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

C212 (Upfitter Connector) Terminals B, N, P, T and X, Junction Block -- Upfitter I/P


Object Number: 725664  Size: FS
Master Electrical Component List
Upfitter Provision Schematics - C212 Upfitter Connector Terminals A, F, L and Z
Power Distribution Schematics - ABS, Body Power 2, ING SW 2, Lighting, PCM/Injectors and Starter Fuses, Even and ODD INJ, HAZ, PNL, and TL/MKR Circuit Breakers
Power Distribution Schematics - Aux 1, Aux 2, ECM, ENG, ETM and Fuel Circuit Breakers, Aux, Body Power 1 and Engine Fuses
Battery and BRK, HORNS, and STOP LP Circuit Breakers, HD LP SW, HORN/STOP and IGN SW 1 Fuses
Battery and BRK, HORNS, and STOP LP Circuit Breakers, HD LP SW, HORN/STOP and IGN SW 1 Fuses
Battery and BRK, HORNS, and STOP LP Circuit Breakers, HD LP SW, HORN/STOP and IGN SW 1 Fuses
Automatic Transmission Controls Schematics - Multifunction Alarm Module, Park/Neutral Position (PNP) Switch, Stoplamp Switch (MX4/MTW)
Figure 2:

C212 (Upfitter Connector) Terminals A, F, L and Z


Object Number: 725665  Size: FS
Master Electrical Component List
Upfitter Provision Schematics - C212 Upfitter Connector Terminals D, G, K, R and V
Upfitter Provision Schematics - C212 Upfitter Connector Terminals B, N, P, T and X, Junction Block - Upfitter I/P
Upfitter Provision Schematics - C212 Upfitter Connector Terminals E and M
Ground Distribution Schematics - S220, S229 LG5
Ground Distribution Schematics - S220, S229 LG5
Exterior Lights Schematics - Park Lamps
Upfitter Provision Schematics - C212 Upfitter Connector Terminals E and M
Interior Lights Schematics
Figure 3:

C212 (Upfitter Connector) Terminals D, G, K, R and V


Object Number: 725671  Size: FS
Master Electrical Component List
Upfitter Provision Schematics - C212 Upfitter Connector Terminals E and M
Upfitter Provision Schematics - C212 Upfitter Connector Terminals A, F, L and Z
Starting and Charging Schematics - L18 Starting Circuit
Power Distribution Schematics - ACC, B/U, Chassis, ING 1, ING 3 and Start Circuit Breakers
Power Distribution Schematics - IGN 3 Circuit Breaker
Figure 4:

C212 (Upfitter Connector) Terminals E and M


Object Number: 725673  Size: FS
Master Electrical Component List
Upfitter Provision Schematics - C212 Upfitter Connector Terminals D, G, K, R and V
Power Distribution Schematics - IGN 1 Circuit Breaker, S225, S226, S230
Power Distribution Schematics - IGN 1 Circuit Breaker, S232, S243
Instrument Cluster Schematics - DIC, ABS, CHG OIL, DRL, EOS and HI Ind.
Ground Distribution Schematics - G101, S138, S405 and S409 L18
Ground Distribution Schematics - G102, and S138 L18
Ground Distribution Schematics - G102, and S138 L18
Ground Distribution Schematics - S142, S178, S179, S405 and S409 L18
Ground Distribution Schematics - G108, G207, G208 and S221 LG5
Ground Distribution Schematics - G207, G208, and S221 L18
Upfitter Provision Schematics - C212 Upfitter Connector Terminals A, F, L and Z
Upfitter Provision Schematics - C212 Upfitter Connector Terminals A, F, L and Z