Inspection Procedure D-2

Power Windows: The power window timer function does not work normally.

Power Window Timer Function Circuit:

CIRCUIT OPERATION
The ETACS-ECU operates the power window timer function according to the following signals:
- Ignition switch (IG1)
- Front door switch

TECHNICAL DESCRIPTION (COMMENT)
If the power window timer function does not work normally, its input circuit, the ETACS-ECU or the front-ECU may be defective.

TROUBLESHOOTING HINTS
- The front door switches may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B
- MB991862: SWS monitor kit

STEP 1. Use scan tool MB991958 to select "ECU COMM CHK" on the SWS monitor display.
Check the ETACS-ECU.

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 the DLC harness before connecting the column-ECU harness. Be sure to connect SWS monitor kit MB991862 after turning on scan tool MB991958.







1. Connect scan tool MB991958 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate scan tool MB991958 according to the procedure below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

5. Scan tool MB991958 should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed on the "ETACS ECU" menu?

YES: Go to Step 2.

NO: Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible."

STEP 2. Check the input signal by using "DATA LIST" menu of the SWS monitor.







1. Check the input signals from the following switches:
- Ignition switch: ON to OFF
- Driver's and front passenger's doors: closed

2. Operate scan tool MB991958 according to the procedure below to display "ETACS ECU."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "ETACS ECU."




3. Check that normal conditions are displayed on the items described in the table.

Q: Are normal conditions displayed on the "IG SW (IG1)" and "FRONT DOOR SW"?

Normal conditions are displayed for all the items: Replace the ETACS-ECU. Verify that the power window timer works normally.

The scan tool does not show the respective normal condition for item "IG SW (IG1)" : Refer to Inspection Procedure N-2 "ETACS-ECU does not receive a signal from the ignition switch (IG1)."

The scan tool does not show the respective normal condition for item "FRONT DOOR SW" : Refer to Inspection Procedure N-4 "ETACS-ECU does not receive a signal from the driver's door switch."