Inspection Procedure B-5

INSPECTION PROCEDURE B-5: The Power Window Timer Function does not Work Normally.

CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)

If the power window timer function does not work normally, a malfunction of the power window main switch or ETACS-ECU is suspected.

TROUBLESHOOTING HINT

- Malfunction of the driver's door switch
- Malfunction of the front passenger's door switch
- Malfunction of the power window main switch
- Malfunction of ETACS-ECU
- Damaged wiring harness and connectors

DIAGNOSIS

STEP 1. Check the power supply system.

With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:

- Hazard warning light

Q. Is the check result normal?

YES Go to Step 2.
NO Symptom Procedures.
STEP 2. Using scan tool MB991958, check data list.

Check the signals related to the power window timer function operation.

(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

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

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

(3)Check the data list of the ETACS.

- Turn the ignition switch to the LOCK (OFF) position.
- Close the driver's door.
- Close the front passenger's door.





(4)Turn the ignition switch to the "LOCK" (OFF) position.
OK: Normal condition is displayed.


Q. Is the check result normal?

YES [Normal conditions are displayed for all the items.] : Go to Step 3.
NO [Normal condition is not displayed for item No. 254.] : Inspection Procedure 2."
NO [Normal condition is not displayed for item No. 256.] : Inspection Procedure 6."
NO [Normal condition is not displayed for item No. 257.] : Inspection Procedure 5.
STEP 3. Retest the system.

Check that the power window timer function works normally.

Q. Is the check result normal?

YES No action is necessary and testing is complete.
NO Replace the power window main switch. Check that the power window timer function works normally.