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-C3:

C3 Continued:

C3-C4:

C4 Continued:

C4-C6:

C6-C8:

C8-C10:

C11-C13:

C13-C14:

Normal Operation
Under normal operation, the function selector switch is supplied voltage through circuit CBP27 (GN/BN). When any mode requiring A/C is selected, the function selector switch sends voltage to the A/C high pressure switch through circuit CH443 (GN/OG). Voltage is then supplied from the A/C high pressure switch to the A/C cycling switch through circuit CH423 (YE). The voltage is then supplied from the A/C cycling switch to the PCM through circuit CH425 (GN/BU).

Voltage is supplied to the A/C clutch relay switch through circuit SBB25 (RD). When the relay is energized, voltage is sent to the A/C clutch through circuit CH401 (VT/WH). The A/C clutch is grounded through circuit GD121 (BK/YE).

Possible Causes
- Fuse(s)
- An open in circuits GD121 (BK/YE), CH401 (VT/WH), CH425 (GN/BU), CH443 (GN/OG), CH423 (YE), SBB25 (RD) or CBP27 (GN/BN)
- PCM
- Function selector switch
- A/C cycling switch
- A/C high pressure switch
- A/C compressor clutch field coil
- A/C control relay
- A/C clutch air gap