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NAVIGATION SYSTEM (for DVD) Vehicle Speed Signal Circuit between Navigation Receiver Assembly and Combination Meter

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DTC Code DTC Name
  Vehicle Speed Signal Circuit between Navigation Receiver Assembly and Combination Meter
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DESCRIPTION

Navigation function:

The navigation receiver assembly receives a vehicle speed signal from the combination meter and information about the GPS antenna, and then adjusts vehicle position.

ASL (Automatic Sound Levelizer) function:

The circuit is necessary for the ASL built into the navigation receiver assembly.

Speed signals are received from the combination meter and used for the ASL.

The ASL function automatically adjusts the sound data in order to enable to hear the clear audio sound even when vehicle noise increases (as vehicle noise increases, the volume is turned up etc.).

Tip:

  • 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 any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


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    INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)


    1. A017G2RE01

      Check the output waveform.


      1. Remove the combination meter assembly with the connector still connected.

      2. Connect an oscilloscope to terminals E1-9 (+S) and body ground.

      3. Ignition switch on (IG).

      4. Turn the wheel slowly.

      5. Check the signal waveform according to the condition(s) in the table below.

        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Driving at approx. 20 km/h (12 mph)
        OK
        The waveform is displayed as shown in the illustration.
        Tip:

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.


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    CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - COMBINATION METER)


    1. A017D38E02

      Disconnect navigation receiver assembly connector E4 and combination meter connector E1.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E4-3 (SPD) - E1-9 (+S) Always Below 1 Ω

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    CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - JUNCTION CONNECTOR)


    1. A017FGRE01

      Disconnect junction connector E17.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E17-3 - E4-3 (SPD) Always Below 1 Ω

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    REPLACE NAVIGATION RECEIVER ASSEMBLYClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - JUNCTION CONNECTOR)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (JUNCTION CONNECTOR)

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    GO TO METER / GAUGE SYSTEMClick here