C1. Background Noise

On M94 cars and up to and including M96 cars, the ICE may be the cause of background noise. Starting with M97 cars an interference suppressor has been introduced in the ICE.

To check

Turn the ignition switch to the OFF position and activate the radio. Tune in a weak station. Remove fuse 35. This should result in a noticeable reduction of the noise.

Procedure





Fit interference suppression kit 48 72 677 (CA=30567465) as described below.

1. Remove the cover from the main fuse box.

2. Remove the lower section of the dashboard on the driver's side.

3. Remove fuse 35 and extract the blue/black lead from the fuse holder.

4. Cut the connector off the lead.

5. Cut the interference suppression capacitor's lead to a length of 100 mm (4 in.).

6. Crimp it together with the blue/black lead in a new connector and plug the connector into fuse holder 35.





7. LHD: fit the interference suppression capacitor on the right-hand grounding screw at grounding point G33.





8. RHD: fit the interference suppression capacitor on the right-hand grounding screw at grounding point G34.

9. Refit fuse 35, switch on the radio and check the result of the above measures.

10. Refit all parts that have been removed.