Remote Control: Description and Operation

Steering Wheel Controls:

The audio system can also be operated with the steering wheel controls (control buttons on the steering wheel). The steering wheel controls consist of 2 units (6 buttons). Detailed instructions on their use is given in the Owner's Manual.
The steering wheel controls are connected to the SID unit and provide information on which switches are activated. The SID unit then sends the current button information to the bus, which is read by the main unit.

Function
The SID unit supplies the steering wheel controls with +5 V via pin 3 and grounds through pin 18.
The 6 switches on the steering wheel consist of 6 resistors connected in series. When a button is pressed, the switch concerned is grounded, so the table.
Depending on which button is pressed, the aggregate resistance in the circuit varies and with it the voltage detected by the SID unit.

Diagnostics
On open-circuit/short to B+ and short-circuit to ground for more than 5 minutes, the SID generates diagnostic trouble code B2371.







Tolerance 5%
The steering wheel controls described above only apply to cars equipped with Saab Audio System. Only the horn is included on the steering wheel controls on cars not equipped with Saab Audio System.