AUDIO UNIT CONSTRUCTION/OPERATION

B3E092066900T03

• The audio unit is composed of the base unit, upper module, and lower module.

1
Base unit
2
Upper module (CD player or CD changer)
3
Lower module (cassette deck or MD player)
4
Cover (without upper module)

• Upper and lower module availability depends on vehicle grade.

Terminal Layout and Signal

• (See CENTER PANEL MODULE CONSTRUCTION.)

Base Unit

• The base unit controls the AM/FM tuner and upper/lower modules.

1
Base unit

Auto Level Control (ALC) Function (Standard Specification Vehicle)

Function

• Adjusts the audio volume so that the sound is balanced against wind and road noise while driving.

Operation

• The audio unit changes the volume automatically based on the vehicle speed signal sent from the DSC HU/CM.

1
Higher vehicle speed
2
Lower vehicle speed
3
Audio unit (base unit)
4
Vehicle speed signal
5
ALC circuit
6
Power amplifier
7
Speaker
8
Higher volume
9
Normal volume

• The ALC function is divided into four modes that can be used effectively to match the driving conditions.

Mode

Condition

ALC function cancelled

Outside road noise low

Outside road noise slightly high

Outside road noise high