TOYOTA PARKING ASSIST-SENSOR SYSTEM Vehicle Speed Signal Circuit

WIRING DIAGRAM

A01BBJ4E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL)


    1. A01BEK2E01

      Disconnect the H54 clearance warning ECU connector.

    2. Using an oscilloscope, check the signal waveform of the meter.

      Measurement Condition
      Item Content
      Tester Connection H54-5 (SPD) - Body ground
      Tool Setting 5 V/DIV., 20 msec./DIV.
      Vehicle Condition Drive vehicle at 20 km/h (12 mph)
      OK
      Waveform is as shown in illustration.

      Tech Tips

      As the vehicle speed increases, the wavelength shortens.


    NG

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

    OK

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

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - COMBINATION METER)


    1. A01BA62E01

      Disconnect the H54 clearance warning ECU connector.

    2. Disconnect the H20 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H54-5 (SPD) - H20-9 (+S) Always Below 1 Ω
      H54-5 (SPD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    GO TO METER / GAUGE SYSTEM Click here