Inspection Procedure 2: The reversing sensor indicator does not illuminate.


caution
  • Before replacing the ECU or sensor, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the illuminated licence plate is installed, the sensors may not operate because of noise from the plate. (When the ultrasonic noise is received, the bass toned buzzer sound continuously. When the ultrasonic noise stops, the normal operation will be resumed immediately.)

COMMENTS ON TROUBLE SYMPTOM


If the reversing indicator does not illuminate, the wiring harness, connectors, corner sensor/back sensor-ECU, or ETACS-ECU may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Sonar switch check


Check the indicator. (Refer to )

Q. Is the check result normal?

Go to Step 2.

Replace the sonar switch.

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 GROUP 54A - ETACS - Diagnosis Code Chart .

Go to Step 3.

STEP 3. Voltage measurement at sonar switch connector (power supply terminal)


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position.
(3)Check the voltage between the sonar switch connector (power supply terminal) and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 5.

Go to Step 4.

STEP 4. Check of short to power supply, short to earth, and open circuit in IG1 line between ETACS-ECU connector and sonar switch connector.


Q. Is the check result normal?

Troubleshoot the ETACS-ECU. Refer to GROUP 54A - ETACS - Inspection Procedure 2 "The ignition switch (IG1) signal is not received" .

Repair the connector(s) or wiring harness.

STEP 5. Check of short to power supply, short to earth, and open circuit in ING line between corner sensor/back sensor-ECU connector and sonar switch connector.


Q. Is the check result normal?

Go to Step 6.

Repair the connector(s) or wiring harness.

STEP 6. Retest the system


Q. Is the check result normal?

The diagnosis is complete.

Replace the corner sensor/back sensor-ECU.