Pt-Can, F-Can
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
In order to prevent signal reflection, 2 CAN bus users (at the extremities of the powertrain CAN network) with 120 ohm each are terminated. The two terminal resistors are connected in parallel and form an equivalent resistance of 60 ohm. When the supply voltage is switched off, this equivalent resistance can be measured between the data lines. In addition, the individual resistors can be tested independently of one another.
Information on the measurement with 60 ohm: Disconnect an easily accessible control unit from the bus. Then measure the resistance on the connector between the CAN Low and CAN High lines.
NOTE:
Not all vehicles have a terminating resistor on the CAN bus. Use the wiring diagram to check whether the connected vehicle has a terminating resistor.