Inspection Procedure 1: The reversing sensor system does not operate.


caution
  • Before replacing the ECU or sensor, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)
  • 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



PROBABLE CAUSES



  • Malfunction of corner sensor/back sensor-ECU
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Voltage measurement at corner sensor/back sensor-ECU connector (IG 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 corner sensor/back sensor-ECU connector (IG terminal) and body earth.
OK: System voltage

Q. Is the check result normal?





STEP 2. Check of short to power supply, short to earth, and open circuit in IG line between ETACS-ECU connector and corner sensor/back sensor-ECU connector.


Q. Is the check result normal?





STEP 3. Resistance measurement at corner sensor/back sensor-ECU connector (PGND terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the corner sensor/back sensor-ECU connector (PGND terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 4. Check of open circuit in PGND line between corner sensor/back sensor-ECU connector and body earth.


Q. Is the check result normal?





STEP 5. Replace the corner sensor/back sensor-ECU temporarily, and then check the trouble symptom.



Q. Is the check result normal?