Inspection Procedure 8

INSPECTION PROCEDURE 8: Air Outlet Vent cannot be Changed.










CIRCUIT OPERATION

If the air outlet cannot be switched, the mode selection damper control motor circuit may be failed.

TROUBLESHOOTING HINTS

- Malfunction of the mode selection damper control motor
- Malfunction of the A/C-ECU
- Damaged wiring harness or connectors

DIAGNOSIS

STEP 1. Using scan tool MB991958, check for diagnostic trouble code.

Check if an A/C-ECU DTC is set.

(1)Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."

(2)Turn the ignition switch to the "ON" position.

(3)Check if the DTC is set.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Refer to DIAGNOSTIC TROUBLE CODE CHART Manual Air Conditioning.
NO Go to Step 2.
STEP 2. Check mode selection damper control motor connector C-206 and A/C-ECU connector C-209 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are mode selection damper control motor connector C-206 and A/C-ECU connector C-209 in good condition?

YES Go to Step 3.
NO Repair or replace the connector. Harness Connector Inspection. Check that the A/C works normally.
STEP 3. Check the wiring harness between A/C-ECU connector C-209 (terminals 29, 31, 32, 30 and 33) and mode selection damper control motor connector C-206 (terminals 3, 2, 5, 4 and 1).

- Check the A/C-ECU signal line for open and short circuit.

Q. Are the wiring harness between A/C-ECU connector C-209 (terminals 29, 31, 32, 30 and 33) and mode selection damper control motor connector C-206 (terminals 3, 2, 5, 4 and 1) in good condition?

YES Go to Step 4.
NO Repair the wiring harness. Check that the A/C works normally.
STEP 4. Replace the mode selection damper control motor and check the trouble symptom again

Check the trouble symptom again.

Q. Is the check result satisfactory?

YES The procedure is complete.
NO Replace the A/C-ECU.