TOYOTA PARKING ASSIST-SENSOR SYSTEM Clearance Sonar Main Switch Circuit

DESCRIPTION

When the back sonar or clearance sonar switch assembly turns on, the ON signal is input into the clearance warning ECU assembly.

WIRING DIAGRAM

A01X5YEE03
*a from IG1 NO.2 Relay
*b ECU-IG NO.3
*c Back Sonar or Clearance Sonar Switch Assembly
*d Clearance Warning ECU Assembly

CAUTION / NOTICE / HINT

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

PROCEDURE


  1. READ VALUE USING GTS


    1. Check the Data List for proper functioning of the back sonar or clearance sonar switch assembly Click here.

      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

      		 -
      OK
      The GTS display changes according to operation of back sonar or clearance sonar switch assembly.

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  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 - CLEARANCE WARNING ECU ASSEMBLY AND BATTERY)


    1. Disconnect the F92 back sonar or clearance sonar switch assembly connector.

    2. Disconnect the G21 clearance warning ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G21-6 (ECU) - F92-9 (CLSW) Always Below 1 Ω
      G21-7 (IND) - F92-32 (MSDL) Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G21-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Below 1 V

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR