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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > What is this? Looks like a speaker!
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      09-09-2015, 11:05 AM   #45
Billfitz
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Quote:
Originally Posted by DJ Rocc View Post
Speaker for Active Sound, so the sound sounds like its coming from engine?
Logically the active sound would be routed through all the speakers, so that you can't tell where it's coming from, and so that the low frequency content would go through the subs.
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      09-09-2015, 11:10 AM   #46
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Quote:
Originally Posted by Billfitz View Post
Logically the active sound would be routed through all the speakers, so that you can't tell where it's coming from, and so that the low frequency content would go through the subs.
Yeah it was kind of a joke?
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      09-09-2015, 08:47 PM   #47
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This is from documentation for an e9x but I think after you consider the information it's fairly obvious now that it's the SOS/emergency speaker.

The wiring pinout for the TCU (telemetrics unit) says:

37 Yellow/white 21 Emergency Speaker +
38 Blue/White 20 Emergency Speaker -

One main purpose of the TCU is to provide two GSM connections for assist and emergency. GPS if not equipped with NAV, for emergency, and so on.

So whoever had the hunch about it being for an emergency and bypassing the stereo and amp for reliability is correct.
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