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 parking assist ECU*1 or clearance warning ECU assembly*2.


WIRING DIAGRAM

A01X0VRE03
w/ Side Monitor System
*1 from ECU-IG No. 1 Fuse
*2 Back Sonar or Clearance Sonar Switch Assembly
*3 Parking Assist ECU
A01X0VRE04
w/o Side Monitor System
*1 from ECU-IG No. 1 Fuse
*2 Back Sonar or Clearance Sonar Switch Assembly
*3 Clearance Warning ECU Assembly

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY)


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

      Clearance Sonar
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Main Switch Back sonar or clearance sonar switch assembly / ON or OFF

      OFF: Back sonar or clearance sonar switch assembly off

      ON: Back sonar or clearance sonar switch assembly on

      		 -
      OK
      The intelligent tester 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.

      Result
      Result Proceed to
      OK (w/ Side Monitor System) A
      OK (w/o Side Monitor System) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY - CLEARANCE WARNING ECU ASSEMBLY AND BATTERY) Click here

    C

    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY Click here

    A

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


    1. Disconnect the G15 back sonar or clearance sonar switch assembly connector.

    2. Disconnect the F76 parking assist ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G15-6 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G15-9 (ECU) - F76-25 (CSSW) Always Below 1 Ω
      G15-9 (ECU) - Body ground Always 10 kΩ or higher

    OK

    REPLACE PARKING ASSIST ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the G15 back sonar or clearance sonar switch assembly connector.

    2. Disconnect the F12 clearance warning ECU assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G15-6 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G15-9 (ECU) - F12-12 (CSSW) Always Below 1 Ω
      G15-9 (ECU) - Body ground Always 10 kΩ or higher

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR