9-3 SE Convertible (9400) L4-2.0L Turbo (B205) HO (2001)
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Steering Wheel Controls
Steering wheel controls
The steering wheel controls consist of 3 units (7 switches) mounted in the steering wheel and airbag module. The steering wheel controls give the SID
unit information on which contacts are activated.
The SID unit supplies the steering wheel controls with +5 V via pin 18 and grounds them through pin 3.
The 7 steering wheel switches consist of 7 resistors connected in series. When a button is pressed, the switch concerned is grounded, see table below.
Depending on which button is pressed, the aggregate resistance in the circuit varies and with it the voltage detected by the SID unit.
