Main problem of bm54 or logic 7 amplifier units that one or more of the output amplifier fails, resulting no sound in one or more channels. This problem can be repaired installing new amplifier kit.This can be used on any BM54, ASK or Logic 7 bass problem older revision units:

(I have instructions only for bm54 module repair)


BMW 3, 5 and 7 series, plus X3 X5 Z4 (E46, M3, E39, E38, E83, E53, E85) 
Some Rover 75 (Connoisseur SE), MG ZT
Range Rover (L322 2003 to 2005) 
 


Superior output power capability: 

- 4 x 51W/4Ω max

- 4 x 30W/4Ω @ 14.4v, 1KHz, 10%

- 4 x 80W/2Ω max

- 4 x 55W/2Ω @ 14.4v, 1KHz, 10%

- MOSFET output power stage

- Excellect 2Ω driving capability

- Hi-Fi class distortion

- Low output noise

- Automute

- Protections: output short circuit to GND, to VS, across the load, reversed battery, ESD.

Wires included.

I will send you installation instructions for bm54 via email.