The Audi A2 has three buses with different data rates. The used instrument cluster serves as a gateway. If one of the two wires fails, the convenience CAN bus continues to operate, but already in emergency mode. The corresponding error is stored in the fault memory. When the ignition is switched on, the E87 control and display panel starts to work using the temperature, air distribution and supply fan speed settings that were in effect when the ignition was last turned off with the same key. The key is recognized by reading the fixed transponder code. Used and indication E87 receives this information via the CAN bus from the immobilizer control unit. Used comfort systems connected by busbars to other units. With what specifically - depends on the configuration of the a / m.
- J104 - Used ABS with EDS
- J217 - Used automatic transmission
- J285 - Used with display in instrument cluster
- J537 - Used 4LV (engine)
- E87 - Air conditioning display and control unit
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