TOYOTA PARKING ASSIST-SENSOR SYSTEM Reverse Signal Circuit

DESCRIPTION

The clearance warning ECU assembly receives the reverse signal from the power management control ECU via the No. 1 integration relay.

WIRING DIAGRAM

A003TBOE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT CLEARANCE WARNING ECU ASSEMBLY


    1. Disconnect the E104 clearance warning ECU assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E104-8 (RL) - Body ground

      Power switch on (READY)

      Reverse (R) selected

      		 11 to 14 V
      E104-8 (RL) - Body ground

      Power switch on (READY)

      Reverse (R) not selected

      		 Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 INTEGRATION RELAY) Click here

    OK

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

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 INTEGRATION RELAY)


    1. Disconnect the E104 clearance warning ECU assembly connector.

    2. Disconnect the 1G No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E104-8 (RL) - 1G-4 (NAV) Always Below 1 Ω
      E104-8 (RL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT NO. 1 INTEGRATION RELAY


    1. Disconnect the 1G No. 1 integration relay connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1G-13 (BKUP) - Body ground

      Power switch on (READY)

      Reverse (R) selected

      		 11 to 14 V
      1G-13 (BKUP) - Body ground

      Power switch on (READY)

      Reverse (R) not selected

      		 Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - POWER MANAGEMENT CONTROL ECU) Click here

    OK

    REPLACE NO. 1 INTEGRATION RELAY Click here

  4. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the 1G No. 1 integration relay connector.

    2. Disconnect the A98 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1G-13 (BKUP) - A98-15 (BL) Always Below 1 Ω
      1G-13 (BKUP) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here