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A/C Clutch Relay

  1. A/C clutch relay is controlled by ECM. Under normal conditions, ECM will engage clutch relay by providing a ground circuit for relay windings. If ECM receives a wide open throttle signal from throttle position sensor while it is also receiving an A/C on signal from A/C auto amplifier, ECM will disengage relay.
  2. Remove A/C relay. On G20, A/C clutch relay is located in relay box on right side of engine compartment. On Q45, relay is located on right inner fender panel, rear of strut tower.
  3. Apply battery voltage to terminals No. 1 and 2. See Figure. Continuity should exist between terminals No. 3 and 5. When battery voltage is removed, continuity should not exist. Replace relay if continuity is not as specified.
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