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 test.
Check the A/C system. Does the A/C system operate?
YES | - | The air conditioning signal 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 | - | Go to the A/C system for the other symptoms.■
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. 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, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM / PCM .■