Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Air Conditioning Signal: RSX
2004 Acura 3.5RLSECTION RSX
- 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 .
- 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.
- 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.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.