TOYOTA PARKING ASSIST-SENSOR SYSTEM Clearance Sonar Main Switch Circuit

DESCRIPTION

When the back sonar or clearance sonar switch assembly is turned on, an ON signal is sent to the clearance warning ECU, and the TOYOTA parking assist-sensor system starts operating.

WIRING DIAGRAM

A01J3ABE04

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (ECU-IG&GAUGE)


    1. Remove the ECU-IG&GAUGE fuse from the driver side junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ECU-IG & GAUGE fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY


    1. A01J3TVE04

      Remove the back sonar or clearance sonar switch assembly.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      3 (IG) - 4 (ECU) Clearance sonar main switch on Below 1 Ω
      3 (IG) - 4 (ECU) Clearance sonar main switch off 10 kΩ or higher

    NG

    REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY

    OK

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


    1. A01J6SUE04

      Disconnect the B4 back sonar or clearance sonar switch assembly connector.

    2. A01J5BQE78

      Disconnect the C25 rear 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
      B4-3 (IG) - Body ground Ignition switch ON 11 to 14 V
      B4-3 (IG) - Body ground Ignition 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
      B4-4 (ECU) - C25-10 (IG) Always Below 1 Ω
      B4-4 (ECU) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR CLEARANCE WARNING ECU ASSEMBLY - BODY GROUND)


    1. A01J5BQE79

      Disconnect the C25 rear 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
      C25-21 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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