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A/C System Does Not Operate

WARNING: This page is about a different car, the 1998 Acura 3.2TL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect radiator fan relay connector, condenser fan relay connector, and A/C pressure switch connector. Turn ignition on. Check for voltage between ground and A/C pressure switch connector Blue/Black wire terminal. If approximately 5 volts exists, go to step 3). If approximately 5 volts does not exist, use Backprobe Set (07SAZ-001000A) to check for voltage between ground and Powertrain Control Module (PCM) 16-pin connector terminal No. 3 (Blue/Black wire) with PCM connectors connected.
  2. If approximately 5 volts exist, repair open Blue/Black wire between A/C pressure switch and PCM. If approximately 5 volts does not exist, check for loose wires or poor connections at PCM 16-pin connector. If connections are okay, substitute known-good PCM and recheck. If symptom goes away with known-good PCM, replace original PCM.
  3. Turn ignition off. Check for continuity between A/C pressure switch Blue/Black wire terminal and Pink wire terminal for continuity. If continuity exists, go to next step. If continuity does not exist, check A/C system pressure. See A/C SYSTEM PERFORMANCE  under TESTING. If A/C system pressure is not within specifications, repair A/C system. If A/C system pressure is okay, replace A/C pressure switch.
  4. Reconnect A/C pressure switch. Remove climate control unit and disconnect 20-pin connector. Turn ignition on. Check for voltage between ground and climate control unit 20-pin connector terminal No. 10 (Pink wire). See Figure . If approximately 5 volts does not exist, repair open Pink wire between A/C pressure switch and climate control unit.
  5. If approximately 5 volts exist, check for loose wires or poor connections at climate control unit 20-pin connector. If connections are okay, substitute known-good climate control unit and recheck. If symptom goes away with known-good climate control unit, replace original climate control unit.
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