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Home >> Infiniti >> 1999 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Miscellaneous Controls >> A/C Clutch Relay
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A/C Clutch Relay

  1. A/C clutch relay is controlled by PCM. Under normal conditions, PCM will engage clutch relay by providing a ground circuit for relay windings. If PCM 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, PCM will disengage relay.
  2. Remove A/C relay. On G20 and I30, 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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