Inspection Procedure K-7: The wiper-linked auto lamp function does not work normally.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM
If this function does not work normally, the input signal circuit(s) below or the ETACS-ECU may be defective.

  • Automatic lighting switch
  • Windshield wiper switch

POSSIBLE CAUSES

  • The lighting switch is defective
  • The windshield wiper switch is defective.
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the operation of the windshield wipers.
Check that the windshield wipers work normally by operating the relevant switches.

Q. Is the check result normal?
Go to Step 2.
Refer to inspection procedure G-4 "The windshield wipers do not operate as predetermined.

Step 2. Checking auto lamp operation
Check that the auto lamp function works normally.

Q. Is the check result normal?
Go to Step 3.
Refer to Inspection Procedure K-6 "The auto lamp function does not work normally ."

Step 3. Customize function by using the SWS monitor
Use the SWS monitor customization function to confirm that "WIPR-LINK H/L" is set to "W.FUNCTION."
caution The SWS monitor must be used in order to confirm and change that setting. Use the SWS monitor to confirm and/or change the customized function.

Q. Is the check result normal?
Go to Step 4.
Use the SWS monitor customization function to set "WIPR-LINK H/L" to "W.FUNCTION" (Refer to ).

Step 4. Retest the system.
Check that the wiper-linked auto-lamp function works normally.

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 ETACS-ECU.