Inspection Procedure 5: The inside/outside air changeover is impossible. <LHD>

COMMENTS ON TROUBLE SYMPTOM
When inside air cannot be changed to outside air vice versa even if its changeover switch is on, the outside/inside air selection damper control motor system may be defective.

PROBABLE CAUSES

  • Malfunction of the outside/inside air selection damper control motor
  • Damaged the wiring harness or connectors
  • Malfunction of the automatic air conditioner control panel (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 31: Refer to A/C-ECU power supply system <LHD> .

STEP 2. M.U.T.-III actuator test
Carry out the actuator test. (Refer to .)

  • Item 30: In/out changeover dumper: Recirc
  • Item 31: In/out changeover dumper: Fresh

Q. Does the blower motor work normally?
Replace the automatic air conditioner control panel (A/C-ECU).
Go to Step 3.

STEP 3. Connector check: C-10 outside/inside air selection damper control motor connector

Q. Is the check result normal?

Go to Step 4.

Repair the connector.

STEP 4. Voltage measurement at C-10 outside/inside air selection damper control 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 terminal 1 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 6.

Go to Step 5.

STEP 5. Check the wiring harness between C-10 outside/inside air selection damper control motor connector terminal No.1 and the ignition switch (IG2).





note Prior to the wiring harness inspection, check joint connector C-31 and junction block connectors C-205 and C-202, and repair if necessary.

  • Check the motor power supply line for open circuit.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

Repair the wiring harness.

STEP 6. Check the outside/inside air selection damper control motor
Refer to .

Q. Is the check result normal?
Go to Step 7.
Replace the outside/inside air selection damper control motor.

STEP 7. Connector check: C-105 A/C-ECU connector

Q. Is the check result normal?

Go to Step 8.

Repair the connector.

STEP 8. Check the wiring harness between C-105 A/C-ECU connector (terminals 37 and 38) and C-10 outside/inside air selection damper control motor connector (terminals 2 and 3).



  • Check the motor activating lines for open or short circuit.

Q. Is the check result normal?

Replace the automatic air conditioner control panel (A/C-ECU).

Repair the wiring harness.