Test J: The Air Conditioning (A/C) Is Always On

PINPOINT TEST J: THE AIR CONDITIONING (A/C) IS ALWAYS ON

Normal Operation
Under normal operation, when A/C is requested, a message is sent over the medium speed controller area network (MS-CAN) bus to the PCM. Ignition voltage is provided to the A/C clutch relay switch. When the 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 GD124 (BK/VT).

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PCM
- Electronic automatic temperature control (EATC) module
- Electronic manual temperature control (EMTC) module
- A/C cycling switch
- A/C control relay
- A/C clutch air gap

J1-J4:

J4-J7:

J7-J9: