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 ignition switch to the "ON" position.
(3) Measure the voltage between the blower motor connector M+ terminal and body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Go to Step 4. Refer to inspection procedure 10 "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. M.U.T.-IIISE DTC Check that DTC No.B1191, B1192 or B1193 is also set.
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).