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

Cell 21: Power and Grounding


Object Number: 372027  Size: FS
Engine Controls Components
Vehicle Control Module Description
Cell 21: Ignition System
OBD II Symbol Description Notice
Cell 11: Gauges fuse
Handling ESD Sensitive Parts Notice
Cell 11: ECM-I fuse [L35]
Cell 81: Gauges [L57]
Cell 21: A/T Controls - Solenoids and TCC Stoplamp Switch
Cell 10: Ignition Switch and Fuse Block
Cell 10: Fuse Block and Headlamp Switch
Cell 21: Fuel Controls - Pump Control
Cell 21: A/C Controls
Handling ESD Sensitive Parts Notice
Cell 44: Gas, ABS Power and Grounding, DLC Output
Cell 50
Cell 14: G200
Cell 14: S110 [L31/L35]
Cell 14: G108 [L31/L35]
Figure 2:

Cell 21: Ignition System


Object Number: 372030  Size: FS
Engine Controls Components
Enhanced Ignition System Description
Cell 21: Fuel Controls - Pump Control
Cell 21: Power and Grounding
OBD II Symbol Description Notice
Cell 11: Engine Control Sensors
Cell 10: Ignition Switch and Fuse Block
Cell 81: Gauges [L57]
Cell 11: ECM-I fuse [L35]
Cell 81: Gauges [L57]
Handling ESD Sensitive Parts Notice
Cell 14: G104 [L31/L35]
Handling ESD Sensitive Parts Notice
Figure 3:

Cell 21: Fuel Controls -- Pump Control


Object Number: 372033  Size: FS
Engine Controls Components
Central Sequential Duel Injection Fuel System Description
Cell 21: Fuel Controls - Injectors
Cell 21: Ignition System
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Cell 21: Power and Grounding
Cell 10: Fuse Block and Headlamp Switch
Handling ESD Sensitive Parts Notice
Cell 14: G104 [L31/L35]
Cell 14: G105, G106, G110, G400, and G401
Handling ESD Sensitive Parts Notice
Cell 21: Engine Data Sensors - MAP, IAT, TP ECT
Cell 21: EVAP and EGR Controls
Figure 4:

Cell 21: Fuel Controls -- Injectors


Object Number: 372037  Size: FS
Engine Controls Components
Central Sequential Duel Injection Fuel System Description
Cell 21: Engine Data Sensors - MAP, IAT, TP ECT
Cell 21: Fuel Controls - Pump Control
OBD II Symbol Description Notice
Cell 11: ECM-I fuse [L35]
Cell 10: Ignition Switch and Fuse Block
Handling ESD Sensitive Parts Notice
Figure 5:

Cell 21: Engine Data Sensors -- MAP, IAT, TP ECT


Object Number: 372040  Size: FS
Engine Controls Components
Information Sensors/Switches Description
Cell 21: Engine Data Sensors - HO2S
Cell 21: Fuel Controls - Injectors
OBD II Symbol Description Notice
Engine Controls Components
Cell 21: EVAP and EGR Controls
Cell 21: EVAP and EGR Controls
Handling ESD Sensitive Parts Notice
Cell 21: A/T Controls - Internal Switches and TISS
Cell 21: EVAP and EGR Controls
Figure 6:

Cell 21: Engine Data Sensors -- HO2S


Object Number: 372043  Size: FS
Engine Controls Components
Information Sensors/Switches Description
Cell 21: Engine Data Sensors - MAF, IAC, VSS
Cell 21: Engine Data Sensors - MAP, IAT, TP ECT
OBD II Symbol Description Notice
Cell 11: Engine Control Sensors
Cell 10: Ignition Switch and Fuse Block
Cell 11: Engine Control Sensors
Handling ESD Sensitive Parts Notice
Starting System
Figure 7:

Cell 21: Engine Data Sensors -- MAF, IAC, VSS


Object Number: 372046  Size: FS
Engine Controls Components
Information Sensors/Switches Description
Cell 21: EVAP and EGR Controls
Cell 21: Engine Data Sensors - HO2S
OBD II Symbol Description Notice
Cell 10: Ignition Switch and Fuse Block
Cell 11: Engine Control Sensors
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Cell 14: G104 [L31/L35]
Handling ESD Sensitive Parts Notice
Cell 14: G104 [L31/L35]
Figure 8:

Cell 21: EVAP and EGR Controls


Object Number: 372048  Size: FS
Engine Controls Components
Evaporative Emission Control System Operation Description Enhanced
Cell 21: Stoplamp and Clutch Pedal Position Switch Inputs
Cell 21: Engine Data Sensors - MAF, IAC, VSS
OBD II Symbol Description Notice
Cell 11: Engine Control Sensors
Cell 10: Ignition Switch and Fuse Block
Cell 21: Fuel Controls - Pump Control
Handling ESD Sensitive Parts Notice
Cell 21: Engine Data Sensors - MAP, IAT, TP ECT
Cell 21: Engine Data Sensors - MAP, IAT, TP ECT
Figure 9:

Cell 21: Stoplamp and Clutch Pedal Position Switch Inputs


Object Number: 387826  Size: FS
Engine Controls Components
Cell 21: A/T Controls - Solenoids and TCC Stoplamp Switch
Cell 21: EVAP and EGR Controls
OBD II Symbol Description Notice
Cell 10: Ignition Switch and Fuse Block
Cell 21: Power and Grounding
Cell 44: Gas, ABS Power and Grounding, DLC Output
Handling ESD Sensitive Parts Notice
Figure 10:

Cell 21: A/T Controls -- Solenoids and TCC Stoplamp Switch


Object Number: 372051  Size: FS
Engine Controls Components
Electronic Component Description
Cell 21: A/T Controls - Internal Switches and TISS
Cell 21: Stoplamp and Clutch Pedal Position Switch Inputs
OBD II Symbol Description Notice
Cell 10: Ignition Switch and Fuse Block
Cell 21: Power and Grounding
Cell 10: Ignition Switch and Fuse Block
Handling ESD Sensitive Parts Notice
Cell 138: P42 BTSI Circuit
Cell 44: Gas, ABS Power and Grounding, DLC Output
Figure 11:

Cell 21: A/T Controls -- Internal Switches and TISS


Object Number: 372056  Size: FS
Engine Controls Components
Electronic Component Description
Cell 21: A/C Controls
Cell 21: A/T Controls - Solenoids and TCC Stoplamp Switch
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Cell 21: Engine Data Sensors - MAP, IAT, TP ECT
Figure 12:

Cell 21: A/C Controls


Object Number: 372058  Size: FS
Engine Controls Components
Relays and Sensors Description
Cell 21: A/T Controls - Internal Switches and TISS
OBD II Symbol Description Notice
Cell 10: Fuse Block and Headlamp Switch
Cell 10: Ignition Switch and Fuse Block
Cell 11: Gauges fuse
Cell 14: G104 [L31/L35]
Handling ESD Sensitive Parts Notice
Cell 14: G200
Cell 14: S110 [L31/L35]