Inspection Procedure O-7: Column Switch: ETACS-Ecu Does Not Receive Any Signal From The Taillight Switch, The Headlight Switch, The Passing Light Switch, The Dimmer Switch, The Turn-Signal Light Switch Or 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 Turn-Signal Light And Lighting Switch -
Remove the turn-signal light and the lighting switch. Then check continuity between the switch terminals. See Fig 1. Is the turn-signal light and lighting switch in good condition?
- YES : Go to Step 3.
- NO : Replace it. The input signal from the column switch (turn-signal light and lighting switch) should be able to be checked and the functions, which are described in the TECHNICAL DESCRIPTION (COMMENT) , should work normally.
- Replacement Of ECU -
- Replace the column switch.
- The input signal from the column switch (turn-signal light and lighting switch) should be able to be checked and the functions, which are described in the TECHNICAL DESCRIPTION (COMMENT) , should work normally.
- YES : There is no action to be taken.
- NO : Replace the ETACS-ECU. The input signal from the column switch (turn-signal light and lighting switch) should be able to be checked and the functions, which are described in the TECHNICAL DESCRIPTION (COMMENT) , should work normally.