LEXUS PARKING ASSIST-SENSOR SYSTEM Clearance Sonar Main Switch Circuit

DESCRIPTION

The back sonar or clearance sonar switch assembly is installed at the base of the driver side of the instrument panel.

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

WIRING DIAGRAM

A01FR4VE05

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / 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

      		 -
      Clearance Sonar ECU Type Type of clearance warning 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

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    C

    INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY Click here

    A

    PROCEED TO NEXT SUSPECTED AREA 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.


    NG

    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY - BATTERY)


    1. A01FUG2E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Back Sonar or Clearance Sonar Switch Assembly)

      Disconnect the back sonar or clearance sonar switch assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N57-4 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the N10 clearance warning ECU assembly connector.

    2. Disconnect the N57 back sonar or clearance sonar switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N10-38 (CLSW) - N57-5 (ECU) Always Below 1 Ω
      N10-38 (CLSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here