Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - AUDIO / VIDEO

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:
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.
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

Audio And Visual System (W/ Navigation System) - Vehicle Speed Signal Circuit Between Stereo Component Amplifier And Combination Meter. AUDIO / VIDEO. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

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

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

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    F74-17 (SPD) - F7-4 (+S)AlwaysBelow 1 Ω
    F74-17 (SPD) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
2.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

Reconnect the E7 combination meter assembly connector.

Audio And Visual System (W/ Navigation System) - Vehicle Speed Signal Circuit Between Stereo Component Amplifier And Combination Meter. AUDIO / VIDEO. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Check the input waveform.


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

Turn the engine switch on (IG).

Turn a wheel slowly.

Text in Illustration
*aFront view of wire harness connector
(to Stereo Component Amplifier Assembly)
Audio And Visual System (W/ Navigation System) - Vehicle Speed Signal Circuit Between Stereo Component Amplifier And Combination Meter. AUDIO / VIDEO. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

ItemCondition
Measurement terminalF74-17 (SPD) - Body ground
Tool setting5 V/DIV., 20 ms./DIV.
Vehicle conditionDriving 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 ()
OK
REPLACE PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
AUDIO / VIDEO
Land Cruiser URJ200 URJ202 GRJ200 VDJ200
AUDIO AND VISUAL SYSTEM w/ Navigation System