Are the , or is the module completely unresponsive ?

: Use a tool like XPROG-M or VVDI Prog to read the D-Flash.

The in BMWs (specifically E-series models like the E90, E70, E84) is prone to "bricking" or entering a protected mode after a battery failure, jump-start, or coding error. This guide covers how to identify and reset it. Identifying a Faulty FRM When the FRM module fails or locks, you will notice: Windows will not roll up or down. Interior lights and dash lights stay on or won't work.

: Never let your battery get extremely low.

: Disconnect the battery, remove the plastic trim near the hood release, and unplug the module.