Inspection Procedure 4: The Intermittent Wiper Interval cannot be Adjusted by Operating The Windshield Intermittent Wiper Volume Control.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the column switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code.
When the ignition switch is turned to the "LOCK" (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to GROUP 54A, Diagnosis Code Chart .
Go to Step 2.

STEP 2. M.U.T.-III data list
Check the input signals below which are related to the windshield intermittent wiper function.
Item No.
 Item name
 Normal condition
86
 Intermittent wiper interval
 Operation duration is influenced by the intermittent wiper interval adjusting knob position.
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 3.
Refer to GROUP 54A Inspection Procedure C-1 "The Column Switch (lighting and wiper switch) signal is not received ."

STEP 3. Retest the system.
Check that the windshield intermittent wiper interval can be adjusted by operating the windshield intermittent wiper volume control.
OK: The intermittent wiper interval is changed as the intermittent wiper volume is rotated.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.