Inspection Procedure 5: 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
The column switch or the front-ECU may be defective.

POSSIBLE CAUSES

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

DIAGNOSIS PROCEDURE

Step 1. SWS monitor data list

  • Rotate the windshield intermittent wiper volume when the vehicle is stopped.
    note Also check that the windshield wiper interval changes smoothly when the windshield intermittent wiper interval adjusting knob is rotated from "SLOW" to "FAST" positions.
Item No.
 Item name
 Normal condition
Item 37
 INT WIPE TIME
 The M.U.T-III displays intermittent wiper interval in response to the intermittent wiper control positions
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 2.
Refer to GROUP 54A - ETACS, Inspection Procedure C-8 "The windshield intermittent wiper volume signal is not received ."

Step 2. 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 Cope with Intermittent Malfunction ).
Replace the front-ECU.