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A/C Signal Circuit Troubleshooting

  1. Start the engine and let it idle.
  2. Turn the blower switch on.
  3. Turn the A/C switch on.
  4. Check the A/C CLUTCH in the DATA LIST with the HDS.

    Is it ON? 

    1. YES  - Go to step 5.
    2. NO  - Go to the A/C SYSTEM TEST .
  5. Check the A/C system.

    Does the A/C system operate? 

    1. YES  - The air conditioning system circuit is OK.
    2. NO  - Go to step 6.
  6. Turn the ignition switch OFF.
  7. Turn the ignition switch ON (II).
  8. Activate the A/C CLUTCH in the INSPECTION MENU with the HDS.

    Is there a clicking noise from the A/C compressor clutch? 

    1. YES  - Do the A/C system test (see A/C SYSTEM TEST ).
    2. NO  - Go to step 9.
  9. Momentarily connect under-hood fuse/relay box 16P connector terminal No. 15 to body ground with a jumper wire several times.
    Fig 1: Connecting Under-Hood Fuse/Relay Box 16P Connector Terminal No. 15 To Body Ground With A Jumper Wire Several Times
    G03663797Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there clicking noise from the A/C compressor clutch? 

    1. YES  - Repair open in the wire between the PCM (E27) and the A/C compressor clutch relay.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see UPDATING THE PCM ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ).
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