LEXUS PARKING ASSIST-SENSOR SYSTEM Clearance Sonar Main Switch Circuit

DESCRIPTION

When the Back sonar or clearance sonar switch assembly turns on, the ON signal is input into the parking assist ECU*1 or clearance warning ECU assembly*2.


WIRING DIAGRAM

A01EOBIE03
A01EOBIE04

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY)


    1. Check the Data List for proper functioning of the back sonar or clearance sonar switch assembly Click here.

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

      OFF: Back sonar or clearance sonar switch assembly off

      ON: Back sonar or clearance sonar switch assembly on

      		 -
      OK
      The intelligent tester display changes according to operation of back sonar or clearance sonar switch assembly.

    NG

    INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  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.

      Result
      Result Proceed to
      OK (w/ Side Monitor System) A
      OK (w/o Side Monitor System) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH - CLEARANCE WARNING ECU AND BATTERY) Click here

    C

    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY Click here

    A

  3. CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH - PARKING ASSIST ECU AND BATTERY)


    1. Disconnect the E97 back sonar or clearance sonar switch assembly connector.

    2. Disconnect the F75 parking assist ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E97-6 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      E97-6 (IG) - Body ground Engine switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E97-5 (ECU) - F75-25 (CSSW) Always Below 1 Ω
      E97-5 (ECU) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE PARKING ASSIST ECU Click here

  4. CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH - CLEARANCE WARNING ECU AND BATTERY)


    1. Disconnect the E97 back sonar or clearance sonar switch assembly connector.

    2. Disconnect the F12 clearance warning ECU assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E97-6 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      E97-6 (IG) - Body ground Engine switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E97-5 (ECU) - F12-12 (CSSW) Always Below 1 Ω
      E97-5 (ECU) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here