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

Power, Ground, Serial Data, DIC, and Indicators


Object Number: 1785073  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - 5-Volt Reference Bus
Underhood Fuse Block Cooling Fan Fuses/Relays, Main Relay, ECM, and TOS
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
G104 1 of 2
Underhood Fuse Block DIM/ALDL, Volt Check, Flasher, CCP, ECM/TCM, and ABS Fuses
Ignition Switch 2 of 2
Ignition Switch 1 of 2
Class 2 Serial Data Bus - LHD (1 of 2)
Class 2 Serial Data Bus - LHD (2 of 2)
Underhood Fuse Block DIM/ALDL, Volt Check, Flasher, CCP, ECM/TCM, and ABS Fuses
G130, G131, G132 and G133 (LP1/LY7)
Power, Ground, GMLAN BUS
Engine Controls Schematic Icons
G104 1 of 2
Figure 2:

Engine Data Sensors - 5-Volt Reference Bus


Object Number: 1785081  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - Low Reference Bus
Engine Controls - 2.8L/3.6L (LP1/LS2) (Power, Ground, Serial, DIC and Indicator)
Figure 3:

Engine Data Sensors - Low Reference Bus


Object Number: 1785086  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - BARO, ECT, MAF, and IAT Sensors
Engine Data Sensors - 5-Volt Reference Bus
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
G130, G131, G132 and G133 (LP1/LY7)
Figure 4:

Engine Data Sensors - BARO, ECT, MAF, and IAT Sensors


Object Number: 1785738  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - Heated Oxygen Sensors (HO2S)
Engine Data Sensors - Low Reference Bus
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
G104 1 of 2
Underhood Fuse Block B+ BUS 2 of 2
Engine Data Sensors - Low Reference Bus
Engine Data Sensors - Low Reference Bus
G104 1 of 2
Figure 5:

Engine Data Sensors - Heated Oxygen Sensors (HO2S)


Object Number: 1785756  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Engine Data Sensors - Throttle Actuator Control (TAC) System
Engine Data Sensors - BARO, ECT, MAF, and IAT Sensors
Underhood Fuse Block Pre O2/CAM Fuse
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block Pre O2/CAM Fuse
Engine Controls Schematic Icons
Engine Controls Schematic Icons
Engine Controls Schematic Icons
Engine Controls Schematic Icons
Figure 6:

Engine Data Sensors - Throttle Actuator Control (TAC) System


Object Number: 1786186  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Ignition Controls - Bank 1 IGN Coils
Engine Data Sensors - Heated Oxygen Sensors (HO2S)
Engine Controls Schematic Icons
Figure 7:

Ignition Controls - Bank 1 IGN Coils


Object Number: 1786663  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Ignition Controls - Bank 2 IGN Coils
Engine Data Sensors - Throttle Actuator Control (TAC) System
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block Odd INJ/Coil Fuse
Underhood Fuse Block Odd INJ/Coil Fuse
G130, G131, G132 and G133 (LP1/LY7)
Figure 8:

Ignition Controls - Bank 2 IGN Coils


Object Number: 1786669  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Ignition Controls - Sensors and CMP Actuator Solenoids
Ignition Controls - Bank 1 IGN Coils
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block Even INJ/Coil Fuse
Underhood Fuse Block Even INJ/Coil Fuse
Underhood Fuse Block Even INJ/Coil Fuse
Figure 9:

Ignition Controls - Sensors and CMP Actuator Solenoids


Object Number: 1786692  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Ignition Controls - Crankshaft and Position Sensor and Knock Sensors
Ignition Controls - Bank 2 IGN Coils
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block Pre O2/CAM Fuse
Underhood Fuse Block Pre O2/CAM Fuse
Engine Data Sensors - Low Reference Bus
Figure 10:

Ignition Controls - Crankshaft Position Sensor (CKP) and Knock Sensors (KS)


Object Number: 1786706  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuel Controls and Fuel Injectors, Fuel Pump and Sender Assembly
Ignition Controls - Sensors and CMP Actuator Solenoids
Engine Controls Schematic Icons
Engine Controls Schematic Icons
Figure 11:

Fuel Controls - Fuel Injectors, Fuel Pump and Sender Assembly


Object Number: 1786759  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuel Controls - EVAP Controls and IMRC Solenoid
Ignition Controls - Crankshaft and Position Sensor and Knock Sensors
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
Right Rear Fuse Block B+ Bus
Underhood Fuse Block Odd INJ/Coil Fuse
G401
Gages 2.8L/3.6L (LP1/LY7)
Figure 12:

Fuel Controls - EVAP Controls and IMRC Solenoid


Object Number: 1786767  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Controlled/Monitored Subsystem References
Fuel Controls and Fuel Injectors, Fuel Pump and Sender Assembly
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
Underhood Fuse Block B+ BUS 2 of 2
Right Rear Fuse Block, DR MOD PWR Circuit Breaker Canister Vent, RIM/IGN SW., FRT HTD Seat MOD, and PWR Sander Fuses
Underhood Fuse Block Pre O2/CAM Fuse
Engine Data Sensors - Low Reference Bus
Engine Data Sensors - Low Reference Bus
Figure 13:

Controlled/Monitored Subsystem References


Object Number: 1786790  Size: FS
Master Electrical Component List
Engine Control Module Description
Control Module References
Fuel Controls - EVAP Controls and IMRC Solenoid
Starting System - 2.8L/3.6L (LP1/LY7)
07 CTS Antilock Brake System - Power, Ground, Serial Data and DIC
Cooling Fans - 2.8L/3.6L (LP1/LY7)
Cruise Control System - 2.8L/3.6L (LP1/LY7)
Engine Oil Pressure (EOP) Sensor, Engine Oil Level/Temp. Sensor, TFT and Indicator
A/C Compressor Controls 2.8L/3.6L (LP1/LY7)
BPP Sensor, Switches and Indicators - 2.8L/3.6L (LP1/LY7)
Power, Ground, Serial Data, TCM and Internal Mode Switch (IMS)