Inspection Procedure C-1: The ignition switch (ACC) signal is not
received.
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Whenever the ECU is replaced, ensure that the input
signal circuit is normal.
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COMMENTS ON TROUBLE SYMPTOM
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Input signal from the ignition switch (ACC) is
used to operate the functions below. If the signal is abnormal, these
functions will not work normally.
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- Windshield wiper and washer
- Rear wiper and washer
- Headlamp washer
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- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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STEP 1. Connector check: D-419 ETACS-ECU connector
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair
the defective connector.
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STEP 2. Voltage measurement at the D-419 ETACS-ECU
connector.
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(1)Remove the ETACS-ECU, and measure at the junction block
side.
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(2)Ignition switch: ACC position
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(3)Voltage between D-419 ETACS-ECU connector terminal No.4
and body earth
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check the wiring harness between D-419 ETACS-ECU connector
terminal No.4 and the ignition switch (ACC).
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| note |
Prior to the wiring harness inspection, check
junction block connector D-401, intermediate connectors D-238 and D-241,
and repair if necessary.
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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 use troubleshooting/Inspection Service Points  ).
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Repair
the wiring harness.
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STEP 4. Retest the system.
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Check that the ignition switch (ACC) signal is
received normally.
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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 use troubleshooting/Inspection Service Points ).
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Replace the ETACS-ECU.
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