Speed Signal Circuit (Stereo Component Amplifier Assy)

SPEED SIGNAL CIRCUIT (STEREO COMPONENT AMPLIFIER ASSY)

CIRCUIT DESCRIPTION

Mark Levinson models only:
The circuit is necessary for the stereo component amplifier assy for the ASL (Auto Sound Levelizer). Speed signals are received from the combination meter.

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

Mark Levinson System: Using speed signals

HINT:
- 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 given diagram will not operate normally.

Wiring Diagram:

Step 1-2:

Step 3:

Step 4:

INSPECTION PROCEDURE