INSPECTION PROCEDURE
1: The windshield wipers do not work at all.
caution
Whenever ECU is replaced, ensure that the input
and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
The windshield wiper motor, the column switch (column-ECU) or the ETACS-ECU may be defective.
Also check the wiper backup circuit (between C-210 column switch connector terminal No. 8 and
C-301 ETACS-ECU connector terminal No. 21), and repair if necessary.
PROBABLE CAUSES
Defective windshield 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?
Diagnose the ETACS-ECU. Refer to .
Go to Step 2.
STEP 2. M.U.T.-III data list
Check the input signal related to the windshield 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 A-09 windshield wiper motor connector
Q.
Is the check result normal?
Go to Step 4.
Repair the connector concerned.
STEP 4. Check the windshield wiper motor.
Check that the windshield wiper motor works normally. Refer to .
Q.
Is the check result normal?
Go to Step 5.
Replace the windshield wiper motor.
STEP 5. Measure the resistance at the A-09 windshield wiper motor
connector.
(1)Disconnect the connector, and measure the resistance at the wiring harness.
(2)Measure the resistance between A-09 windshield wiper motor connector terminal Nos.5 <LHD>
or 4 <RHD> 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-09 windshield wiper motor
connector terminal Nos. 5 <LHD> or 4 <RHD> and body earth.
Check the earth wires for open circuit.
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 ).
Repair the wiring harness.
STEP 7. Check the C-304 ETACS-ECU connector
Q.
Is the check result normal?
Go to Step 8.
Repair the connector concerned.
STEP 8. Measure the voltage at the C-304 ETACS-ECU connector.
(1)Disconnect the connector, and measure the voltage at the wiring harness side.
(2)Measure the voltage between C-304 ETACS-ECU connector terminal No. 1 and body earth. OK: Battery voltage
Q.
Is the check result normal?
Go to Step 10.
Go to Step 9.
STEP 9. Check the wiring harness between C-309 ETACS-ECU connector
terminal No. 1 and fusible link (33).
Check the power supply line for open circuit.
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 ).
Repair the wiring harness.
STEP 10. Check the wiring harness between C-304 ETACS-ECU connector
terminal Nos. 5, 6 and A-09 windshield wiper motor connector terminal Nos.1 <LHD> or 5 <RHD> and
4 <LHD> or 3 <RHD>.
Check the input and output lines for open or short circuit.
Q.
Is the check result normal?
Go to Step 11.
Repair the wiring harness.
STEP 11. Retest the system.
Check that the windshield wipers work 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 ).
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Diagnose the ETACS-ECU. Refer to 
.
Go to Step 2.