STEP 1. Check the compressor operation
STEP 2. M.U.T.-IIISE actuator test
Carry out the actuator test.Item No.5: Driver's side air mixing damper position reset
OK: After reset, is the air mixing damper change possible?
Is the check result normal?
This diagnosis is complete. Go to Step 3.
STEP 3. Measure the voltage at the air mixing damper control motor connector (driver's side).
(1) Disconnect the connector and measure at the wiring harness side.
(2) Voltage between air mixing damper control motor connector IG1 terminal and body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage)
Is the check result normal?
Go to Step 6. Go to Step 4.
STEP 4. Check of open circuit short to ground, and damage in IG1 line between air mixing damper control motor connector (Driver's side), body ground and A/C controller assembly (A/C-ECU) connector.
STEP 5. Recheck the trouble symptom.
STEP 6. Check of open circuit short to ground, and damage in DA, DB, DA' and DB' line between air mixing damper control motor connector (Driver's side) and A/C assembly (A/C-ECU) connector.
STEP 7. Check the operation of the air mixing damper (driver's side).
(1) Remove the air mixing damper control motor (driver's side).
(2) Insert an hexagonal wrench to the axis of the air mixing damper (driver's side) and turn it by hand to check whether the air mixing damper (driver's side) works normally.OK: The air mixing damper (driver's side) turns smoothly without tight spots within the range of approximately 80 degrees.
Is the check result normal?
Go to Step 8. Replace the upper case assembly.
STEP 8. Recheck the trouble symptom.
STEP 9. Recheck the trouble symptom.
Is the check result normal?
This diagnosis is complete. Replace the A/C controller assembly (A/C-ECU).