  The sixth Generation AUDI A6 Q7 usually have problems like that: when turn on the key, the cluster not light up, electric steering lock not unlock, car not start etc. It’s a common problem, most of time it can be repaired by the following method. dismantle the J518 Module from the car, open it carefully
First change the relay, Micro switch, ELV motor, if not solved the problem, then read the data(flash data & eeprom data) from the old MCU then write the data in to new MCU, then solder the MCU back to the circuit board well, below items you may need to repair or test it on bench.
