A/C Signal Circuit Troubleshooting

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2015 Honda Crosstour, 2014 Honda Crosstour, 2013 Honda Crosstour, 2012 Honda Crosstour, and 2011 Honda Accord Crosstour. However, it is still accessible from the selected car via links, so may be relevant.

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 next step.

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 next step.
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 TEST ).

NO -Go to next step.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector A (49P).
Turn the ignition switch to ON (II).
Momentarily connect PCM connector terminal A13 to body ground with a jumper wire several times.

Fig 1: Identifying PCM A (49P) Connector Terminal Location
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 (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ).

NO -Check for poor connections or loose terminals at the A/C clutch relay and the PCM. If the connections and the terminals are OK, check the A/C clutch relay (see POWER RELAY TEST ), repair open in the wire between the PCM (A13), and the A/C clutch relay and other A/C parts.