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A/C System Does Not Operate

WARNING: This page is about a different car, the 1998 Acura 2.5TL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect A/C pressure switch connector and turn ignition on. Check for voltage between Blue/Black wire terminal and ground. 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 ECM 16-pin connector terminal No. 3 (Blue/Black wire) and ground with ECM connectors connected.
  2. If approximately 5 volts exist, repair open Blue/Black wire between A/C pressure switch and ECM. If approximately 5 volts does not exist, check for loose wires or poor connections at ECM 16-pin connector. If connections are okay, substitute known-good ECM and recheck. If symptom goes away with known-good ECM, replace original Engine Control Module (ECM).
  3. Turn ignition off. Check A/C pressure switch 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 climate control unit 20-pin connector terminal No. 10 (Pink wire) and ground. 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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