TOYOTA PARKING ASSIST-SENSOR SYSTEM(except Hatchback) 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 back sonar or clearance sonar switch assembly 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

A01T9PTE28
*1 from IG1 NO. 3 Relay
*2 ECU-IG NO. 4
*3 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 procedure.

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization may be needed. Refer to Initialization.

    Click here

PROCEDURE


  1. INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY


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

      for Wagon: Click here

      for Sedan: Click here

    2. A01TBNVC05
      *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 Condition Specified Condition
      9 (IG) - 6 (ECU) Back sonar or clearance sonar switch assembly on Below 1 Ω
      9 (IG) - 6 (ECU) Back sonar or clearance sonar switch assembly off 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY for Wagon: Click here
    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY for Sedan: Click here

    OK

  2. 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
      Tester Connection Condition Specified Condition
      E100-9 (IG) - Body ground Ignition switch ON 11 to 14 V
      E100-9 (IG) - Body ground Ignition switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the E98 clearance warning ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E98-10 (CLSW) - E100-6 (ECU) Always Below 1 Ω
      E98-10 (CLSW) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG B

    A

    REPLACE CLEARANCE WARNING ECU ASSEMBLY for Wagon LHD: Click here
    REPLACE CLEARANCE WARNING ECU ASSEMBLY for Wagon RHD: Click here
    REPLACE CLEARANCE WARNING ECU ASSEMBLY for Sedan: Click here

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR