|
|
TROUBLESHOOTING HEATER, AIR CONDITIONER AND VENTILATION 55-28 YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points - NO : Repair the connector(s) or wiring harness. STEP 3. Check of open circuit in blower motor NOTE: Prior to the wiring harness inspection, check Q: Is the check result normal? YES : Go to Step 4. NO : Repair the connector(s) or wiring harness. STEP 4. Retest the system. Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points - NO : Replace the ETACS-ECU. INSPECTION PROCEDURE 12: Heater controller assembly (A/C-ECU) power supply system COMMENTS ON TROUBLE SYMPTOM If the heater controller assembly (A/C-ECU) is not PROBABLE CAUSES • Malfunction of the heater controller assembly (A/C-ECU) • Damaged wiring harness or connectors DIAGNOSTIC PROCEDURE STEP 1. M.U.T.-III other system's diagnosis code Q: Is the diagnosis code set? YES : Carry out the diagnosis code procedures. Refer to GROUP 54A, ETACS-ECU . NO : Go to Step 2. STEP 2. Measure the voltage at the heater wiring harness side. (2) Ignition switch: ON OK: System voltage Q: Is the check result normal? YES : Go to Step 4. NO : Go to Step 3. STEP 3. Check of open circuit in heater controller Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points - NO : Repair the connector(s) or wiring harness. STEP 4. Measure the voltage at the heater wiring harness side. (2) Voltage between terminal No. 19 and body earth OK: System voltage Q: Is the check result normal? YES : Go to Step 6. NO : Go to Step 5. STEP 5. Check of open circuit in heater controller NOTE: Prior to the wiring harness inspection, check Q: Is the check result normal? YES : Intermittent malfunction (Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points - NO : Repair the connector(s) or wiring harness. |