CAN Bus Messages

WARNING: This page is about a different car, the 2013 Land Rover LR4, 2012 Land Rover LR4, 2011 Land Rover LR4, and 2010 Land Rover LR4. However, it is still accessible from the selected car via links, so may be relevant.

The CAN bus is a high speed broadcast network connected between various vehicle control modules. The CAN network carries an extensive list of messages between the different control modules enabling more sophisticated control with reduced complexity. Data on the network is packaged for efficient communication and prioritised according the urgency and importance of the Messages. The bus comprises two wires, which are twisted together to minimise electromagnetic interference (noise) produced by the CAN messages. Refer to Communications Network article.

The transfer box control module is connected on the CAN bus and controls transfer box operation using CAN messages from other control units on the network. Wheel speed, vehicle acceleration, engine torque and speed, gear information, from the automatic transmission, temperature information, car configuration, axle ratios and Terrain Response™ mode inputs, are some of the main signals received by the control module.

In the event of a CAN bus failure the following symptoms may be observed:

Shift from high to low or low to high inoperative
Instrument cluster low range warning lamp inoperative
Warning messages or lamps displayed in instrument cluster.