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Air Conditioning Signal: RSX

WARNING: This page is about a different car, the 2004 Acura 3.5RL, 2003 Acura 3.5RL, 2003 Acura 3.2TL, and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch on. Using fused jumper wire, momentarily connect Gray, 31-pin ECM/PCM harness connector terminal No. 18 to White, 31-pin ECM/PCM harness connector terminal No. 24 several times. See Figure . See appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS. If clicking from A/C clutch is heard, go to next step. If clicking is not heard, go to step  3 .
  2. Start engine. Turn blower and A/C switches on. If A/C operates properly, A/C signal is okay. If A/C does not operate properly, update PCM, if it does not have latest software or substitute known-good ECM/PCM, then recheck. If system operates properly, replace original ECM/PCM.
    NOTE: When substituting PCM, immobilizer code must be rewritten to replacement PCM using Honda PGM tester, or else engine will not start.
  3. Momentarily connect fused jumper wire between under-hood relay box 14-pin harness connector terminal No. 10 and ground several times. If clicking noise is heard from A/C compressor clutch, repair open in Red wire between under-hood relay box 14-pin harness connector terminal No. 10 and Gray, 31-pin ECM/PCM harness connector terminal No. 18. If clicking noise is not heard from compressor, recheck A/C system for other symptoms. See appropriate AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
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