Audio System - Whistling Noise on AM Band

SI B 65 21 07
Audio, navigation, Monitors, Alarms, SRS

January 2008
Technical Service

SUBJECT:
Whistling Noise From the Radio in AM Mode Only

MODEL:
E93 (3 Series Convertible)

Vehicles produced to 09/27/2007

SITUATION

In AM mode only, there is a repetitive whistling noise from the radio every 20 seconds. This affects radio stations in the frequency range 770 kHz to 800 kHz.

This whistling noise sounds like a capacitor charging and discharging, and occurs with the hard top up or down.

Note:
The whistling noise does not occur with the ignition off (KL-30).

CAUSE

The affected Roll-Over Protection Module (P/N 65 77 9 134 734, HW:9 and SW:19) works in the same frequency range (770 - 800 kHz).

CORRECTION

Replace the Roll-Over Protection Module.

Install an improved part with HW: 10 and SW: 20.





Parts Information





Warranty Information

Covered under the terms of the BMW New Vehicle Limited Warranty.

Please refer to the latest KSD for all applicable labor operations and allowances.

If the appropriate labor operation is not contained in KSD, then a work time labor operation should be used.





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