![]() ![]() The CAN has 2 wires only, a twisted pair these carry the CAN H for high, and the CAN L for low, should a fault occur in one of these lines, the CAN will still work on the other one, but slower.Ī digital communication link between multiple Electronic Control Modules (ECM)Ī 2 wire, bi-directional communication link with data transmittedĬAN C - Engine CAN (also known as chassis CAN)įast communication speeds 125 kbps or 500 kbpsĬAN B - Interior CAN (also known as body CAN) The CAN is a high speed data bus for communication for the electrical components in the engine and body, it is also used for fault finding as any faults are logged and stored to make fault finding easier. The instrument cluster has its own Robert Bosch CAN and not included here. ![]() We are only dealing with CAN B as this is where all of the problems usually are. This is not an explanation of how the CAN and WAKE UP work, it is a guide to a simple way to know if your car is going to sleep, and how you can check with just 2 voltage checks. This is a guide to the CAN bus in the 230 it applies to all models right up to 2008ish. ![]()
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