INSPECTION PROCEDURE 5: The Inside/Outside Air Changeover is impossible.












COMMENTS ON TROUBLE SYMPTOM
If the air recirculation cannot be changed by using the inside air/outside air changeover switch, the inside air/outside air changeover motor system may be faulty.

PROBABLE CAUSES

  • Malfunction of the outside/inside air selection damper control motor
  • Malfunction of the A/C control panel
  • Damaged the wiring harness or connectors
  • Malfunction of the A/C-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the operation of the heater control panel
Check that the A/C switch, rear window defogger switch and air volume control dial can operate.

Q. Is the check result normal?
Go to Step 2.
INSPECTION PROCEDURE 16: Refer to A/C-ECU power supply system .

STEP 2. M.U.T.-III diagnosis code
Check that the diagnosis code related to the air conditioner is not set.

Q. Is the diagnosis code set?
Carry out the diagnosis code procedures. Refer to .
Go to Step 3.

STEP 3. M.U.T.-III actuator test
Carry out the actuator test. (Refer to ).

  • Item 05: In/out changeover damper (Select "position reset".)

Q. Does the blower motor work normally?
This diagnosis is complete.
Go to Step 4.

STEP 4. Connector check: C-120 A/C control panel connector and C-111 A/C-ECU connector

Q. Is the check result normal?
Go to Step 5.
Repair the connector.

STEP 5. Check the wiring harness between C-120 A/C control panel connector (terminals 9 and 1) and C-111 A/C-ECU connector (terminals 9 and 10).



  • Check the A/C control panel signal line and earth line for open or short circuit.

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness.

STEP 6. Connector check: C-110 A/C-ECU connector and C-108 outside/inside air selection damper control motor connector

Q. Is the check result normal?
Go to Step 7.
Repair the connector.

STEP 7. Check the wiring harness between C-110 A/C-ECU connector (terminals 29, 24, 27, 25 and 26) and C-108 outside/inside air selection damper control motor connector (terminals 3, 1, 4, 5 and 2).

  • Check the A/C control panel signal line and earth line for open or short circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. Replace the air outside/inside air circulation switching damper motor, and then recheck the trouble symptom.
Check to see that the outside air/inside air circulation switching damper motor operates normally.
note Whenever the motor is replaced, initialise the motor position by using the Actuator Test.

Q. Is the check result normal?
This diagnosis is complete.
Replace the A/C-ECU.