELC, RR DEFOG and TRK/REL Relays, RR DEFOG and ALDL Fuses (Fuse Block Rear)
Figure 11:

PRK LP Relay, LP PK L, LP PK R, and DIMR Fuses (Fuse Block Rear)


Object Number: 661835  Size: FS
Master Electrical Component List
T SIG/HAZ, STOP LP, AUDIO and CD Fuses (Fuse Block Rear)
PWR WDO and PWR SEAT Circuit Breakers (Fuse Block Rear)
Figure 12:

T SIG/HAZ, STOP LP, AUDIO and CD Fuses (Fuse Block Rear)


Object Number: 661841  Size: FS
Master Electrical Component List
AUDIO (On Star) Fuse (Fuse Block Rear)
PRK LP Relay, LP PK L, LP PK R, and DIMR Fuses (Fuse Block Rear)
AUDIO (On Star) Fuse (Fuse Block Rear)
Figure 13:

AUDIO (On Star) Fuse (Fuse Block Rear)


Object Number: 661847  Size: FS
Master Electrical Component List
IP, CIGAR, AUX PWR and C/LTR Fuses and CIGAR Relay (Fuse Block Rear)
T SIG/HAZ, STOP LP, AUDIO and CD Fuses (Fuse Block Rear)
G401 (2 of 2)
Battery Feed to Rear Fuse Block
Battery Feed to Rear Fuse Block
Serial Data Class 2
Figure 14:

IP, CIGAR, AUX PWR and C/LTR Fuses and CIGAR Relay (Fuse Block Rear)


Object Number: 661849  Size: FS
Master Electrical Component List
IGN SW and NSBU Fuses (Fuse Block Rear)
AUDIO (On Star) Fuse (Fuse Block Rear)
Figure 15:

IGN SW and NSBU Fuses (Fuse Block Rear)


Object Number: 661855  Size: FS
Master Electrical Component List
Ignition Switch (1 of 2)
IP, CIGAR, AUX PWR and C/LTR Fuses and CIGAR Relay (Fuse Block Rear)
Backup Lights
Ignition Switch (1 of 2)
Figure 16:

Ignition Switch (1 of 2)


Object Number: 661860  Size: FS
Master Electrical Component List
Ignition Switch (2 of 2)
IGN SW and NSBU Fuses (Fuse Block Rear)
IGN SW and NSBU Fuses (Fuse Block Rear)
Ignition Switch (2 of 2)
Figure 17:

Ignition Switch (2 of 2)


Object Number: 661864  Size: FS
Master Electrical Component List
IGN-1, VENT SOL, and SIR Fuses (Fuse Block Rear)
Ignition Switch (1 of 2)
Ignition Switch (1 of 2)
Figure 18:

IGN-1, VENT SOL, and SIR Fuses (Fuse Block Rear)


Object Number: 661873  Size: FS
Master Electrical Component List
IGN-3 and ABS Fuses (Fuse Block Rear)
Ignition Switch (2 of 2)
Figure 19:

IGN-3 and ABS Fuses (Rear Fuse Block)


Object Number: 661883  Size: FS
Master Electrical Component List
HVAC Fuse (Block Rear)
IGN-1, VENT SOL, and SIR Fuses (Fuse Block Rear)
Battery Feed to Rear Fuse Block
HVAC Fuse (Block Rear)
Figure 20:

HVAC Fuse (Rear Fuse Block)


Object Number: 661888  Size: FS
Master Electrical Component List
HVAC BLO and AUDIO Fuses, RAP and F/PMP Relays (Block Rear)
IGN-3 and ABS Fuses (Fuse Block Rear)
IGN-3 and ABS Fuses (Fuse Block Rear)
Figure 21:

HVAC BLO and AUDIO Fuses, RAP and F/PMP Relays (Block Rear)


Object Number: 661893  Size: FS
Master Electrical Component List
HVAC Fuse (Block Rear)