Can Bus

WARNING: This page is about a different car, the 2009 Land Rover Range Rover, 2008 Land Rover Range Rover, and 2007 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

The controller area network (CAN) bus is a high speed broadcast network where control modules automatically transmit information every few milliseconds. Information is broadcast down a pair of twisted wires, known as controller area network (CAN) high and controller area network (CAN) low. Information is transmitted on the controller area network (CAN) bus as a voltage difference between the 2 wires.

Two controller area network (CAN) networks are used on the vehicle; medium speed and high speed, with the instrument cluster acting as a gateway between the 2 networks.

Both the medium and high speed controller area network (CAN) bus are connected to the instrument cluster and the diagnostic socket. The medium speed controller area network (CAN) bus terminates at the integrated head unit and the immobilization control module. The high speed controller area network (CAN) bus terminates at the parking brake control module and the anti-lock brake system (ABS) control module.

Control modules are connected in a loop or spur configuration. Should a control module that is looped suffer a connector failure, the bus system will separate into 2 sub-busses. Some communication may still be possible within each sub-bus, but symptoms may be noticed by the driver.