[55B] AUTOMATIC AIR CONDITIONER - - TROUBLESHOOTING - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 1: Communication with the MUT-II/III is not possible. | PRINT PAGE / INDEX / PRIOR / NEXT

| SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with the MUT-II/III is not possible.
| COMMENTS ON TROUBLE SYMPTOM If communication with all other systems is not possible, there is a high possibility that there is a malfunction of the diagnosis line. If only the A/C system can not communicate with the MUT-II/III, the diagnosis line between the A/C-ECU and the diagnosis connector may be defective.
| POSSIBLE CAUSES Damaged the wiring harness or connectors Malfunction of the automatic air conditioner control panel (A/C-ECU)
| DIAGNOSIS
| Step 1. Check the communication with other systems. Q: Is the communication with the other systems possible using the MUT-II/III? YES: Go to Step 2. NO: Check the diagnosis line using the MUT-II/III, and repair if necessary.
| STEP 2. Check operations of the air conditioner, defogger and outside/inside air selection damper control motor. Q: Does the air conditioner, defogger or outside/inside air selection damper control motor operate? YES: Go to Step 3. NO: Refer to Inspection procedure 10 "Malfunction of the A/C-ECU power supply system ."
| Step 3. Connector check: C-27 A/C-ECU connector and C-24 diagnosis connector Q: Is the check result normal? YES: Go to Step 4. NO: Repair the connector.
| Step 4. Check the wiring harness between C-27 A/C-ECU connector (terminal 17 and 18) and C-18 diagnosis connector (terminal 11 and 1). Check the input and output lines for open or short circuit. Q: Is the check result normal? YES: Replace the automatic air conditioner control panel (A/C-ECU) NO: Repair the wiring harness.

[55B] AUTOMATIC AIR CONDITIONER - - TROUBLESHOOTING - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 1: Communication with the MUT-II/III is not possible. | PRINT PAGE / INDEX / PRIOR / NEXT

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