Body/Electrical - Drone From Front Of Vehicle When Horns Sound
SI B61 12 12
General Electrical Systems
April 2012
Technical Service
SUBJECT
The Horns Create a Droning Noise When in Use
MODEL
F01, F02 (7 Series)
F04 (ActiveHybrid 7)
F07 (Gran Turismo)
F10 (5 Series)
F12, F13 (6 Series)
Vehicles produced to October 7, 2011
SITUATION
When the horns are used, a droning noise can be heard coming from the front of the vehicle.
CAUSE
The horns are riveted to the front bumper support. Faulty riveting creates the droning noise.
PROCEDURE
Complete the following procedures for both horns on the front bumper supports.
1. In order to gain access to both horns, refer to ISTA Repair Instructions:
"61 33 050 Removing and installing/replacing left fanfare horn"
"61 33 055 Removing and installing/replacing right fanfare horn"
2. Drill out the rivet holding each horn in place, and remove the horns.
2010 BMW 750i (F01) V8-4.4L Turbo (N63) Page 92
3. Enlarge the hole on the bumper support to a diameter of 6.8 mm for each side.
4. Enlarge the hole on the horn bracket to a diameter of 8 mm for each side.
5. Mount the horns to the bumper supports using a new self-tapping screw. Torque to 5Nm.
6. Reinstall the previously removed bumper parts as per step 1, ISTA Repair Instructions.
PARTS INFORMATION
2010 BMW 750i (F01) V8-4.4L Turbo (N63) Page 93
