Inspection Procedure
2: The Reversing Sensor Indicator does not Illuminate.
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COMMENTS ON TROUBLE SYMPTOM
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If the reversing indicator does not illuminate, the wiring harness, connectors, corner
sensor/back sensor-ECU, or ETACS-ECU may be defective.
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- Damaged harness wires and connectors
- Malfunction of corner sensor/back sensor-ECU
- Malfunction of the ETACS-ECU
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STEP 1. Connector check: C-103 sonar switch 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. Sonar switch check
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Refer to  .
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Q.
Is the check result normal?
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Go to Step 3.
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Replace the sonar switch.
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STEP 3. M.U.T.-III other system diagnosis code
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Check if the diagnosis code is set to the ETACS-ECU.
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Q.
Is the check result normal?
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Troubleshoot the ETACS-ECU. Refer to ETACS-ECU -
Troubleshooting .
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Go to Step 4.
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STEP 4. Voltage measurement at the C-103 sonar switch connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between the C-103 sonar switch connector (terminal No. 5) and
the body earth.
OK: Battery voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Wiring harness check from C-317 ETCS-ECU connector (terminal
No.5) to C-103 sonar switch connector (terminal No. 5)
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Before the wiring harness check, check ETACS-ECU connectors C-317, and repair if necessary.
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Q.
Is the check result normal?
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Retest the system.
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Repair the wiring harness.
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STEP 6. Connector check: C-125 corner sensor/back sensor-ECU connector
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the defective connector.
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STEP 7. Wiring harness check from C-103 sonar switch connector (terminal
No. 6) to C-125 corner sensor/back sensor-ECU connector (terminal No. 12).
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Q.
Is the check result normal?
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Go to Step 8.
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Repair the wiring harness.
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STEP 8. Retest the system
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Q.
Is the check result normal?
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The diagnosis is complete.
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Replace the corner sensor/back sensor-ECU.
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