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.
When the ignition switch is turned to the LOCK (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to GROUP 54A, Diagnosis Code Chart .
Go to Step 2.

STEP 2. M.U.T.-III data list
Check the input signals below which are related to the headlamp washer.

  • Ignition switch: ON
  • Headlamp washer switch: ON
Item No.
 Item name
 Normal condition
214
 Head lamp washer
ON
254
 IG voltage
 Battery voltage
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?
All the signals are received normally. : Go to Step 3.
The headlamp washer switch signal is not received. : Refer to GROUP 54A, Input signal procedure 11 "The column switch signal is not received ."
The ignition switch (IG1) signal is not received. : Refer to GROUP 54A, Input signal procedure 2 "The ignition switch (IG1) signal is not received ."

STEP 3. Check the A-53 headlamp washer motor connector

Q. Is the check result normal?
Go to Step4.
Repair the connector.

STEP 4. Check the headlamp washer motor assembly.
Refer to .

Q. Is the check result normal?
Go to Step 5.
Replace the headlamp washer motor.

STEP 5. Resistance measurement at the A-53 headlamp washer motor connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Continuity between A-53 headlamp washer motor connector terminal No.1 and body earth
OK: Continuity (2 Ω OR Less)

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Check the wiring harness between A-53 headlamp washer motor connector terminal No.1 and body earth.

  • Check the earth wires for open circuit.

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 wiring harness.

STEP 7. Check the A-19X headlamp washer relay connector

Q. Is the check result normal?
Go to Step 8.
Repair the connector.

STEP 8. Check the headlamp washer relay.
Refer to .

Q. Is the check result normal?
Go to Step 9.
Replace the headlamp washer relay.

STEP 9. Voltage measurement at the A-19X headlamp washer relay connector.
(1)Remove the headlamp washer relay, and measure at the junction block side.
(2)Check the voltage between the A-19X headlamp washer relay connector terminal No.1, 4 and body earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 11.
Go to Step 10.

STEP 10. Check the wiring harness between A-19X headlamp washer relay connector terminal Nos.1, 4 and the fusible link (34).

  • Check the power supply line from the fusible link (34) for open circuit.

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 wiring harness.

STEP 11. Check the C-312 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 12.
Repair the connector.

STEP 12. Check the wiring harness between C-312 ETACS-ECU connector terminal No.5 and A-19X headlamp washer relay connector terminal No.2.

  • Check the output line for open circuit.

Q. Is the check result normal?
Go to Step 13.
Repair the wiring harness.

STEP 13. Check the wiring harness between A-53 headlamp washer motor connector terminal No.2 and A-19X headlamp washer relay connector terminal No.3.

  • Check the output line to headlamp washer motor for open circuit.

Q. Is the check result normal?
Go to Step 14.
Repair the wiring harness.

STEP 14. 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. Then write the Chassis Number (Chassis No.) of immobiliser system (Refer to GROUP 00, Precautions Before Service - How to Perform Chassis Number (Chassis No.) Writing ).