A/C Signal Circuit Troubleshooting
  1. Measure the voltage between the climate control unit 32P connector terminal No. 20 and body ground.
Is there 0.5 V or less?
YES -
Replace the MICU. ■
NO -
Check for loose wires or poor connections at the climate control unit 32P connector. If the connections are good, substitute a known-good climate control unit and recheck. If the symptom/indication goes away, replace the original climate control unit .■