Inspection Procedure 1: The Reversing Sensor System does not Operate.

COMMENTS ON TROUBLE SYMPTOM

If the Reversing sensor system does not work at all even when the ignition switch is turned "ON", the power supply system, corner sensor/back sensor-ECU or ETACS-ECU may have a problem.

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?

	Go to Step 2.

	Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

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?

	Troubleshoot the ETACS-ECU. Refer to ETACS-ECU - Troubleshooting .

	Go to Step 3.

STEP 3. Connector check: C-125 corner sensor/back sensor-ECU connector

Q. Is the check result normal?

	Go to Step 4.

	Repair the defective connector.

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: Battery voltage

Q. Is the check result normal?

	Go to Step 7.

	Go to Step 5.

STEP 5. Connector check: C-317 ETACS-ECU connector

Q. Is the check result normal?

	Go to Step 6.

	Repair the defective connector.

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?

	Retest the system.

	Repair the wiring harness.

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?

	Go to Step 9.

	Go to Step 8.

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?

	Retest the system.

	Repair the wiring harness.

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?

	Replace the corner sensor/back sensor.

	Replace the ETCS-ECU.