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

B+ Bus


Object Number: 2003446  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - Underhood ALTERNATOR, EF1, EF3, EF5, EF18, EF19, Ef27, EF30, EF31 Fuses and POWER WINDOW, ENGINE MAIN Relays
Figure 2:

Fuse Block - Underhood ALTERNATOR, EF1, EF3, EF5, EF18, EF19, EF27, EF30, EF31 Fuses and POWER WINDOW, ENGINE MAIN Relays


Object Number: 2003448  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - Auxiliary Underhood - Diesel
B+ Bus
B+ Bus
Fuse Block - Underhood EF33 Fuse
Fuse Block - Auxiliary Underhood - Diesel
Fuse Block - Auxiliary Underhood - Diesel
Figure 3:

Fuse Block - Auxiliary Underhood - Diesel


Object Number: 2003451  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - Underhood EF33 Fuse
Fuse Block - Underhood ALTERNATOR, EF1, EF3, EF5, EF18, EF19, Ef27, EF30, EF31 Fuses and POWER WINDOW, ENGINE MAIN Relays
Fuse Block - Underhood EF33 Fuse
Fuse Block - Underhood ALTERNATOR, EF1, EF3, EF5, EF18, EF19, Ef27, EF30, EF31 Fuses and POWER WINDOW, ENGINE MAIN Relays
Figure 4:

Fuse Block - Underhood EF33 Fuse


Object Number: 2003452  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - Underhood EF2, EF4, EF8, EF15, EF20, EF22, EF24, EF25 Fuses and ILLUMINATION, STARTER Relays
Fuse Block - Auxiliary Underhood - Diesel
Fuse Block - Underhood ALTERNATOR, EF1, EF3, EF5, EF18, EF19, Ef27, EF30, EF31 Fuses and POWER WINDOW, ENGINE MAIN Relays
B+ Bus
Fuse Block - Auxiliary Underhood - Diesel
Figure 5:

Fuse Block - Underhood EF2, EF4, EF8, EF15, EF20, EF22, EF24, EF25 Fuses and ILLUMINATION, STARTER Relays


Object Number: 2003455  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - Underhood EF17, EF21, EF23, EF35, EF36, EF37 Fuses and HEADLAMP LOW, HEADLAMP HIGH Relays
Fuse Block - Underhood EF33 Fuse
B+ Bus
Ignition Switch
Fuse Block - I/P F8, F9, F15, F22, F23 Fuses
Figure 6:

Fuse Block - Underhood EF17, EF21, EF23, EF35, EF36, EF37 Fuses and HEADLAMP LOW, HEADLAMP HIGH Relays


Object Number: 2003456  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - Underhood EF26, EF28 Fuses and FUEL PUMP Relay
Fuse Block - Underhood EF2, EF4, EF8, EF15, EF20, EF22, EF24, EF25 Fuses and ILLUMINATION, STARTER Relays
B+ Bus
Fuse Block - I/P F4, F13, F21 Fuses
Figure 7:

Fuse Block - Underhood EF26, EF28 Fuses and FUEL PUMP Relay


Object Number: 2003457  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - I/P F8, F9, F15, F22, F23 Fuses
Fuse Block - Underhood EF17, EF21, EF23, EF35, EF36, EF37 Fuses and HEADLAMP LOW, HEADLAMP HIGH Relays
B+ Bus
Figure 8:

Fuse Block - I/P F8, F9, F15, F22, F23 Fuses


Object Number: 2003458  Size: FS
Master Electrical Component List
Control Module References
Ignition Switch
Fuse Block - Underhood EF26, EF28 Fuses and FUEL PUMP Relay
Fuse Block - Underhood EF2, EF4, EF8, EF15, EF20, EF22, EF24, EF25 Fuses and ILLUMINATION, STARTER Relays
Figure 9:

Ignition Switch


Object Number: 2003459  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - I/P F10, F16, F17 Fuses
Fuse Block - I/P F8, F9, F15, F22, F23 Fuses
Fuse Block - Underhood EF2, EF4, EF8, EF15, EF20, EF22, EF24, EF25 Fuses and ILLUMINATION, STARTER Relays
Figure 10:

Fuse Block - I/P F10, F16, F17 Fuses


Object Number: 2003461  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - I/P F1, F2, F3, F11, F12, F18 Fuses
Ignition Switch
Ignition Switch
SIR Caution for Zoning
Figure 11:

Fuse Block - I/P F1, F2, F3, F11, F12, F18 Fuses


Object Number: 2003462  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - I/P F4, F13, F21 Fuses
Fuse Block - I/P F10, F16, F17 Fuses
Ignition Switch
Figure 12:

Fuse Block - I/P F4, F13, F21 Fuses


Object Number: 2003464  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - I/P F5, F6, F7, F14 Fuses
Fuse Block - I/P F1, F2, F3, F11, F12, F18 Fuses
Fuse Block - Underhood EF17, EF21, EF23, EF35, EF36, EF37 Fuses and HEADLAMP LOW, HEADLAMP HIGH Relays
Figure 13:

Fuse Block - I/P F5, F6, F7, F14 Fuses


Object Number: 2003467  Size: FS
Master Electrical Component List
Control Module References
Fuse Block-I/P F19 Fuse
Fuse Block - I/P F4, F13, F21 Fuses
Figure 14:

Fuse Block - I/P F19 Fuse


Object Number: 2003469  Size: FS
Master Electrical Component List
Control Module References
Fuse Block - I/P F5, F6, F7, F14 Fuses