U codes are reserved for future systems and may be proprietary to the
The CAN Bus allows 12 Volts, or other potential, power to be
distributed around the vehicle (or system) on a single power rail with
local actuators connecting the power to each application as needed.
Vehicle functions such as temperatures , alarms or the positions of
switches are monitored by sensors connected to the bus and the
controller can direct the actuators to initiate the appropriate response
Two variants are available to suit different
transmission rates. A high speed (1 MBaud) bus is used for rapid control
devices for operations such as engine management and vehicle stability
and motion control. For simple switching and control of functions such
as lighting, windows, mirror adjustment and instrument displays a low
speed (100 KBaud) bus is used.
The CAN bus was designed to provide secure
communications in the very harsh operating environments with high levels
of electrical noise which are found in automotive systems.
The communications protocol defines the following:
- Method of addressing the devices connected to the bus
- Data word format (The message)
- Priority setting
- Transmission sequence
- Control signals
- Error detection
- Error handling or correction
- Transmission speed
The message data, the control signals and the
error correction are contained in a data frames of equal length which
are transmitted sequentially over the transmission channel.
Definitively, you need visit the dealer to know excalty is you have any problem with the software in your modules os any loss harnesses or wires there.
Additional details, onyl with the manufactured.
Hope this helps.