Audio And Visual System (W/ Navigation System) Vehicle Speed Signal Circuit Between Stereo Component Amplifier And Combination Meter

Audio Visual Telematics. Land Cruiser. Urj200, 202 Grj200 Vdj200
Audio Video. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - COMBINATION METER)

INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

AUDIO AND VISUAL SYSTEM (w/ Navigation System) - Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter


DESCRIPTION

The circuit is necessary for the Automatic Sound Levelizer (ASL) built into the stereo component amplifier assembly.
Speed signals are received from the combination meter assembly and used for the ASL.
The ASL function automatically adjusts the sound volume in order to clear audio quality even when vehicle noise increases (as vehicle noise increases, the volume is turned up etc.).
HINT:
  1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective system based on the pulse signal.
  2. 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.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Audio Video.Audio And Visual System (For Radio Receiver Type).Audio And Visual System (W/ Navigation System) Vehicle Speed Signal Circuit Between Stereo Component Amplifier And Combination Meter


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - COMBINATION METER)

  1. Disconnect the F74 stereo component amplifier assembly connector and E7 combination meter assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F74-17 (SPD) - F7-4 (+S)
    		Always
    		Below 1 Ω
    F74-17 (SPD) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

  1. Reconnect the E7 combination meter assembly connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Audio Video.Audio And Visual System (For Radio Receiver Type).Audio And Visual System (W/ Navigation System) Vehicle Speed Signal Circuit Between Stereo Component Amplifier And Combination Meter

  1. Check the input waveform.

    1. Connect an oscilloscope to terminal F74-17 (SPD) and body ground.

    2. Turn the engine switch on (IG).

    3. Turn a wheel slowly.

      Text in Illustration
      *a
      		Front view of wire harness connector
      (to Stereo Component Amplifier Assembly)


      4. Land Cruiser. Urj200, 202 Grj200 Vdj200.Audio Video.Audio And Visual System (For Radio Receiver Type).Audio And Visual System (W/ Navigation System) Vehicle Speed Signal Circuit Between Stereo Component Amplifier And Combination Meter

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

      Item
      		Condition
      Measurement terminal
      		F74-17 (SPD) - Body ground
      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.
      HINT:
      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.


NG
GO TO METER / GAUGE SYSTEM (Click here)
OK

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