INSPECTION PROCEDURE O-14: Column switch: The taillight switch, headlight switch, passing light switch, dimmer switch or turn-signal light switch signal is not sent to the ETACS-ECU.: Diagnosis
Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991529: Diagnostic Trouble Code Check Harness
- STEP 1. Verify the ignition switch positions.
Q: Does a diagnostic trouble code set when the ignition switch is at any of the positions?
YES : Carry out the troubleshooting by referring to the Diagnostic Trouble Code Chart. Refer to DIAGNOSTIC TROUBLE CODE CHART .
NO: Go to Step 2.
- STEP 2. Check the turn-signal light and lighting switch. TESTER CONNECTION SPECIFIED CONDITION CHART
SWITCH POSITION TESTER CONNECTION SPECIFIED CONDITION OFF 5 - 9, 7 - 9, 1 - 2, 2 - 3, 2 - 11, 2 - 12 Open circuit Taillight switch 5 - 9 Less than 2 ohms Headlight switch 5 - 7 - 9 Less than 2 ohms Passing switch 2 - 12 Less than 2 ohms Dimmer switch 2 - 11 - 12 Less than 2 ohms Turn-signal light switch (LH) 1 - 2 Less than 2 ohms Q: 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.
- STEP 3. 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.
Q: Is the input signal from the column switch (turn-signal light and lighting switch) input normally?
YES : No action is necessary and testing is complete.
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.