A/C Signal Circuit Troubleshooting
- Turn the ignition switch ON (II).
- Momentarily connect ECM connector terminals A24 and E18 with a jumper wire several times.
- Is there a clicking noise from the A/C compressor clutch?
- YES:
Go to step 3.
- NO:
Go to step 6.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
- Start the engine.
- Turn the blower switch ON.
- Turn the A/C switch ON.
- Does the A/C operate?
- YES:
The air conditioning signal is OK.
- NO:
Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck (see ECM UPDATING AND SUBSTITUTION FOR TESTING
). If the symptom/indication goes away with a known-good ECM, replace the original ECM.
- Momentarily connect under-hood fuse/relay box 14P connector terminal No. 10 to body ground with a jumper wire several times.
- Is there a clicking noise from the A/C compressor clutch?
- YES:
Repair open in the wire between the ECM (E18) and the A/C clutch relay.
- NO:
Check the A/C system for other symptoms.
Courtesy of AMERICAN HONDA MOTOR CO., INC.