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

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

K1-K5:

K5-K6:

K7-K8:

K9-K11:

Normal Operation
Under normal operation, when A/C is requested, a message is sent over the MSCAN bus to the PCM. Ignition voltage is provided to the A/C clutch relay switch. When the powertrain control module (PCM) energizes the relay, ignition voltage is supplied to the A/C clutch through circuit CH401 (VT/WH). Ground is supplied for the A/C clutch through circuit GD138 (BK/WH).

Possible Causes
- Fuse
- An open in circuits CH401 (VT/WH) or GD138 (BK/WH)
- PCM
- EATC module
- EMTC module
- A/C evaporator discharge temperature sensor
- A/C pressure transducer
- A/C compressor clutch field coil
- A/C control relay
- A/C clutch air gap
- Battery junction box (BJB