BMW Squeak at Rear When Entering & Exiting Car – E39 & All
This answer is applicable for many BMWs in addition to the one listed below.
car year: 1997
car model: 540i
When I enter or exit the car I hear a squeak noise from rear of car, by the rear wheel. Can it be the swing arms(trailing arms)?
Without having the car here to physically diagnose, I can only give you some suggestions in tracking down the squeak noise.
I would suggest that you have a helper create the noise (enter/exit the car), while you poke around on your hands and knees to try to get a general or actual location for the noise. Once you have determined the general location, you can then work on narrowing it down (control arm bushings, swaybar links, shocks, etc.).
If the noise does seem to be coming from the rear, and happens when you enter/exit, it is likely suspension related (suspension being compressed as you enter and extended as you exit). This could be any of the rear suspension bushings, the swaybar end links, swaybar mount bushings or the shocks. Additionally, it could be the park brake assembly. If you normally have the park brake applied when this happens, try leaving it off (put the shifter into gear if it is a manual trans, or PARK if it is automatic).
Feel free to let us know what you find.