Controller Area Network (Can) Bus

The CAN bus is a high speed broadcast network connected between various vehicle ECUs.

The CAN allows the fast exchange of data between ECU's every few microseconds. The bus comprises two wires which are identified as CAN High (H) and CAN Low (L). The two wires are colored Yellow/Black (H) and Yellow/Brown (L) and are twisted together to minimize electromagnetic interference (noise) produced by the CAN messages.

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 pack low range warning lamp inoperative.
• Instrument pack transfer box messages in message center inoperative.