LEXUS PARKING ASSIST-SENSOR SYSTEM Clearance Sonar Main Switch Circuit

DESCRIPTION

When the clearance sonar main switch is turned on, an ON signal is sent to the clearance warning ECU. The LEXUS parking assist-sensor system operates according to this signal.

WIRING DIAGRAM

B001MWHE56
*1 from IG1 NO. 1 Relay
*2 ECU-IG NO. 2
*3 Clearance Sonar Main Switch (Back Sonar or Clearance Sonar Switch Assembly)
*4 Clearance Warning ECU Assembly

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. According to the display on the intelligent tester, read the Data List.

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

      OFF: Clearance sonar main switch off

      ON: Clearance sonar main switch on

      		 -
      Clearance Sonar ECU Type Type of clearance sonar ECU/Normal Normal: Normal clearance sonar type -
      Result
      Result Proceed to

      Both of the following conditions are met:


      • The display changes as shown above when the clearance sonar main switch is operated.


      • "Normal" is displayed.

      		 A
      "Normal" is not displayed. B

      Both of the following conditions are met:


      • The display does not change as shown above when the clearance sonar main switch is operated.


      • "Normal" is displayed.

      		 C

    A

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

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    C

  2. INSPECT CLEARANCE SONAR MAIN SWITCH


    1. Remove the clearance sonar main switch Click here.

    2. B001N4ME06
      Text in Illustration
      *a

      Component without harness connected

      (Clearance Sonar Main Switch)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      9 (IG) - 6 (ECU) Clearance sonar main switch is pushed Below 1 Ω
      9 (IG) - 6 (ECU) Clearance sonar main switch is not pushed 10 kΩ or higher

    NG

    REPLACE CLEARANCE SONAR MAIN SWITCH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE SONAR MAIN SWITCH POWER SOURCE)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H39-9 (IG) - Body ground Power switch on (IG) 11 to 14 V
      H39-9 (IG) - Body ground Power switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (CLEARANCE SONAR MAIN SWITCH - CLEARANCE WARNING ECU ASSEMBLY)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A78-38 (CLSW) - H39-6 (ECU) Always Below 1 Ω
      A78-38 (CLSW) - Body ground Always 10 kΩ or higher

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR