Test C: The Air Conditioning (A/C) Is Inoperative/Does Not Operate Correctly

PINPOINT TEST C: THE AIR CONDITIONING (A/C) IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

C1-C4:

C4-C6:

C7-C9:

C9-C11:

C12-C13:

C14-C15:

Normal Operation
Under normal operation, the function selector switch is supplied voltage through circuit 1003 (GY/YE). When any mode requiring A/C is selected, the function selector switch sends voltage to the powertrain control module (PCM) through circuit 348 (VT). Ground is provided to the A/C high pressure switch through circuit 570 (BK/WH). Ground is supplied from the A/C high pressure switch to the A/C cycling switch through circuit 441 (RD/YE). The ground is then supplied from the A/C cycling switch to the PCM through circuit 347 (BK/YE).

Voltage is supplied to the A/C clutch relay switch through circuit 883 (PK/LB). When the relay is energized, voltage is sent to the A/C clutch through circuit 321 (GY/WH). The A/C clutch is grounded through circuit 57 (BK).

Possible Causes
- Fuse(s)
- An open in circuits 57 (BK), 321 (GY/WH), 347 (BK/YE), 348 (VT), 441 (RD/YE), 570 (BK/WH), 883 (PK/LB) or 1003 (GY/YE)
- PCM
- Function selector switch
- A/C cycling switch
- A/C compressor clutch field coil
- A/C control relay
- A/C clutch air gap