Inspection Procedure 1: The Reversing Sensor System does not Operate.
COMMENTS ON TROUBLE SYMPTOM
PROBABLE CAUSES
- Malfunction of corner sensor/back sensor-ECU
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE |
STEP 1. M.U.T.-III CAN bus diagnostics |
| Use the M.U.T.-III to diagnose the CAN bus lines. |
Q.
Is the check result normal?
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 Go to Step 2. |
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 Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting  ). |
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STEP 2. M.U.T.-III other system diagnosis code |
| Check if the diagnosis code is set to the ETACS-ECU. |
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 3. |
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STEP 3. Connector check: C-125 corner sensor/back sensor-ECU connector |
Q.
Is the check result normal?
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| Go to Step 4. |
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| Repair the defective connector. |
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STEP 4. Voltage measurement at the C-125 corner sensor/back sensor-ECU connector |
| (1)Disconnect the connector, and measure at the wiring harness side. |
| (2)Turn the ignition switch to the "ON" position. |
| (3)Measure the voltage between the C-125 corner sensor/back sensor-ECU connector (terminal No. 11) and the body earth. OK: System voltage |
Q.
Is the check result normal?
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| Go to Step 7. |
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| Go to Step 5. |
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STEP 5. Connector check: C-317 ETACS-ECU connector |
Q.
Is the check result normal?
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| Go to Step 6. |
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| Repair the defective connector. |
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STEP 6. Wiring harness check between the C-317 ETACS-ECU connector (terminal No. 5) and the C-125 corner sensor/back sensor-ECU connector (terminal No. 11) |
Q.
Is the check result normal?
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| Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "The ignition switch (IG1) signal is not received" . |
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| Repair the wiring harness. |
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STEP 7. Resistance measurement at the C-125 corner sensor/back sensor-ECU connector |
| (1)Disconnect the connector, and measure at the wiring harness side. |
| (2)Measure the resistance between the C-125 corner sensor/back sensor-ECU connector (terminal No. 20) and the body earth. OK: Continuity exists (2 Ω or less) |
Q.
Is the check result normal?
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| Go to Step 9. |
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| Go to Step 8. |
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STEP 8. Wiring harness check between the C-125 corner sensor/back sensor-ECU connector (terminal No. 20) and the body earth |
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 9. Replace the corner sensor/back sensor-ECU temporarily, and then check the trouble symptom. |
| Replace the corner sensor/back sensor-ECU temporarily, then check if the corner sensors operate. |
Q.
Is the check result normal?
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| Replace the corner sensor/back sensor. |
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| Replace the ETACS-ECU. |
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