Pinpoint Test 20: The Air Conditioning (A/C) Is Always On - A/C Mode Always Commanded On

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PINPOINT TEST 20: THE AIR CONDITIONING (A/C) IS ALWAYS ON - A/C MODE ALWAYS COMMANDED ON - HYBRID

Normal Operation

Voltage is supplied to the A/C low charge protection switch through circuit (W/V). When the A/C low charge protection 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 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
- Wiring, terminals or connectors
- PCM
- HVAC module
- A/C low charge protection switch

Diagnostic Procedure


NOTE: Before carrying out the following test, diagnose any PCM or instrument cluster (IC) 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.

Step 1-Step 3:

Step 4-Step 6: