Speed Signal Circuit (Stereo Component Amplifier Assy)

SPEED SIGNAL CIRCUIT (STEREO COMPONENT AMPLIFIER ASSY)

CIRCUIT DESCRIPTION
This circuit is necessary for the stereo component amplifier assy for the ASL (Auto Sound Leveliser). Speed signals are received from the combination meter.

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

Standard System: Speed signals and a microphone for the ASL built into the stereo component amplifier assy are used.

Mark Levinson System: Speed signals are used.

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 diagram below will not operate normally.

Wiring Diagram:

Step 1 - 2:

Step 3:

Step 4:

INSPECTION PROCEDURE