Inspection Procedure: The headlamp washer does not work.



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

COMMENTS ON TROUBLE SYMPTOM


The headlamp washer motor, the headlamp washer relay, the column switch or the ETACS-ECU may be defective.

POSSIBLE CAUSES



  • Malfunction of the headlamp washer motor
  • Malfunction of the headlamp washer relay
  • Malfunction of the column switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III diagnosis code.


Check if an ETACS-related diagnosis code is set.

Q. Is the diagnosis code set?

Diagnose the ETACS-ECU (Refer to GROUP 54A - ETACS, Diagnosis Code Chart ).
Go to Step 2.

STEP 2. M.U.T.-III data list.


Check the ETACS-related data list (Refer to GROUP 54A - ETACS, Service Data Reference Table )

  • Set the ignition switch to the ACC position.
  • Operate the headlamp washer wiper switch at ON position.
Item No.
Item name
Normal condition
29
Ignition Switch (ACC)
ON
64
Headlamp washer output
ON
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?

YES <Normal conditions are displayed for all items> : Go to Step 3.
NO <Normal condition is not displayed for item No. 29> : Troubleshoot the ETACS-ECU. Refer to GROUP 54A - ETACS, Inspection Procedure 1 "The ignition switch (ACC) signal is not received" .
NO <Normal condition is not displayed for item No. 64> : Troubleshoot the ETACS-ECU. Refer to GROUP 54A - ETACS, Inspection Procedure 9 "The column switch signal is not received" .

STEP 3. Check the headlamp washer motor assembly.


Check that the headlamp washer motor works normally (Refer to ).

Q. Is the check result normal?

Go to Step 4.
Replace the headlamp washer motor (Refer to ).

STEP 4. Resistance measurement at headlamp washer motor connector (earth terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Continuity between headlamp washer motor connector (earth terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 6.
Go to Step 5.

STEP 5. Check of open circuit in earth line between headlamp washer motor connector and body earth.


Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.

STEP 6. Check the headlamp washer relay.


Check that the headlamp washer relay works normally (Refer to ).

Q. Is the check result normal?

Go to Step 7.
Replace the headlamp washer relay.

STEP 7. Voltage measurement at headlamp washer relay connector (power supply line).


(1)Remove the headlamp washer relay, and measure at wiring harness side.
(2)Check the voltage between headlamp washer relay connector (power supply terminals) and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 9.
Go to Step 8.

STEP 8. Check of the open circuit in power supply line between headlamp washer relay connector and the fusible link.


Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.

STEP 9. Check of the open circuit in H/WAS line between ETACS-ECU connector and headlamp washer relay connector.


Q. Is the check result normal?

Go to Step 10.
Repair the connector(s) or wiring harness.

STEP 10. Check of the open circuit in power supply line between headlamp washer motor connector and headlamp washer relay connector.


Q. Is the check result normal?

Go to Step 11.
Repair the connector(s) or wiring harness.

STEP 11. Retest the system.


The headlamp washer should now work normally.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS, ETACS-ECU ).