Test J: The A/C Does Not Operate/Does Not Operate Correctly

PINPOINT TEST J: THE A/C DOES NOT OPERATE/DOES NOT OPERATE CORRECTLY

J1-J5:

J6-J8:

J8-J10:

J10-J12:

J12-J14:

J14-J16:

J17-J19:

Normal Operation
Under normal operation, in EATC systems, when A/C is requested, a message is sent over the bus to the PCM. Voltage is provided to the A/C cycling switch through circuit 298 (VT/OG)/348 (VT). Voltage is sent from the A/C cycling switch to the dual-function pressure switch through circuit 441 (RD/YE). Voltage is sent from the dual-function pressure switch to the PCM through circuit 879 (DG/WH).

Under normal operation, in manual climate control systems, voltage is provided to the function selector switch through circuit 1087 (OG). When A/C is requested, a voltage is sent from the function selector switch to the A/C cycling switch through circuit 348 (VT). Voltage is sent from the A/C cycling switch to the dual-function pressure switch through circuit 441 (RD/YE). Voltage is sent from the dual-function pressure switch to the PCM through circuit 879 (DG/WH).

The PCM provides a ground for the A/C clutch relay coil through circuit 331 (PK/YE). The A/C clutch relay coil receives ignition voltage through circuit 361 (RD). Ignition voltage for the A/C clutch relay switch is provided through circuit 883 (PK/LB). When the relay is energized, ignition voltage is supplied to the A/C clutch solenoid through circuit 347 (BK/YE). Ground is supplied for the A/C clutch through circuit 57 (BK).

Possible Causes
- An open in circuits 57 (BK), 298 (VT/OG), 331 (PK/YE), 347 (BK/YE), 348 (VT), 441 (RD/YE), 879 (DG/WH), 883 (PK/LB) or 1087 (OG)
- PCM
- Remote climate control (RCC) module
- Function selector switch
- A/C cycling switch
- Dual-function pressure switch
- A/C compressor clutch field coil
- A/C control relay
- A/C clutch air gap