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

Underhood Fuse Block B+ Bus


Object Number: 1794143  Size: FS
Master Electrical Component List
Control Module References
Rear Fuse Block B+
Rear Fuse Block B+
PWR/TRAIN, AIR PUMP, AIR/SOL Relays, ECM/CRNK, INJ/COIL, PWR TRN, AIR PUMP, AIR/SOL Fuses
Figure 2:

Rear Fuse Block B+ Bus


Object Number: 1794195  Size: FS
Master Electrical Component List
Control Module References
HORN, WSH, HIGH/BEAM, LO/BEAM Relays, HORN, ABS 1, ABS 2, WSW/PUMP, WSW HTD, HI BEAM, LT LO BEAM, RT LO BEAM Fuses
Underhood Fuse Block B+
Underhood Fuse Block B+
Figure 3:

Underhood Fuse Block - HORN, WSH, HIGH/BEAM, LO/BEAM Relays, HORN, ABS 1, ABS 2, WSW/PUMP, WSW HTD, HI BEAM, LT LO BEAM, RT LO BEAM Fuses


Object Number: 1794198  Size: FS
Master Electrical Component List
Control Module References
TRN/SIG, FOG LAMP, TRN/SIG Relays, LT CRN LAMP, FOG, RT CRN LAMP Fuses
Rear Fuse Block B+
Underhood Fuse Block B+
PRK LAMP, DRL Relays, IP HARN MDL, LT PRK LAMP, RT PRK LAMP, DRL Fuses
Figure 4:

Underhood Fuse Block - TRN/SIG, FOG LAMP, TRN/SIG Relays, LT CRN LAMP, FOG, RT CRN LAMP Fuses


Object Number: 1794201  Size: FS
Master Electrical Component List
Control Module References
RUN/CRANK Relay, TRANS IGN 3, AIRBAG IGN 3, HVAC/IPC, ECM IGN 3 Fuses
HORN, WSH, HIGH/BEAM, LO/BEAM Relays, HORN, ABS 1, ABS 2, WSW/PUMP, WSW HTD, HI BEAM, LT LO BEAM, RT LO BEAM Fuses
Underhood Fuse Block B+
Figure 5:

Underhood Fuse Block - RUN/CRANK Relay, TRANS IGN 3, AIRBAG IGN 3, HVAC/IPC, ECM IGN 3 Fuses


Object Number: 1794208  Size: FS
Master Electrical Component List
Control Module References
PWR/TRAIN, AIR PUMP, AIR/SOL Relays, ECM/CRNK, INJ/COIL, PWR TRN, AIR PUMP, AIR/SOL Fuses
TRN/SIG, FOG LAMP, TRN/SIG Relays, LT CRN LAMP, FOG, RT CRN LAMP Fuses
IGN SWTCH, STR/WHL/ILLUM Fuses
Power and Grounding Schematic Icons
Figure 6:

Underhood Fuse Block - PWR/TRAIN, AIR PUMP, AIR/SOL Relays, AIR PUMP, AIR/SOL, ECM/CRNK, INJ/COIL, PWR TRN Fuses


Object Number: 1794284  Size: FS
Master Electrical Component List
Control Module References
AIR PUMP, AIR/SOL, A/C, COOL/FAN 2, COOL/FAN, COOL/FAN 1 Relays, INJ/COIL, OXY PST Fuses
RUN/CRANK Relay, TRANS IGN 3, AIRBAG IGN 3, HVAC/IPC, ECM IGN 3 Fuses
Underhood Fuse Block B+
Underhood Fuse Block B+
AIR PUMP, AIR/SOL, A/C, COOL/FAN 2, COOL/FAN, COOL/FAN 1 Relays, INJ/COIL, OXY PST Fuses
Figure 7:

Underhood Fuse Block - AIR PUMP, AIR/SOL, A/C, COOL/FAN 2, COOL/FAN, COOL FAN 1 Relays, INJ/COIL, OXY PST Fuses


Object Number: 1794450  Size: FS
Master Electrical Component List
Control Module References
LT TRN/SIG, RR TRN/SIG, CHMSL/BCK-UP, INT LAMPS, SWTCH DM, HVAC BLWR Fuses, DR MDL/PWR WNDW Circuit Breaker
PWR/TRAIN, AIR PUMP, AIR/SOL Relays, ECM/CRNK, INJ/COIL, PWR TRN, AIR PUMP, AIR/SOL Fuses
PWR/TRAIN, AIR PUMP, AIR/SOL Relays, ECM/CRNK, INJ/COIL, PWR TRN, AIR PUMP, AIR/SOL Fuses
Figure 8:

Rear Fuse Block - LT TRN/SIG, RR TRN/SIG, CHMSL/BCK-UP, INT LAMPS, SWTCH DM, HVAC BLWR Fuses, DR MDL/PWR WNDW Circuit Breaker


Object Number: 1794456  Size: FS
Master Electrical Component List
Control Module References
PRK LAMP, DRL Relays, IP HARN MDL, LT PRK LAMP, RT PRK LAMP, DRL Fuses
AIR PUMP, AIR/SOL, A/C, COOL/FAN 2, COOL/FAN, COOL/FAN 1 Relays, INJ/COIL, OXY PST Fuses
Rear Fuse Block B+
Figure 9:

Rear Fuse Block - PRK LAMP, DRL Relays, IP HARN MDL, LT PRK LAMP, RT PRK LAMP, DRL Fuses


Object Number: 1794469  Size: FS
Master Electrical Component List
Control Module References
AIR BAG, OBJ SNSR, ONSTAR/S-BAND, BODY HARN MDL Fuses
LT TRN/SIG, RR TRN/SIG, CHMSL/BCK-UP, INT LAMPS, SWTCH DM, HVAC BLWR Fuses, DR MDL/PWR WNDW Circuit Breaker
Rear Fuse Block B+
HORN, WSH, HIGH/BEAM, LO/BEAM Relays, HORN, ABS 1, ABS 2, WSW/PUMP, WSW HTD, HI BEAM, LT LO BEAM, RT LO BEAM Fuses
Power and Grounding Schematic Icons
Power and Grounding Schematic Icons
Figure 10:

Rear Fuse Block - AIR BAG, OBJ SNSR, ONSTAR/S-BAND, BODY HARN MDL Fuses


Object Number: 1794493  Size: FS
Master Electrical Component List
Control Module References
TRUNK RELSE Relay, AUX PWR, CNSTR VENT, RVC SENSE, ELC MDL, MRTD MDL, TRUNK RELSE Fuses
PRK LAMP, DRL Relays, IP HARN MDL, LT PRK LAMP, RT PRK LAMP, DRL Fuses
Rear Fuse Block B+
Power and Grounding Schematic Icons
Figure 11:

Rear Fuse Block - TRUNK RELSE Relay, AUX PWR, AUX PWR, CNSTR VENT, RVC SENSE, ELC MDL, MRTD MDL, TRUNK RELSE Fuses


Object Number: 1794504  Size: FS
Master Electrical Component List
Control Module References
MSM/RT FRT PWR SEAT, MSM/LT FRT PWR SEAT, MSM Circuit Breakers, ECM/TCM, MSM LOGIC/RF MASSAGE Fuses
AIR BAG, OBJ SNSR, ONSTAR/S-BAND, BODY HARN MDL Fuses
Rear Fuse Block B+
Figure 12:

Rear Fuse Block - MSM/RT FRT PWR SEAT, MSM/LT FRT PWR SEAT, MSM Circuit Breakers, ECM/TCM, MSM LOGIC/RF MASSAGE Fuses


Object Number: 1794518  Size: FS
Master Electrical Component List
Control Module References
RAP Relay, CTSY/RF TRN, S/ROOF, SHFTR SOL, RAP Fuses
TRUNK RELSE Relay, AUX PWR, CNSTR VENT, RVC SENSE, ELC MDL, MRTD MDL, TRUNK RELSE Fuses
Rear Fuse Block B+
Figure 13:

Rear Fuse Block - RAP Relay, CTSY/RF TRN, S/ROOF, SHFTR SOL, RAP Fuses


Object Number: 1794534  Size: FS
Master Electrical Component List
Control Module References
HTD/COOL, DDM, PDM, RDO, AMP Fuses
MSM/RT FRT PWR SEAT, MSM/LT FRT PWR SEAT, MSM Circuit Breakers, ECM/TCM, MSM LOGIC/RF MASSAGE Fuses
Rear Fuse Block B+
IGN SWTCH, STR/WHL/ILLUM Fuses
Figure 14:

Rear Fuse Block - HTD/COOL, DDM, PDM, RDO, AMP Fuses


Object Number: 1794543  Size: FS
Master Electrical Component List
Control Module References
RUN Relay, HTD STR, HTD/COOL/IGN3, BCM LOGIC Fuses
RAP Relay, CTSY/RF TRN, S/ROOF, SHFTR SOL, RAP Fuses
Rear Fuse Block B+
Figure 15:

Rear Fuse Block - RUN Relay, HTD STR, HTD/COOL/IGN3, BCM LOGIC Fuses


Object Number: 1794552  Size: FS
Master Electrical Component List
Control Module References
IGN SWTCH, STR/WHL/ILLUM Fuses
HTD/COOL, DDM, PDM, RDO, AMP Fuses
Rear Fuse Block B+
Power and Grounding Schematic Icons
Figure 16:

Rear Fuse Block - IGN SWITCH, STR/WHL/ILLUM Fuses


Object Number: 1794560  Size: FS
Master Electrical Component List
Control Module References
RUN Relay, HTD STR, HTD/COOL/IGN3, BCM LOGIC Fuses
Rear Fuse Block B+
Power and Grounding Schematic Icons
RUN/CRANK Relay, TRANS IGN 3, AIRBAG IGN 3, HVAC/IPC, ECM IGN 3 Fuses
RAP Relay, CTSY/RF TRN, S/ROOF, SHFTR SOL, RAP Fuses