INSPECTION PROCEDURE P-6: The column switch (windshield wiper washer and rear wiper washer switch) signal is not received.


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


COMMENTS ON TROUBLE SYMPTOM
Input signal from the column switch (wiper switch) is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

  • Windshield wiper and washer
  • Rear wiper and washer
  • Headlamp washer

POSSIBLE CAUSES

  • Malfunction of the column switch
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ECU check by using the SWS monitor
Check that the power supply and earth lines to the column switch (column-ECU) and the SWS communication lines are normal.

  • Ignition switch: OFF
ECUS TO BE CHECKED
  • COLUMN ECU
OK: "OK" is displayed on the "COLUMN ECU" menu.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure A-2 "Communication with column switch (column-ECU) is not possible ."

Step 2. SWS monitor data list.
<Selected item> COLUMN ECU
    Operate each function of the switch.
Item No.
 Item name
 Normal condition
Item 05
 INT WIPER SW
 ON
Item 06
 LO WIPER SW
 ON
Item 07
 HI WIPER SW
 ON
Item 08
 MIST WIPER SW
 ON
Item 09
 FRONT WASH.SW
 ON
Item 13
 REAR WIPER SW
 ON
Item 14
 REAR WASH.SW
 ON
OK: Normal conditions are displayed for all the functions of the switch.

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 column switch.