Terminating resistor
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
To prevent electrical reflections and interference in the Controller area network (CAN) there are terminating resistors which bridge CAN H and CAN L. One in each end point on both the high and low speed side of the network. Each terminating resistor has a resistance of 120 ohm.
- The terminating resistor for the high speed Controller area network (CAN) is positioned in the brake control module/ABS control module and in the engine control module (ECM) or electronic throttle module. The terminating resistor is in the engine control module, on models without an electronic throttle module
- There are terminating resistors for the low speed Controller area network (CAN) in the upper electronic module and the rear electronic module.
Both the terminating resistors create a parallel circuit The following resistors can be measured under specified conditions:
- When the Controller area network (CAN) is intact the resistance in the network is approximately 60 ohm
- In the event of an open-circuit in the wiring, the resistance in the network is approximately 120 ohm
- In the event of a short-circuit between the communication cables the resistance is approximately 0 ohm.