INSPECTION PROCEDURE 1: Rear wiper does not work at all.










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

OPERATION
The ETACS-ECU operates the rear wiper in accordance with the input signals below.

  • Ignition switch (ACC)
  • Rear wiper switch

COMMENTS ON TROUBLE SYMPTOM
If the rear wiper does not work normally, the input signal circuits from the ignition switch (ACC), the column switch (column-ECU), the rear wiper motor or ETACS-ECU may be defective.

PROBABLE CAUSES

  • Defective rear wiper motor
  • Defective column switch (column-ECU)
  • Malfunction of ETACS-ECU
  • Malfunctions of the wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Check if an ETACS-related diagnosis code is set.

Q. Is the diagnosis code set?
Troubleshoot the ETACS. Refer to .
Go to Step 2.

STEP 2. M.U.T.-III data list
Check the input signal related to the rear wiper operation.

  • Turn the ignition switch to the ACC position.
Item No.
 Item name
 Normal conditions
Item 288
 ACC switch
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 3.
Refer to GROUP 54A - ETACS, Inspection Procedure 1 "The ignition switch (ACC) signal is not received ."

STEP 3. Check the F-04 rear wiper motor connector

Q. Is the check result normal?

    Go to Step 4.
Repair the defective connector.

STEP 4. Check the rear wiper motor.
Refer to GROUP 51 - Rear Wiper and Washer .

Q. Is the rear wiper motor normal?
Go to Step 5.
Replace the rear wiper motor.

STEP 5. Measure the resistance at the F-04 rear wiper motor connector.
(1)Disconnect the connector, and measure the resistance at the wiring harness.
(2)Measure the resistance between F-04 rear wiper motor connector terminal No. 3 and body earth.
OK:Continuity ( 2Ω or less)

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

STEP 6. Check the wiring harness between F-04 rear wiper motor connector terminal No. 3 and body earth.

  • Check the earth wires for open circuit.

Q. Is the check result normal?

    Go to Step 7.
Repair the wiring harness.

STEP 7. Check the C-311 ETACS-ECU connector

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

STEP 8. Check the wiring harness wires between F-04 rear wiper motor connector terminal No. 1 and C-311 ETACS-ECU connector terminal No. 5.
note Prior to the wiring harness inspection, check intermediate connector D-12, and repair if necessary.

  • Check the power supply line for open or short circuit.

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 9. Retest the system.
Check that the rear wiper works normally.

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.