A/C Signal Circuit Troubleshooting
- Start the engine.
- Turn the blower switch on.
- Turn the A/C switch on.
- Check the A/C CLUTCH in the DATA LIST with the HDS.
Is it ON?
YES -Go to step 5.
NO -Go to the A/C pressure switch circuit troubleshooting (see A/C PRESSURE SWITCH AND THERMAL PROTECTER CIRCUIT TROUBLESHOOTING ).
- 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.
- 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 Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there a clicking noise from the A/C compressor clutch?
YES -Repair open in the wire between the ECM/PCM (E18) and the A/C clutch relay.
NO -Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), 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; '04-05 models (see '04-05 MODELS ), '06-08 models (see '06-08 MODELS ).