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Home >> Saab >> 2003 >> 9-3 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (TC/Abs System Version 5.3 - Repair) >> Technical Description Control >> Brief description, TC/ABS 5.3 >> Speed information for other systems

Speed information for other systems

WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

Several other systems in the car must be aware of the vehicle speed. The TC/ABS unit places information on the wheel speed on the P-bus. This information is corrected in the main instrument unit using a factor that is dependent on the programmed tire size. The main instrument unit places the information on the vehicle speed on the I-bus.

For more information concerning bus communication, see SYSTEM OVERVIEW .

Certain systems (not Saab standard) may require a signal from the wheel sensors. TC/ABS therefore generates a square wave directly from both the sensors on the rear wheels. See also CONTROL MODULE CONNECTIONS 

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