TOYOTA 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 Toyota parking assist-sensor system operates according to this signal.

WIRING DIAGRAM

A01EWU5E11

INSPECTION PROCEDURE

Note

Inspect the fuse 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 ignition switch to ON.

    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

    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. A01EVI7E09
      Text in Illustration
      *a

      Component without harness connected

      (Back Sonar or Clearance Sonar Switch Assembly)

      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 on Below 1 Ω
      9 (IG) - 6 (ECU) Clearance sonar main switch off 10 kΩ or higher

    NG

    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY POWER SOURCE)


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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      I5-9 (IG) - Body ground Ignition switch ON 11 to 14 V
      I5-9 (IG) - Body ground Ignition switch off Below 1 V
      for RHD
      Tester Connection Condition Specified Condition
      I6-9 (IG) - Body ground Ignition switch ON 11 to 14 V
      I6-9 (IG) - Body ground Ignition switch off Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the I82 connector from the clearance warning ECU assembly.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      I82-9 (CLSW) - I5-6 (ECU) Always Below 1 Ω
      I82-9 (CLSW) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      I82-9 (CLSW) - I6-6 (ECU) Always Below 1 Ω
      I82-9 (CLSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here