Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - AUDIO / VIDEO

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

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

AUDIO AND VISUAL SYSTEM (w/o 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:

WIRING DIAGRAM

INSPECTION PROCEDURE

Check the output waveform.

Remove the combination meter assembly with the connector still connected.

Connect an oscilloscope to terminal E7-4 (+S) and body ground.

Turn the engine switch on (IG).

Turn the wheel slowly.

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

Item	Condition
Measurement terminal	E7-4 (+S) - 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.

Text in Illustration

*1	Component with harness connected (Combination Meter Assembly)