Inspection Procedure D-2

Power Window: The Power Window Timer does not Work Normally.

NOTE: This troubleshooting requires use of scan tool MB991502 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer to "How to use SWS monitor."

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
- Malfunction of front door switches
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS Monitor Kit







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

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502. Also connect SWS monitor kit MB991862 after turning on scan tool MB991502.

1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. After the ignition switch is turned from "ON" position to the "LOCK" (OFF) position, scan tool MB991502 should show "OK" on the "ETACS ECU" menu within approximately one minute.

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 impossible."







STEP 2. Check the input signal by using service data of the SWS monitor.
Check the input signals from the following switches:
- Ignition switch: ON to OFF
- Both front doors: closed




Select "POWER WINDOW" (FUNCTION DIAG.), and check that normal conditions are displayed on the items described in the table.

Q: Does the scan tool display the items "IG SW (IG1)", "DR DOOR SW" and "PASS DOOR SW" as normal condition?

YES: Replace the ETACS-ECU. Check that the power window timer works normally.

NO:
- The scan tool does not show the respective normal condition for item "IG SW (IG1)." Refer to Inspection Procedure O-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 "DR DOOR SW" and "PASS DOOR SW." Refer to Inspection Procedure O-6 "ETACS-ECU does not receive a signal from the driver's or the front passenger's door switch."