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

Underhood Fuse Block B+ Bus - 3.8L


Object Number: 1311988  Size: FS
Master Electrical Component List
Underhood Fuse Block B+ Bus - 4.3L
Rear Fuse Block B+ Bus
G303, G305, G310, and G404
Figure 2:

Underhood Fuse Block B+ Bus - 4.6L


Object Number: 1312058  Size: FS
Master Electrical Component List
Rear Fuse Block B+ Bus
Underhood Fuse Block B+ Bus - 3.8L
Rear Fuse Block B+ Bus
Figure 3:

Rear Fuse Block B+ Bus


Object Number: 1312066  Size: FS
Master Electrical Component List
TRANS, DIS, OXY SEN, and IGN 1 Fuses - 3.8L
Underhood Fuse Block B+ Bus - 4.3L
Underhood Fuse Block B+ Bus - 3.8L
Underhood Fuse Block B+ Bus - 4.3L
Figure 4:

TRANS, DIS, OXY SEN, and IGN 1 Fuses - 3.8L


Object Number: 1220039  Size: FS
Master Electrical Component List
INJR 2, PCM IGN, CR CONT, and INJR 1 Fuses - 3.8L
Rear Fuse Block B+ Bus
Underhood Fuse Block B+ Bus - 3.8L
INJR 2, PCM IGN, CR CONT, and INJR 1 Fuses - 3.8L
Figure 5:

INJR 2, PCM IGN, CR CONT, and INJR 1 Fuses - 3.8L


Object Number: 1341592  Size: FS
Master Electrical Component List
START Circuit Breaker, HORN and A/C CLU Fuses - 3.8L
TRANS, DIS, OXY SEN, and IGN 1 Fuses - 3.8L
TRANS, DIS, OXY SEN, and IGN 1 Fuses - 3.8L
Figure 6:

Start Circuit Breaker, HORN, and A/C CLU Fuses - 3.8L


Object Number: 885286  Size: FS
Master Electrical Component List
DRL, HDHIBML, HDHIBMR, HDLOBML, and HDLOBMR Fuses - 3.8L
INJR 2, PCM IGN, CR CONT, and INJR 1 Fuses - 3.8L
Underhood Fuse Block B+ Bus - 3.8L
Figure 7:

ABS, PCM BATT, and the Cool Fan 1 Fuses - 3.8L


Object Number: 885289  Size: FS
Master Electrical Component List
AIR, C/LTR, AUX PWR, WSW, and ACCY Fuses - 3.8L
DRL, HDHIBML, HDHIBMR, HDLOBML, and HDLOBMR Fuses - 3.8L
Underhood Fuse Block B+ Bus - 3.8L
Figure 8:

AIR, C/LTR, AUX PWR, WSW, and ACCY Fuses - 3.8L


Object Number: 1546684  Size: FS
Master Electrical Component List
OXY SEN, CR CONT, COIL MDL, and TRANS Fuses - 4.6L
ABS, PCM BATT, and COOLFAN 1 Fuses - 3.8L
Figure 9:

OXY SEN, CR CONT, COIL MDL, and TRANS Fuses - 4.6L


Object Number: 1313652  Size: FS
Master Electrical Component List
PCM IGN and IGN 1 Fuses - 4.6L
AIR, C/LTR, AUX PWR, WSW, and ACCY Fuses - 3.8L
Underhood Fuse Block B+ Bus - 3.8L
PCM IGN and IGN 1 Fuses - 4.6L
INGR 1 and INGR 2 Fuses - 4.6L
Figure 10:

PCM IGN and IGN 1 Fuses - 4.6L


Object Number: 1313661  Size: FS
Master Electrical Component List
INGR 1 and INGR 2 Fuses - 4.6L
OXY SEN, CR CONT, COIL MDL, and TRANS Fuses - 4.6L
OXY SEN, CR CONT, COIL MDL, and TRANS Fuses - 4.6L
Figure 11:

INGR1 and INGR2 Fuses - 4.6L


Object Number: 1313667  Size: FS
Master Electrical Component List
ACCY, WSW, HDLOBMR, HDLOBML, HDHIBML, and HDHIBMR Fuses
PCM IGN and IGN 1 Fuses - 4.6L
OXY SEN, CR CONT, COIL MDL, and TRANS Fuses - 4.6L
Figure 12:

ACCY, WSW, HDLOBML, HDLOBMR, HDHIBML, HDHIBMR Fuses


Object Number: 1546690  Size: FS
Master Electrical Component List
PCM BATT, ABS, AIR PUMP, C/LTR1 and C/LTR2 Fuses - 4.6L
INGR 1 and INGR 2 Fuses - 4.6L
Underhood Fuse Block B+ Bus - 3.8L
Underhood Fuse Block B+ Bus - 3.8L
Underhood Fuse Block B+ Bus - 3.8L
Figure 13:

PCM BATT, ABS, AIR PUMP, C/LTR1 and C/LTR2 Fuses - 4.6L


Object Number: 1546692  Size: FS
Master Electrical Component List
HTDST RF, HTDST LF, DIM, and MEM Fuses
ACCY, WSW, HDLOBMR, HDLOBML, HDHIBML, and HDHIBMR Fuses
Underhood Fuse Block B+ Bus - 3.8L
Underhood Fuse Block B+ Bus - 3.8L
Figure 14:

HTDST RF, HTDST LF, DIM, and MEM Fuses


Object Number: 885295  Size: FS
Master Electrical Component List
HVAC BATT, DRV MDL, PASS MDL, and RRDRMDL Fuses
PCM BATT, ABS, AIR PUMP, C/LTR1 and C/LTR2 Fuses - 4.6L
Underhood Fuse Block B+ Bus - 3.8L
Figure 15:

HVAC BATT, DRV MDL, PASS MDL, and RRDRMDL Fuses


Object Number: 885297  Size: FS
Master Electrical Component List
ELC, RR DEFOG, and ALDL Fuses
HTDST RF, HTDST LF, DIM, and MEM Fuses
Underhood Fuse Block B+ Bus - 3.8L
Figure 16:

ELC, RR DEFOG, and ALDL Fuses


Object Number: 1313690  Size: FS
Master Electrical Component List
PWR WDO and PWR SEAT Circuit Breakers
HVAC BATT, DRV MDL, PASS MDL, and RRDRMDL Fuses
Underhood Fuse Block B+ Bus - 3.8L
Figure 17:

PWR WDO and PWR SEAT Circuit Breakers


Object Number: 878549  Size: FS
Master Electrical Component List
LP PKL, LP PKR, and DIMR Fuses
ELC, RR DEFOG, and ALDL Fuses
Underhood Fuse Block B+ Bus - 3.8L
Figure 18:

LP PKL, LP PKR, and DIMR Fuses


Object Number: 1275552  Size: FS
Master Electrical Component List
TSIG/HAZ, STOP LP, AUDIO, and CD Fuses
PWR WDO and PWR SEAT Circuit Breakers
Figure 19:

TSIG/HAZ, STOP LP, AUDIO, and CD Fuses


Object Number: 885303  Size: FS
Master Electrical Component List
I/P and CIGAR Fuses
LP PKL, LP PKR, and DIMR Fuses
Underhood Fuse Block B+ Bus - 3.8L
Figure 20:

I/P and CIGAR Fuses


Object Number: 1546694  Size: FS
Master Electrical Component List
IGN SW and PRK/REV Fuses
TSIG/HAZ, STOP LP, AUDIO, and CD Fuses
Underhood Fuse Block B+ Bus - 3.8L
Figure 21:

IGN SW and PRK/REV Fuses


Object Number: 885309  Size: FS
Master Electrical Component List
Ignition Switch Positions
I/P and CIGAR Fuses
Underhood Fuse Block B+ Bus - 3.8L
Ignition Switch Positions
Backup Lamps
Figure 22:

Ignition Switch Positions


Object Number: 1275559  Size: FS
Master Electrical Component List
Ignition Switch RUN and START/RUN Positions
IGN SW and PRK/REV Fuses
IGN SW and PRK/REV Fuses
Ignition Switch RUN and START/RUN Positions
Ignition Switch RUN and START/RUN Positions
Figure 23:

Ignition Switch RUN and START/RUN Positions


Object Number: 885312  Size: FS
Master Electrical Component List
IGN-1, VENT SOL, and SIR Fuses
Ignition Switch Positions
Ignition Switch Positions
Ignition Switch Positions
Figure 24:

IGN-1, VENT SOL, and SIR Fuses


Object Number: 1257458  Size: FS
Master Electrical Component List
IGN3 RR and ABS Fuses
Ignition Switch RUN and START/RUN Positions
SIR Caution for Zoning
Figure 25:

IGN 3 RR and ABS Fuses


Object Number: 1257478  Size: FS
Master Electrical Component List
HVAC Fuse
IGN-1, VENT SOL, and SIR Fuses
Figure 26:

HVAC Fuse


Object Number: 1523344  Size: FS
Master Electrical Component List
HVAC BLO, AUDIO AMP, and SDAR Fuses
IGN3 RR and ABS Fuses
Figure 27:

HVAC BLO, AUDIO AMP, and SDAR Fuses


Object Number: 867693  Size: FS
Master Electrical Component List
HVAC Fuse
Underhood Fuse Block B+ Bus - 3.8L
Underhood Fuse Block B+ Bus - 3.8L