A/C Compressor Clutch Circuit

WHEN MONITORED
Engine Running with the A/C on.

SET CONDITION
The A/C Heater Control Module detects an A/C Compressor malfunction.

POSSIBLE CAUSES
- A/C compressor clutch signal circuit open
- A/C compressor clutch
- A/C heater control module

Diagnostic Test




1. TEST THE A/C COMPRESSOR CLUTCH

Turn the ignition off.
Disconnect the inline connector C106 in the underhood relay control module compartment.

NOTE: Check connector - Clean/repair as necessary.

Using a jumper wire to battery power, energize the A/C Compressor clutch.

Q: Does the A/C Compressor clutch energize?

YES: Go to 2
NO: Go to 3




2. MEASURE THE RESISTANCE OF THE A/C COMPRESSOR CLUTCH SIGNAL CIRCUIT

With the ignition off. Disconnect the A/C Heater Control Module harness connector.

NOTE: Check connector - Clean/repair as necessary. Measure the resistance of the A/C Compressor Clutch signal circuit from the inline connector C106 to the A/C Heater Control Module harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the A/C Heater Control Module. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the A/C Compressor Clutch signal circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test




3. MEASURE THE RESISTANCE OF THE A/C COMPRESSOR CLUTCH SIGNAL CIRCUIT

With the ignition off. Disconnect the A/C Compressor Clutch connector.

NOTE: Check connector - Clean/repair as necessary.

Measure the resistance of the A/C Compressor Clutch signal circuit from the inline connector C106 to the A/C Compressor Clutch connector.

Q: Is the resistance below 5.0 ohms?

YES Replace the A/C Compressor Clutch. Perform BODY VERIFICATION TEST. Body Verification Test
NO Repair the A/C Compressor Clutch signal circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test