NAVIGATION SYSTEM Vehicle Speed Signal Circuit between Multi-display and Combination Meter

DESCRIPTION

The multi-display performs switch operation control during driving by receiving a vehicle speed signal from the combination meter.

Tech Tips


  • A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.

  • If a short occurs in an ECU, all systems in the diagram below will not operate normally.

WIRING DIAGRAM

A015ZA8E02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK OPERATION OF SPEEDOMETER


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

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

      Tech Tips

      The vehicle speed sensor is functioning normally when the indication on the speedometer is normal.


    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

  2. INSPECT MULTI-DISPLAY


    1. A0161DPE04

      Disconnect the multi-display connector.

    2. Measure voltage.


      1. Jack up either one of the drive wheels.

      2. Move the shift lever to N.

      3. Turn the engine switch on (IG).

      4. Measure the voltage between terminal SPD of the multi-display and body ground when the drive wheels are turned slowly.

        A015YK8E01
        OK
        Voltage pulses as shown in the illustration.

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY) Click here

    OK

    REPLACE MULTI-DISPLAY Click here

  3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - MULTI-DISPLAY)


    1. A0161DPE04

      Disconnect the multi-display connector and combination meter connector.

    2. A0161Y3E02

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J50-14 (SPD) - J34-5 (+S) Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (BODY GROUND - MULTI-DISPLAY)


    1. A0161DPE04

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J50-14 (SPD) - Body ground Always 10 kΩ or higher

      Tech Tips

      If the resistance between terminal SPD and body ground is less than 10 kΩ, there may be a short in a wire harness, connector, or an ECU that is connected to the SPD signal wire.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

    OK

    REPLACE COMBINATION METER Click here