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Read and comply with notes on protection against electrostatic damage (ESD protection).

Necessary preliminary tasks:

Disconnect battery negative lead

Remove operator unit for heater/air conditioner (with CCC/ASK) Remove centre console switch cluster (with CCC/ASK)


Comply with notes and instructions on handling optical waveguides.

Removing and installing (replacing) audio system controller BMW 3 E90

Release screws (1).

Pull back audio system controller (2) slightly.

Unlock associated plug connections and disconnect.

Remove audio system controller (2).


Carry out programming/coding.