Pinpoint Test 9: The Air Conditioning (A/C) Is Inoperative/Does Not Operate Correctly
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PINPOINT TEST 9: THE AIR CONDITIONING (A/C) IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - HYBRID
Normal Operation
Voltage is supplied to the A/C cycling switch through circuit (G/BR). When the A/C cycling switch is closed (ON), voltage is sent to the dual-function pressure switch through circuit (V). When the dual-function pressure switch is closed (ON), voltage is provided to the PCM. Ignition voltage is provided to the A/C clutch relay switch through circuit (GY/R). When A/C is requested, a message is sent over the MS-CAN bus to the PCM. When the PCM energizes the relay, ignition voltage is supplied to the A/C clutch through circuit (V/W). Ground is supplied for the A/C clutch through circuit (B/G).
Possible Causes
- Fuse(s)
- Wiring, terminals or connectors
- PCM
- Dual automatic temperature control (DATC) module
- A/C clutch cycling pressure switch
- Dual pressure switch
- A/C clutch solenoid
- A/C clutch relay
- A/C clutch air gap
- Battery junction box (BJB)
Diagnostic Procedure
NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first.
NOTE: Before carrying out the following test, diagnose any instrument cluster DTCs.
NOTE: When disconnecting and reconnecting the pressure transducer electrical connector, make sure that the connector-locking device is in place and that the locking device and connector are correctly and fully seated.
NOTE: Before carrying out the following test, check that the A/C system pressure is above 290 kPa (42 psi). If the pressure is below 290 kPa (42 psi), see Tracer Dye Leak Detection.
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Step 5-Step 9:
