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Test I: The Air Conditioning (A/C) Is Inoperative/Does Not Operate Correctly
PINPOINT TEST I: THE AIR CONDITIONING (A/C) IS INOPERATIVE/DOES NOT OPERATE CORRECTLYNormal Operation
Under normal operation, when A/C is requested, a message is sent over the UART-based protocol (UBP) bus to the instrument cluster, then from the instrument cluster through the controller area network (CAN) bus to the PCM (HVAC module - electronic automatic temperature control [EATC] systems) or sends voltage to the instrument cluster through circuit 348 (VT) then a message from the instrument cluster through the CAN bus to the PCM (HVAC module - electronic manual temperature control [EMTC] systems). Voltage is provided to the A/C cycling switch through circuit 295 (LB/PK). The PCM receives input from the A/C cycling switch through circuit 347 (BK/YE).
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 391 (RD/YE). Ignition voltage for the A/C clutch relay switch is provided through circuit 883 (PK/LB). When the relay is activated, ignition voltage is supplied to the A/C clutch solenoid through circuit 321 (GY/WH). Ground is supplied for the A/C clutch through circuit 57 (BK).
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- PCM
- HVAC module - EATC
- HVAC module - EMTC
- A/C cycling switch
- A/C compressor clutch field coil
- A/C control relay
- A/C clutch air gap
I1:
I2-I5:
I6-I11:
I11-I13:
I13-I15:
I15-I17:
I17-I18:
I18-I20:
I20-I21:
I21-I22:
