9-5 Aero (9600) L4-2.3L Turbo (B235) HO (2000)
The audio system can also be controlled with the steering wheel switches (the control buttons are located on the steering wheel).
The switches comprise two units (six connectors). Detailed information is given in the Owner's Manual.
The steering wheel switches are connected to SID and present information on the connectors that are active. SID sends information on the buttons to the
bus which is then read by the main unit.
Function
SID supplies +5 V to the steering wheel switches via pin 22, and grounds them via pin 9.
The six connectors comprise six resistors connected in series. When a button is pressed, the connector in question is grounded (see the table).
When a connector is pressed, the total resistance in the circuit changes, as does the voltage value which SID then reads.
Diagnostics
It there is an open or short circuit to B+ or short circuit to ground for more than 5 minutes, the SID will generate diagnostic trouble code B2371.
Speed-Dependent Volume
Speed-dependent volume
Speed-dependent Volume
General
Automatic volume control is controlled by the car's speed to compensate for background noise that occurs when the car is moving.
The function is active at speeds over 60 kph.
Function
The main instrument unit (MIU) receives a speed signal from the ABS MIU sends the information out on the bus where it can be read by the main unit