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Air Conditioning Signal: 3.2TL

WARNING: This page is about a different car, the 2000 Acura Integra, 2000 Acura 3.5RL, and 2000 Acura 3.2TL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect A/C pressure switch connector. Turn ignition on. Measure voltage by backprobing between PCM 32-pin connector "A" terminal No. 27 (Blue/Red wire) and PCM 25-pin connector "B" terminal No. 20 (Brown/Yellow wire). If around 5 volts are present, go to next step. If around 5 volts are not present, go to step  3.
  2. Turn ignition off. Reconnect A/C pressure switch connector. Turn ignition on. Momentarily connect jumper wire several times between PCM 32-pin connector "A" terminal No. 17 (Red wire) and PCM 25-pin connector "B" terminal No. 20 (Brown/Yellow wire). If A/C compressor clutch does not make a clicking noise, go to step  4. If A/C compressor clutch makes a clicking noise, start engine. Turn blower switch and A/C on. If A/C operates, A/C signal is okay. If A/C does not operate, go to step  5.
  3. Turn ignition off. Disconnect PCM 32-pin connector "A". Measure continuity between ground and PCM 32-pin connector "A" terminal No. 27 (Blue/Red wire). If continuity is present, repair short circuit in Blue/Red wire between PCM 32-pin connector "A" terminal No. 27 and A/C pressure switch. If continuity is not present, substitute known-good PCM from donor vehicle. Cut temporary key from a non-immobilizer key blank and tape donor vehicle key to it backwards in order to deactivate immobilizer system during testing. If voltage measured between PCM 32-pin connector "A" terminal No. 27 (Blue/Red wire) and PCM 25-pin connector "B" terminal No. 20 (Brown/Yellow wire) is now around 5 volts, replace original PCM. If measured voltage is not around 5 volts, recheck A/C system. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  4. Momentarily connect jumper wire several times between underhood fuse/relay block 16-pin connector "D" terminal No. 11 (Red wire) and ground. If A/C compressor clutch makes a clicking noise, repair open circuit in Red wire between PCM 32-pin connector "A" terminal No. 17 and A/C clutch relay. If A/C compressor does not make a clicking noise, problem is with A/C system. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  5. Measure voltage between PCM 32-pin connector "A" terminal No. 27 (Blue/Red wire) and PCM 25-pin connector "B" terminal No. 20 (Brown/Yellow wire). If less than one volt is present, replace PCM. If one volt or more is present, repair open circuit in Blue/Red wire between PCM 32-pin connector "A" terminal No. 27 and A/C pressure switch.
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