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 TEST ).
- 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 OFF.
- Turn the ignition switch 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 TEST ).
NO -Go to step 9.
- Turn the ignition switch OFF.
- Jump the SCS line with the HDS.
- Disconnect ECM connector A (44P).
- Turn the ignition switch ON (II).
- Momentarily connect ECM connector terminal A14 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 -Update the ECM if it does not have the latest software (see ECM UPDATE ), or substitute a known-good ECM (see SUBSTITUTING THE ECM ), then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM (see ECM REPLACEMENT ).
NO -Check for poor connections or loose terminals at the A/C compressor clutch relay and the ECM. 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 (A14) and the A/C compressor clutch relay and the other A/C systems.