Inspection Procedure C-6: 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 switch) is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

  • Lamp reminder function
  • Headlamp and tail lamp
  • Turn signal lamp
  • Headlamp washer

PROBABLE CAUSES

  • Malfunction of the lighting 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 .

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

STEP 3. M.U.T.-III diagnosis code.
Check that the ETACS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?
Refer to diagnosis code chart .
Go to Step 4.

STEP 4. Retest the system.
Replace the column switch, and check if the column switch (lighting switch) sends signal.
(1)Replace the lighting switch.
(2)Check if the column switch (lighting switch) sends signal.

Q. Is the check result normal?
The procedure is complete.
Replace the ETACS-ECU.