Test No. 1
CAUTION:
To prevent damage to Scan Tool (MB991504), always turn ignition switch to LOCK (OFF) position before connecting or disconnecting scan tool. Also connect SWS Monitor Kit (MB991862) after turning ON scan tool.
- Use scan tool to select CHECK on the SWS monitor display. Check the ETACS-ECU. Connect Scan Tool (MB991502) to the data link connector. Connect SWS monitor kit to the column switch connector. After the ignition switch is turned from ON position to the LOCK (OFF) position, scan tool should show OK on the ETACS ECU menu within approximately one minute. Is OK displayed on the ETACS ECU menu? If YES, go to next step. If NO, communication with ETACS-ECU is faulty. Recheck all connections to ensure communication with ETACS-ECU. Repair as necessary.
- Check the input signal by using service data of the SWS monitor. Check the input signals from the following switches: Ignition switch from ON to OFF position. Ensure both front doors are closed. Select ETACS ECU (DATA LIST), and check that normal conditions are displayed on the items described in the following table. See ETACS ECU INPUT SIGNALS
table. Does the scan tool display the items IG SW (IG1), DR DOOR SW and PASS DOOR SW as normal condition? If YES, replace the ETACS-ECU. Check that the power window timer works normally. If NO, communication with ETACS-ECU on one or more circuit is faulty. Recheck all connections to ensure communication with ETACS-ECU. Repair as necessary.ETACS ECU INPUT SIGNALS
Item Number Item Name Normal Condition 30 Ignition Switch (IG1) Off 32 Driver Door Switch Off 46 Passenger Door Switch Off