Coding Resistor
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, 2007 BMW X3, and 2006 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Because of mechanical tolerances in production, the characteristic curve of the multi-disc clutch locking torque varies slightly. Once the actual locking torque has been measured on the clutch test bench, a resistor is attached to the servomotor; the resistor's value is a reference to the locking torque characteristic. Each time the engine is started, the transfer case control unit measures the resistance value once and the optimum program map for the transfer case fitted is selected. See Fig 1 .