INSPECTION PROCEDURE G-5: The intermittent wiper interval can not 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. Pulse check
Check the input signals below which are related to the windshield intermittent wiper function.
System switch
 Check condition
Ignition switch (ACC)
 When turned from LOCK (OFF) position to the ACC position
Windshield intermittent wiper volume
 When the windshield intermittent wiper volume is rotated from "FAST" to "SLOW" (a pulse is sent around the volume middle position)
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?
All the signals are received normally. : Go to Step 2.
The ignition switch (IG1) signal is not received. : Refer to inspection procedure P-1 "The ignition switch (ACC) signal is not received ."
The windshield wiper volume signal is not received. : Refer to inspection procedure P-8 "The windshield 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