TOYOTA PARKING ASSIST-SENSOR SYSTEM Speed Signal Circuit

DESCRIPTION

The rear clearance warning ECU assembly receives the vehicle speed signal from the combination meter assembly.

WIRING DIAGRAM

A01J4EPE05

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK COMBINATION METER ASSEMBLY (SPEEDOMETER)


    1. Drive the vehicle and check if the function of the speedometer on the combination meter is normal.

      OK
      Actual vehicle speed and the speed indicated on the speedometer are the same.

    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

  2. CHECK REAR CLEARANCE WARNING ECU ASSEMBLY


    1. A01J6TBE03

      Using an oscilloscope, check the waveform.

      Measurement Condition
      Item Content
      Tester Connection C25-3 (SPD) - Body ground
      Tool Setting 5 V/DIV., 10 msec./DIV.
      Condition Vehicle driven at approximately 20 km/h (12.4 mph)
      OK
      Correct waveform is as shown.

    NG

    CHECK HARNESS AND CONNECTOR (REAR CLEARANCE WARNING ECU ASSEMBLY - COMBINATION METER ASSEMBLY) Click here

    OK

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

  3. CHECK HARNESS AND CONNECTOR (REAR CLEARANCE WARNING ECU ASSEMBLY - COMBINATION METER ASSEMBLY)


    1. A01J5BQE76

      Disconnect the C25 rear clearance warning ECU assembly connector.

    2. A01J5WIE02

      Disconnect the C10 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C25-3 (SPD) - C10-6 Always Below 1 Ω
      C25-3 (SPD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here