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DTC P0645: A/C Clutch Relay Circuit: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, actuate the A/C Clutch Relay. Is the A/C Clutch Relay clicking? Relay is located in Power Distribution Center (PDC). If yes, go to INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn ignition off. Remove the A/C Clutch Relay from the PDC. Measure the resistance between terminals No. 1 (85) and 2 (86) at the A/C Clutch Relay (component side). Is the resistance between 50.0 and 90.0 ohms? If yes, go to next step. If no, replace the A/C Clutch Relay.
  3. Turn ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (F12) Fused Ignition Switch Output circuit in the A/C Clutch Relay connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the open or short to ground in the (F12) Fused Ignition Switch Output circuit. Check the related fuse.
  4. Measure the resistance of the (C13) A/C Clutch Relay Control circuit between the PDC terminal and the PCM harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair open in the (C13) A/C Clutch Relay Control circuit.
  5. Measure the resistance between ground and the (C13) A/C Clutch Relay Control circuit at the PCM connector. Is the resistance below 100 ohms? If yes, repair the A/C Clutch Relay Control circuit for a short to ground. If no, go to next step.
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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