Inspection Procedure 1: The windshield wipers do not work at
all.
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Whenever the ECU is replaced, ensure that the input
and output signal circuits are normal.
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COMMENTS ON TROUBLE SYMPTOM
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The windshield wiper motor, the column switch
or the front-ECU may be defective. If a problem is found in the ECU check
by using the SWS monitor, also check the wiper backup circuit (between
D-311 column switch connector terminal No.8 and A-09X front-ECU connector
terminal No.26) and repair if necessary.
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- Malfunction of the windshield wiper motor
- Malfunction of the column switch
- Malfunction of the front-ECU
- Damaged harness wires and connectors
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Step 1. M.U.T.-III diagnosis code
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When the ignition switch is turned to the LOCK
(OFF) position, check that the ETACS-ECU does not set the diagnosis
code.
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Q.
Is the diagnosis code set?
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 Refer
to GROUP 54A - ETACS, Diagnosis code chart  .
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 Go to Step 2.
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Check the input signals below which are related
to the windshield wiper.
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System
switch
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Check
condition
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Ignition switch
(ACC)
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When turned from the LOCK
(OFF) position to the ACC position.
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Windshield mist wiper
switch
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When the switch is turned
from off to on.
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OK: The M.U.T.-III sounds or the
voltmeter needle fluctuates.
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Q.
Are the check result normal?
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All the signals are received normally : Go to Step
3.
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The ignition switch (ACC) signal is not
received. : Refer to GROUP 54A - ETACS, Inspection procedure C-1 "The
ignition switch (ACC) signal is not received ."
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Windshield mist wiper switch signal is not
received. : Refer to GROUP 54A - ETACS, Inspection procedure C-7 "The
column switch (windshield wiper washer and rear wiper washer switch) signal
is not received ."
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Step 3. Connector check: B-09 windshield wiper motor
connector.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair
the connector.
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Step 4. Check the windshield wiper motor assembly.
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Refer to .
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the windshield wiper motor
assembly.
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Step 5. Resistance measurement at the B-09 windshield wiper motor
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Continuity between B-09 windshield wiper motor connector
terminal No.5 and body earth.
OK: Continuity (2 Ω or
less)
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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Step 6. Check the wiring harness between B-09 windshield wiper motor
connector terminal No. 5 to body earth.
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- Check the earth wires for open circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Repair
the wiring harness.
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Step 7. Connector check: A-09X front-ECU connector.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair
the connector.
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Step 8. Voltage measurement at the A-09X front-ECU
connector.
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(1)Remove the front-ECU, and measure at the relay box
side.
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(3)Check the voltage between the A-09X front-ECU connector
terminal No.24 and body earth.
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 9.
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Step 9. Check the wiring harness between A-09X front-ECU connector
terminal No.24 and the ignition switch (ACC).
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Prior to the wiring harness inspection, check the
intermediate connector D-238 and repair if necessary.
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- Check the power supply line to the ignition switch (ACC) for open
circuit.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Repair
the wiring harness.
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Step 10. Check the wiring harness between A-09X front-ECU connector
terminal Nos. 27 and 28, and B-09 windshield wiper motor connector
terminal Nos. 1 and 4.
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Prior to the wiring harness inspection, check the
intermediate connector A-05 and repair if necessary.
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- Check the input and output line for open circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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Step 11. Retest the system.
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The windshield wiper should now work normally
at all.
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Q.
Is the check result normal?
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The
trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Replace the front-ECU.
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