Inspection Procedure O-8: Column Switch: ETACS-Ecu Does Not Receive Any Signal From Windshield Mist Wiper Switch, Windshield Intermittent Wiper Switch, Windshield Low-Speed Wiper Switch, Windshield High-Speed Wiper Switch Or Windshield Washer Switch: Diagnosis
- Use Scan Tool To Select "ECU CHECK" On The SWS Monitor Display -
Check the column-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.
- Connect scan tool MB991502 to the data link connector. See Figure.
- Connect SWS monitor kit MB991862 to the column switch connector. See Figure.
- When the ignition switch is turned to the "ON" position, scan tool MB991502 should show "OK" on the "COLUMN ECU" menu.
Is "OK" displayed on the "COLUMN ECU" menu?
- YES : Go to Step 2.
- NO : Refer to INSPECTION PROCEDURE A-2: COMMUNICATION WITH THE COLUMN SWITCH (COLUMN-ECU) IS IMPOSSIBLE .
- Check The Windshield Wiper And Washer Switch -
Remove the windshield wiper and washer switch. Then check continuity between the switch terminals. See Fig 1. Are the windshield wiper and washer switch in good condition?
- YES : Go to Step 3.
- NO : Replace the column switch. If the equipment, which are described in CIRCUIT OPERATION , work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.
- Replace The ECU -
- Replace the column switch (turn-signal light and lighting switch).
- If the equipment, which are described in CIRCUIT OPERATION , work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.
- YES : No action to be taken.
- NO : Replace the ETACS-ECU. If the equipment, which are described in CIRCUIT OPERATION , work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.