This what the Service Measure states......

Service Measure B65-209-04 - updated on 4/30/04

Subject: E39, E46, E53 with BM53 Radio Navigation system, and DSP or Harman/Kardon Amplifier: Radio is switching from Stereo to Mono

Complaint: In FM mode only the radio sound is switching from Stereo to Mono, fading in and out.

Cause: Software error in the BM53 Radio.

Measure: On a customer complaint basis only, replace the BM53 radio. Install a BM53 radio with the new software, P/N: 65-12-4-135-562

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