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Air Conditioning Signal: MDX

WARNING: This page is about a different car, the 2004 Acura 3.5RL, 2003 Acura 3.5RL, 2003 Acura 3.2TL, and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine. Turn blower on. Turn A/C on. With the Honda PGM Tester or the HDS, check A/C CLUTCH in the DATA list. If it is on, go to next step. If it is not on, see appropriate HVAC SYSTEMS-A/C PRESSURE SWITCH TEST article in AIR CONDITIONING & HEATING.
  2. Check the A/C system. If it is operating properly, the A/C system circuit is OK. If it is not operating properly, go to next step.
  3. Turn ignition off. Turn ignition on. With the Honda PGM Tester or the HDS, activate A/C CLUTCH in the INSPECTION menu. If a clicking noise is heard, go to appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. If a clicking noise is not heard, go to next step.
  4. Turn ignition off. Disconnect PCM harness connector B. See Figure . Turn ignition on. With a fused jumper wire, momentarily connect PCM harness connector terminal B11 to ground several times. If a clicking noise is heard, update the PCM if it does not have the latest software. Substitute known-good PCM then recheck. If symptom or indication goes away, replace original PCM. If a clicking noise is not heard, check for poor connections or loose terminals at A/C clutch relay and PCM. If they are OK, check the A/C clutch relay and go to appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
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