GM Service Manual Online
For 1990-2009 cars only

Refer to

A/C Controls


Object Number: 185307  Size: FS
Cell 10: ECM-B, HORN and A/C COMP Fuses
Cell 10: IGN A Fuse and Ignition Switch
Cell 10: BRAKE and HTR-A/C Fuses
Cell 10: IGN B Fuse and Ignition Switch
Cell 14: G105 (1 of 2)
Cell 14: G105 (1 of 2)
Cell 14: G105 (1 of 2)
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice
Cell 14: G200 (4 of 4)
Handling ESD Sensitive Parts Notice
OBD II Symbol Description Notice
4WD and Cruise Controls
.

Circuit Description

Turning ON the air conditioning supplies ignition voltage to the A/C compressor clutch and to the PCM to increase and maintain idle speed.

The PCM does not control the A/C compressor clutch. Therefore, if the A/C system does not function, refer to A/C Systems of the appropriate service manual for diagnosis of the system.