Inspection Procedure H-4: The rear washer does not work.


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


COMMENTS ON TROUBLE SYMPTOM
If the rear washer does not work normally, the input signal circuits to the washer switch, rear washer motor or the ETACS-ECU may be defective.

POSSIBLE CAUSES

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

Step 1. Confirm the operation of the rear wiper.
Check that the rear wiper work normally.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure H-1 "The rear wiper does not work at all ."

Step 2. Pulse check
Check the input signals below which are related to the rear washer.

  • Ignition switch: ACC
System switch
 Check condition
Column switch (rear washer switch)
 When the switch is turned from off to on
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?
Go to Step 3.
Refer to Inspection Procedure P-6 "The column switch (windshield wiper washer and rear wiper washer switch) signal is not received ."

Step 3. Connector check: A-34 washer motor connector.

Q. Is the check result normal?

Go to Step 4.

Repair the connector.

Step 4. Check the washer motor.
Refer to GROUP 51 - Rear wiper and washer .

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

Step 5. Connector check: A-15X front-ECU connector.

Q. Is the check result normal?

Go to Step 6.

Repair the connector.

Step 6. Check the wiring harness between A-34 washer motor connector terminal No.1 to A-15X front ECU connector terminal No.21.



  • Check the earth line for open or short circuit.

Q. Is the check result normal?

Go to Step 7.

Repair the wiring harness.

Step 7. Connector check: C-220 ETACS-ECU connector.

Q. Is the check result normal?

Go to Step 8.

Repair the connector.

Step 8. Check the wiring harness between C-220 ETACS-ECU connector terminal No.23 to A-34 washer motor connector terminal No.2.



note Prior to the wiring harness inspection, check intermediate connector C-125, and repair if necessary.

  • Check the output signal line.

Q. Is the check result normal?

Go to Step 9.

Repair the wiring harness.

Step 9. Replace the ETACS-ECU, and then check its operation.
Replace the ETACS-ECU, and then check that the rear washer works normally.
(1)Replace the ETACS-ECU.
(2)Ignition switch: ON
(3)The rear washer should now work normally.

Q. Is the check result satisfactory?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the front-ECU.