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
Malfunction of ETACS-ECU
Defective column switch (column-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 GROUP 54A - ETACS .
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.
Operate the windshield wiper switch at each switch position.
Item No.
Item name
Windshield wiper switch position
Normal condition
Item 235
Front wiper ACT
LO
ON
HI
INTO
ON and OFF
MIST
ON
Item 288
ACC switch
ON
OK: Normal condition is displayed.
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. 235> : Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis - Inspection Procedure 12
"Column switch signal is not received." .
NO <Normal condition is not displayed for item No. 288> : Refer to GROUP 54A, ETACS, Diagnosis - 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 No. 5 <LHD> or No. 4 <RHD>
windshield wiper motor connector terminal and body earth. OK: Continuity exists (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 No. 5 <LHD> or No. 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-309 ETACS-ECU connector.
(1)Disconnect the connector, and measure the voltage at the wiring harness side.
(2)Measure the voltage between C-309 ETACS-ECU connector terminal No. 1 and body earth. OK: System 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 ).
)
)
)
)
)
)
)
Diagnose the ETACS-ECU. Refer to GROUP 54A - ETACS 
.
Go to Step 2.
: Go to Step 3.