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.
Does it indicate ON?
YES - Go to step 5.
NO - Go to the A/C pressure switch test circuit troubleshooting (see A/C PRESSURE SWITCH 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.
- Turn the ignition switch OFF.
- Jump the SCS line with the HDS.
- Disconnect PCM connector A (44P).
- Turn the ignition switch ON (II).
- Momentarily connect PCM 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 PCM if it does not have the latest software, or substitute a known-good PCM, then recheck (see PCM UPDATING AND SUBSTITUTION FOR TESTING ). If the symptom/indication goes away with a known-good PCM, replace the original PCM. The air conditioning signal OK.
NO - Check for poor connections or loose terminals at the A/C clutch relay and PCM. If they are OK, check for the A/C clutch relay (see POWER RELAY TEST ), and other A/C systems.