Inspection Procedure 5: The windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper volume control.


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

COMMENTS ON TROUBLE SYMPTOM
The column switch or the ETACS-ECU may be defective.

PROBABLE CAUSES

  • Defective column switch (column-ECU)
  • Malfunction of ETACS-ECU
  • Malfunctions of the wiring harness and connectors

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, Trouble Symptom Chart .)
Go to Step 2.

STEP 2. Check the ETACS customisation function.
Use the ETACS customise function to check that "Front wiper operation" is set to "variable INT" or "vehicle speed dependent".

Q. Is the check result normal?
Go to Step 3.
Use the ETACS customise function to set "Front wiper operation" to "variable INT" or "vehicle speed dependent". Refer to .

STEP 3. M.U.T.-III data list
Check the input signal related to the windshield wiper operation.

  • Ignition switch: ACC
  • Rotate the windshield wiper interval control from (+) to (-) side.
Item No.
 Display on M.U.T.-III
 Check conditions
 Normal condition
Item 359
 Front wiper (interval volume)
 Rotate the windshield wiper interval control from (+) to (-) side.
 Value changes from 0(+) to 254 (-)

Q. Is the check result normal?
Go to Step 4.
Replace the column switch.

STEP 4. Retest the system.
Check that the windshield wiper interval changes when the windshield wiper volume control is rotated.

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.