C2.3 Ice
To checkCheck whether the tone comes from the PWM control of interior lighting dimming when the door is closed.
1. Switch on the radio.
2. Open a door and close it again. A tone is heard while dimming of the interior lighting takes place.
Procedure
The fault can be rectified by fitting interference suppression kit 48 72 677 (CA=30567465) as described below:
1. Remove the ICE control module as described in group 3 "Electrical system - ICE".
2. Unplug the connector and extract the pin at position 23 (grey/green lead).
3. Cut off the connector.
4. Crimp the grey/green lead together with the capacitor's lead in a new terminal.
5. Refit the pin in position 23 and plug in the connector.
6. LHD: fit the interference suppression capacitor on the left-hand grounding screw at grounding point G33.
RHD: fit the interference suppression capacitor on the right-hand grounding screw at grounding point G34.
7. Check the result of the above measures by opening and closing the door when the radio is switched on.
8. Refit all parts that have been removed.