[55A] HEATER, AIR CONDITIONER AND VENTILATION - - TROUBLESHOOTING - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 9: Malfunction of the A/C-ECU Power Supply System. | PRINT PAGE / INDEX / PRIOR / NEXT

INSPECTION PROCEDURE 9: Malfunction of the A/C-ECU Power Supply System.
COMMENTS ON TROUBLE SYMPTOM The A/C-ECU power system may be defective if the air conditioner, rear window defogger, and outside/inside air selection damper motor all do not operate normally.
TROUBLESHOOTING HINTS Damaged the wiring harness or connectors Malfunction of the manual air conditioner control panel (A/C-ECU)
| DIAGNOSIS
| Step 1. Measure the voltage at C-06 A/C-ECU connector. Disconnect C-06 A/C-ECU connector and measure the voltage at the harness side. Turn the ignition switch to the "ON" position. Measure the voltage between terminal 10 and earth. OK: System voltage Q: Is the check result normal? YES: Go to Step 4. NO: Go to Step 2.
| Step 2. Connector check: C-06 A/C-ECU connector Q: Is the check result normal? YES: Go to Step 3. NO: Repair or replace the connector.
| Step 3. Check the wiring harness between C-06 A/C-ECU connector (terminal 10) and the ignition switch (IG2). NOTE: Prior to the wiring harness inspection, check junction block connectors C-205 and C-203, and repair if necessary. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Repair the wiring harness.
| Step 4. Measure the resistance at C-06 A/C-ECU connector in order to check the earth circuit to the A/C-ECU. Disconnect C-06 A/C-ECU connector, and measure at the wiring harness side. Measure the resistance between terminal 12 and earth. OK: 2 ohms or less Q: Is the check result normal? YES: Replace the manual air conditioner control panel (A/C-ECU). NO: Go to Step 5.
| Step 5. Connector check: C-06 A/C-ECU connector Q: Is the check result normal? YES: Go to Step 6. NO: Repair or replace the connector.
| Step 6. Check the wiring harness between C-06 A/C-ECU connector (terminal 12) and the earth. Q: Is the check result normal? YES: The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ). NO: Repair the wiring harness.

[55A] HEATER, AIR CONDITIONER AND VENTILATION - - TROUBLESHOOTING - SYMPTOM PROCEDURES - INSPECTION PROCEDURE 9: Malfunction of the A/C-ECU Power Supply System. | PRINT PAGE / INDEX / PRIOR / NEXT

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