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

Engine/Center of Front Dash Wiring


Object Number: 786790  Size: LF
(1)Cruise Control Module (CCM)
(2)Intake Air Temperature (IAT) Sensor Connector
(3)Windshield Wiper Motor and Module
(4)Intake Air Temperature (IAT) Sensor
(5)A/C Low Pressure Switch
(6)A/C Low Pressure Switch Connector
(7)Coolant Bypass Valve Solenoid
(8)Coolant Bypass Valve Solenoid Connector
(9)Mass Air Flow (MAF)Sensor
(10)Mass Air Flow (MAF) Sensor Connector
(11)Mass Air Flow (MAF) Sensor Connector
(12)Mass Air Flow (MAF) Sensor
(13)Intake Air Temperature (IAT) Sensor
(14)Intake Air Temperature (IAT) Sensor Connector
(15)Blower Motor
(16)S116
Figure 2:

IP Wiring, Right Side


Object Number: 786804  Size: LF
(1)S241
(2)S229
(3)S223
(4)S224
(5)S259
(6)S227
(7)S228
(8)Air Temperature Actuator Connector
(9)Air Temperature Actuator
Figure 3:

HVAC Panel Wiring


Object Number: 281316  Size: SF
(1)Temperature Switch (Part of HVAC Control Assembly)
(2)Mode Switch (Part of HVAC Control Assembly)
(3)HVAC Control Assembly
(4)Blower Motor Switch - Heater Auxiliary Connector
(5)Blower Motor Switch - Heater Auxiliary
(6)Blower Motor Switch - A/C Auxiliary
(7)Blower Motor Switch - A/C Auxiliary Connector
(8)Rear Window Wiper/Washer Switch
(9)Radio
(10)Instrument Panel Cluster (IPC)
(11)Rear Defogger Switch (Part of HVAC Control Assembly)
(12)Blower Switch (Part of HVAC Control Assembly)
Figure 4:

Rear Heater Wiring


Object Number: 374527  Size: LF
(1)G301
(2)Blower Motor Resistor - Heater Auxiliary Connector
(3)Blower Motor - Heater Auxiliary Ground Connector (C1)
(4)Blower Motor - Heater Auxiliary Power Connector (C2)
(5)Blower Motor - Heater Auxiliary
(6)Blower Motor Resistor - Heater Auxiliary
Figure 5:

A/C Wiring Rear


Object Number: 374534  Size: LF
(1)Blower Motor Resistor - A/C Auxiliary Connector
(2)Blower Motor Resistor - A/C Auxiliary
(3)G404
(4)Blower Motor - A/C Auxiliary
(5)Blower Motor - A/C Auxiliary Connector C1
(6)Blower Motor - A/C Auxiliary Connector C2