Inspection Procedure
: The headlamp washer does not work (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. ECU check by using the SWS monitor.
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Check that the power supply and earth lines to
the column switch (column-ECU) and the
front-ECU and the SWS communication lines are normal.
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- Turn the ignition switch to the ON position.
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OK: "OK" is displayed for all the
items
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Q.
Are the check result normal?
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"OK" is displayed for all the items : Go to Step
2
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"NG" is displayed on the "COLUMN ECU" menu. :
Refer to GROUP 54C - SWS, Inspection Procedure 1 "Communication with the
column
switch (column-ECU) is not possible  ."
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"NG" is displayed on the "FRONT ECU" menu. :
Refer to GROUP 54C - SWS, Inspection Procedure 3 "Communication with the
front-ECU
is not possible ."
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Step 2. Function diagnosis by using the SWS monitor
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Check the SWS communication signal, which are
related to the headlamp washer function.
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Selected item HD WASHER
- Turn the ignition switch to the ACC position.
- Headlamp washer switch: ON
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Item No.
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Item name
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Normal
condition
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Item 16
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HD WASHER SW
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ON
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Item 31
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IG SW (ACC)
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ON
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Item 70
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FRONT ECU ACK
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NORMAL ACK or HI-BEAM
ACK
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OK: Normal conditions are displayed
for all the items.
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Q.
Are the check result normal?
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Normal conditions are displayed for all the
items : Go to
Step 3.
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Normal condition is not displayed for item
No.16 : Replace the column switch.
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Normal condition is not displayed for item
No.31 : Refer to GROUP 54A - ETACS, Inspection procedure C-1 "The ignition
switch (ACC)
signal is not received ."
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Normal condition is not displayed for item
No.70 : Replace the front-ECU.
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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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