Ah EPB issues. Bloody D3 chassis.
If you have EEPROM error unfortunately that will always bring the light on. It is software corruption most of the time. If you can get a dealer to update it, but the handbrake modules used are pretty cheap so I would advise replacement. Under the battery.
Implausible signal I would always check continuity between the affected caliper and the handbrake ecu. 5 wires from memory. Wheel off, caliper wiring loom off and handbrake ecu off. Set your multimeter to beep if there is a loop and simply pinout each one to check they are connected.
Most often than not the pins get moisture inside and corrode. Sometimes as simple as electrical cleaner sorts it, otherwise pins can be got and repaired from TPS.
If it isn't that sadly the motor.....
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