PINPOINT TEST N : The Air Conditioning (A/C) Is Always On - A/C Compressor Does Not Cycle: Notes

Refer to AUTOMATIC CLIMATE CONTROL SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions 

When the A/C is requested, the FCIM sends the button press message over the I-CAN to the IPC. The IPC then sends the button press message to BCM over the HS-CAN. The BCM then sends the button press message to the HVAC module over the MS-CAN. Lastly the HVAC module sends an A/C request message through the MS-CAN to the BCM and the BCM sends the A/C request through the HS-CAN to the PCM.

Refer to CLIMATE CONTROL - DATC , Control System Logic

Refer to CLIMATE CONTROL - DATC , Controls and Compressor Cycling

Visual Inspection and Diagnostic Pre-checks 

• Inspect loose or corroded PCM and A/C clutch relay connections.