RL V6-3.7L (2009)
A/C Signal: Testing and Inspection
A/C Signal Circuit Troubleshooting
1. Start the engine.
2. Turn the blower switch on.
3. Turn the A/C switch on.
4. 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 pressure sensor circuit troubleshooting. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/B Code Charts/B2979
5. Check the A/C system.
Does the A/C system operate?
YES - The air conditioning system circuit is OK.
NO - Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Turn the ignition switch to ON (II).
8. 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: Heating and Air Conditioning/Testing and Inspection/Component Tests and General Diagnostics/A/C
System Test
NO - Go to step 9.
9. Momentarily connect PCM connector terminal E27 to body ground with a jumper wire several times.
Is there a clicking noise from the A/C compressor clutch?
YES - Update the PCM if it does not have the latest software, See: Testing and Inspection/Programming and Relearning/PCM Update or
substitute a known-good PCM, See: Testing and Inspection/Initial Inspection and Diagnostic Overview then recheck. If the
symptom/indication goes away with a known-good PCM, replace the original PCM. See: Engine Control Module/Service and Repair
NO - Check for poor connections or loose terminals at the A/C compressor clutch relay in the under-hood fuse/relay box and the PCM. If the
connections and the terminals are OK, check the A/C compressor clutch relay, See: Power and Ground Distribution/Testing and
Inspection/Power Relay Test repair open in the wire between the PCM (E27) and the A/C compressor clutch relay.