Inspection Procedure
: The headlamp washer does not work (Not using SWS monitor).
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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 headlamp washer motor, the column switch or
the front-ECU may be defective.
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- Malfunction of the headlamp washer 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: A-47 headlamp washer 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 headlamp washer motor assembly.
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Refer to GROUP 51 - Headlamp washer .
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the headlamp washer
motor.
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Step 5. Resistance measurement at the A-47 headlamp washer motor
connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Continuity between A-47 headlamp washer motor connector
terminal No.2 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 A-47 headlamp washer motor
connector terminal No.2 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-08X 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-08X front-ECU
connector.
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(1)Remove the front-ECU, and measure at the junction block
side.
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(3)Check the voltage between the A-08X front-ECU connector
terminal No.9 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-08X front-ECU connector
terminal No.9 and the fusible link (4).
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- Check the power supply line 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-47 headlamp washer motor
connector terminal No.1 and A-08X front-ECU connector terminal
No.11
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- Check the 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 headlamp washer should now work
normally.
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Q.
s 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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