TOYOTA PARKING ASSIST-SENSOR SYSTEM(w/ Multi-display) Main Switch Circuit

DESCRIPTION

When the back sonar or clearance sonar switch assembly is turned on, the ON signal is input into the ECU.

WIRING DIAGRAM

B001IEDE04

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the Ignition switch ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body / Clearance Sonar / Data List.

    5. According to the display on the GTS, read the Data List.

      Clearance Sonar
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Main Switch Back sonar or clearance sonar switch assembly / OFF or ON

      OFF: Back sonar or clearance sonar switch assembly off

      ON: Back sonar or clearance sonar switch assembly on

      		 -
      OK
      The display changes as shown above when the TOYOTA parking assist-sensor system is operated.

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY


    1. Remove the back sonar or clearance sonar switch assembly Click here.

    2. Inspect the back sonar or clearance sonar switch assembly Click here.


    NG

    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY - CLEARANCE WARNING ECU, BATTERY AND BODY GROUND)


    1. Disconnect the G198 back sonar or clearance sonar switch assembly connector.

    2. Disconnect the I9*1 or G228*2 clearance warning ECU connector.


      • *1: for 4 Sensor Type

      • *2: for 8 Sensor Type

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G198-5 (IG) - Body ground Ignition switch ON 11 to 14 V

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for 4 Sensor Type
      Tester Connection Condition Specified Condition
      G198-2 (ECU) - I9-9 (CLSW) Always Below 1 Ω
      G198-4 (IND) - Body ground Always Below 1 Ω
      G198-2 (ECU) - Body ground Always 10 kΩ or higher
      Standard Resistance
      for 8 Sensor Type
      Tester Connection Condition Specified Condition
      G198-2 (ECU) - G228-9 (CLSW) Always Below 1 Ω
      G198-4 (IND) - Body ground Always Below 1 Ω
      G198-2 (ECU) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE CLEARANCE WARNING ECU Click here

    B

    REPLACE CLEARANCE WARNING ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR