Inspection Procedure O-17
Column switch:- The taillight switch signal is not sent to the ETACS-ECU.
- The headlight switch signal is not sent to the ETACS-ECU.
- The passing light switch signal is not sent to the ETACS-ECU.
- The dimmer switch signal is not sent to the ETACS-ECU.
- The turn-signal light switch signal is not sent to the ETACS-ECU.
Turn-signal Light And Lighting Switch Input Circuit:
CIRCUIT OPERATION
The ETACS-ECU uses the input signal from the column switch (turn-signal light and lighting switch) to operate various functions.
TECHNICAL DESCRIPTION (COMMENT)
The column switch (turn-signal light and lighting switch) input signal is used to operate the following devices or functions. If the signal fails these devices will not work normally.
- Light reminder tone alarm function
- Headlight
- Headlight automatic shutdown function
- Headlight dimmer switch automatic resetting function
- Turn-signal light
- Fog light
TROUBLESHOOTING HINTS
- Malfunction of the column switch (turn-signal light and lighting switch)
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
MB991223: Test Harness Set
MB991502: Scan Tool (MUT-II)
MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the ignition switch positions.
If a diagnostic trouble code sets when the ignition switch is at any of the positions, carry out the troubleshooting by referring to the Diagnostic Trouble Code Chart.
If a diagnostic trouble code does not set, go to Step 2.
STEP 2. Check the turn-signal light and lighting switch.
If the turn-signal light and lighting switch is damaged, 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.
If the turn-signal light and lighting switch is in good condition, replace the column switch or 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.