INSPECTION PROCEDURE P-5: The column switch (lighting, turn-signal lamp and headlamp 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 (lighting, turn-signal lamp and headlamp washer switch) is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

  • Lamp reminder function
  • Headlamp washer
  • Headlamp and tail lamp
  • Headlamp automatic-shutdown function
  • Front and rear fog lamp
  • Turn signal lamp
  • Headlamp washer

POSSIBLE CAUSES

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

DIAGNOSIS PROCEDURE

Step 1. Check the column switch connector.
Check that the wiper and washer switch connector, the lighting switch connector and the switch body connector are in good condition.

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

Step 2. Check the column switch (lighting switch and switch body).
Refer to GROUP 54A - Column switch .

Q. Is the check result normal?
Go to Step 3.
Replace the column switch.

Step 3. 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 4.
Refer to Inspection Procedure A-2 "Communication with the column switch (column-ECU) is not possible ."

Step 4. SWS monitor data list
<Selected item> COLUMN ECU
  • Operate each function of the switch.
Item No.
 Item name
 Normal condition
Item 00
 HEADLAMP SW
 ON
Item 01
 TAIL LAMP SW
 ON
Item 02
 DIMMER SW
 ON
Item 03
 PASSING SW
 ON
Item 10
 TURN SIG.RH
 ON
Item 11
 TURN SIG.LH
 ON
Item 16
 HD WASHER 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.