Inspection Procedure O-16

INSPECTION PROCEDURE 0-16: Column Switch: The Windshield Mist Wiper Switch, Windshield Intermittent Wiper Switch, Windshield Low-speed Wiper Switch, Windshield High-speed Wiper Switch or Windshield Washer Switch Signal is not Sent to the ETACS-ECU.

CIRCUIT OPERATION
The ETACS-ECU calculates the windshield intermillent wiper interval according to the resistance of the windshield intermittent wiper interval adjusting knob, which is incorporated in the column switch (windshield wiper and windshield washer switch).

TECHNICAL DESCRIPTION (COMMENT)
The column switch (windshield wiper and washer switch) input signal is used to operate the windshield wiper and washer. If the signal fails, windshield wiper and washer will not work normally.

TROUBLESHOOTING HINTS

- Malfunction of the column switch (windshield wiper and washer switch)
- Malfunction of the ETACS-ECU
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.

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.

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. Testing and Inspection

NO: Go to Step 2.






STEP 2. Check the windshield wiper and washer switch.






Q: Is the windshield and washer switch in good condition?

YES: Go to Step 3.

NO: Replace it. The input signal from the column switch (windshield wiper and washer switch) should be able to be checked and the windshield wiper and washer should work normally.

STEP 3. Replacement of ECU

(1) Replace the column switch (turn-signal light and lighting switch).
(2) The input signal from the column switch (windshield wiper and washer switch) should be able to be checked and the windshield wiper and washer should work normally.

Q: Is the input signal from the column switch (windshield wiper and washer switch) input normally?

YES: There is no action to be taken.

NO: Replace the ETACS-ECU. The input signal from the column switch (windshield wiper and washer switch) should be able to be checked and the windshield wiper and washer should work normally.