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 lower instrument panel finish panel sub-assembly.

When the back sonar or clearance sonar switch assembly 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

B002CAYE03
for LHD
*a from LH-IG1 RLY1 Relay
*b Back Sonar or Clearance Sonar Switch Assembly
*c Clearance Warning ECU Assembly
B002CAYE06
for RHD
*a from RH-IG1 RLY1 Relay
*b Back Sonar or Clearance Sonar Switch Assembly
*c Clearance Warning ECU Assembly

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 engine 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.


      Body Electrical > Clearance Sonar > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Clearance Sonar ECU Clearance warning ECU assembly information Normal or Abnormal

      Normal: Clearance warning ECU assembly normal

      Abnormal: Clearance warning ECU assembly not normal

      		 -

      Body Electrical > Clearance Sonar > Data List
      Tester Display
      Clearance Sonar ECU
      Result
      Result Proceed to
      "Normal" is displayed. A
      "Abnormal" is displayed. B

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    A

  2. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine 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.


      Body Electrical > Clearance Sonar > Data List
      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

      		 -

      Body Electrical > Clearance Sonar > Data List
      Tester Display
      Main Switch
      Result
      Result Proceed to
      The display does not change as shown above when the back sonar or clearance sonar switch assembly is operated. A
      The display changes as shown above when the back sonar or clearance sonar switch assembly is operated. B

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    A

  3. INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY


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

      Click here

    2. B002EO6C02
      *a

      Component without harness connected

      (Back Sonar Clearance Sonar Switch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K48-4 (IG) - K48-5 (ECU) Back sonar or clearance sonar switch assembly pushed Below 1Ω
      K48-4 (IG) - K48-5 (ECU) Back sonar or clearance sonar switch assembly not pushed 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY Click here

    OK

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


    1. B002EO6C04
      *a

      Component without harness connected

      (Back Sonar Clearance Sonar Switch Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K48-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      K48-4 (IG) - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K9-38 (CLSW) - K48-5 (ECU) Always Below 1 Ω
      K9-38 (CLSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR