Audio System - Static Noise From Speakers
Service MeasureSound Systems, Cruise, Alarms, Monitors
B65 205 03
1/23/2004
This Service Measure supersedes SM 65 205 03 dated December 2003.
Changes to this revision are identified by an asterisk.
Subject
E60: Static noise heard from all speakers in all audio modes.
Complaint
The customer may complain that after a period of driving the sound system starts to emit static from all speakers and may even revert to a constant buzz.
Cause
Under Investigation
Measure
In order to properly diagnose this complaint it must be duplicated.
Does the noise occur in all audio modes, AM/FM/CD?
Does the noise emit from all speakers?
Is the noise static or garbled sound?
In most cases this noise will occur if the vehicle is driven for an extended period.
If the noise is static in all audio modes and is emitted from all speakers perform the following checks when the noise is occurring.
1. Disconnect the optical flash jumper located near the glove box. Is the noise still present?
2. Disconnect the TCU connector. Is the noise still present?
3. Replace TCU if after either of the above steps is performed the noise is gone.
4. Send TCU along with the steps performed in diagnosis to:
Paul Labrie BMW Service Engineering
1 BMW Plaza
Montvale, NJ 07645
If the noise is a garbled or distorted sound from all or some of the speakers perform the following checks.
1. Make a note if the noise is from all or some of the speakers.
2. Disconnect the connector from the amplifier briefly and see if normal sound is restored.
3. If normal sound is restored then replace the amplifier.