TOYOTA PARKING ASSIST-SENSOR SYSTEM Clearance Sonar Main Switch Circuit

DESCRIPTION

When the clearance sonar main switch turns on, the on signal is input into the ECU.

WIRING DIAGRAM

A01BAAEE01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK CLEARANCE WARNING ECU


    1. A01BE94E04

      Disconnect the H54 clearance warning ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H54-1 (IG) - H54-22 (E) Ignition switch ON, clearance sonar main switch on 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - BODY GROUND) Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - BODY GROUND)


    1. A01BE94E05

      Disconnect the H54 clearance warning ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H54-22 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE SONAR MAIN SWITCH - BATTERY)


    1. A01BFY6E01

      Disconnect the H15 front passenger seat belt warning light assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H15-7 (BD) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FRONT PASSENGER SEAT BELT WARNING LIGHT ASSEMBLY (CLEARANCE WARNING MAIN SWITCH)


    1. A01BE8DE01

      Remove the front passenger seat belt warning light assembly Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      7 (BD) - 12 (SK) Ignition switch ON, clearance sonar main switch off Below 1 Ω
      7 (BD) - 12 (SK) Ignition switch ON, clearance sonar main switch on 10 kΩ or higher

    NG

    REPLACE FRONT PASSENGER SEAT BELT WARNING LIGHT ASSEMBLY Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CLEARANCE WARNING ECU - FRONT PASSENGER SEAT BELT WARNING LIGHT ASSEMBLY)