The situation to avoid

It is very important to note the following situation for VAG RH850/V850 dashboards:

Please do not turn any VAG Dashboard ON while it is still disassembled, and most important, while the fan is not ON. Only turn the dashboard ON when it is fully assembled. Otherwise, the dashboard will set a DTC "Control Module Faulty" and there is no way to fix it.

Important notes

• This is the one irreversible mistake in the section. A dashboard powered up disassembled, or with the fan off, is finished - the fault code cannot be cleared.
• It is very important to keep all the cables and wires in their original state and not put any extensions to any of the wires when soldering.
• Reading such an MCU is a very difficult task that involves some risks for the unit. In some cases the reading might not completely finish.
• If a read does not complete, treat it as a safety matter and contact the Abrites Support Team rather than retrying blindly.