STEP 1. Check of open circuit, short to ground, and damage in FBAK line between A/C controller assembly (A/C-ECU) connector and blower motor connector.
STEP 2. Check of open circuit, short to ground, and damage in BLOD line between A/C controller assembly (A/C-ECU) connector and blower motor connector.
STEP 3. Voltage measurement at blower motor connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the electric motor switch to the ON position.
(3) Measure the voltage between the blower motor connector M+ terminal and body ground.OK: System voltage
Is the check result normal?
Go to Step 4. Refer to inspection procedure "Blower motor power supply system"
STEP 4. Check of open circuit, and damage in E line between blower motor connector and body ground.
STEP 5. Using scan tool (M.U.T.-IIISE), read the DTC.
STEP 6. Recheck the trouble symptom.
STEP 7. Recheck the trouble symptom.
Is the check result normal?
This diagnosis is complete. Replace the A/C controller assembly (A/C-ECU).