INSPECTION PROCEDURE 2: The windshield wipers do not work when the wiper switch is at the "INT", "Washer" or "Mist" position. However, the wipers work at low speed when the switch is at the "Lo" and "Hi" position.



caution Whenever the ECU is replaced, ensure that the communication circuit is normal.


COMMENTS ON TROUBLE SYMPTOM


It is assumed that the windshield wipers are in the fail-safe mode due to the LIN bus lines failure.

PROBABLE CAUSES



  • Faulty LIN bus line
  • Malfunction of ETACS-ECU

DIAGNOSTIC PROCEDURE


STEP 1. M.U.T.-III diagnosis code


Check if an ETACS-related diagnosis code is set.

Q. Is the diagnosis code set?

Troubleshoot the ETACS. Refer to GROUP 54A - ETACS.
Go to Step 2.

STEP 2. Retest the system.


Check that the windshield wipers work normally.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.