A/C Signal Circuit Troubleshooting
- Start the engine, and let it idle
- Turn the blower switch on
- Turn the A/C switch on
- Check the A/C CLUTCH in the DATA LIST with the HDS
Does it indicate ON?
YES -Go to step 5
NO -Do the A/C system test (see A/C SYSTEM INSPECTION )
- Check the A/C system
Does the A/C system operate?
YES -The air conditioning system circuit is OK
NO -Go to step 6
- Turn the ignition switch to LOCK (0)
- Turn the ignition switch to ON (II)
- Activate the A/C CLUTCH in the INSPECTION MENU with the HDS
Is there a clicking noise from the A/C compressor clutch?
YES -Do the A/C system test (see A/C SYSTEM INSPECTION )
NO -Go to step 9
- Turn the ignition switch to LOCK (0)
- Jump the SCS line with the HDS
- Disconnect ECM/PCM connector A (49P)
- Turn the ignition switch to ON (II)
- Momentarily connect ECM/PCM connector terminal A15 to body ground with a jumper wire several times
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there a clicking noise from the A/C compressor clutch?
YES -Reconnect all connectors, then update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM (see ECM/PCM REPLACEMENT )
NO -Check for poor connections or loose terminals at the A/C compressor clutch relay and the ECM/PCM If the connections are OK, check the A/C compressor clutch relay (see POWER RELAY TEST ) Then repair open in the wire between the ECM/PCM (A15) and the A/C compressor clutch relay and the other A/C systems