Posts: 1
Joined: Fri Aug 16, 2019 12:40 pm

Need a help

Fri Aug 16, 2019 12:49 pm


I'm trying to find a wiring diagram for the little notice maker that makes a "beep" sound when you lock the doors. Excuse me, I don't know the name of this device.

What I want to do is figure out if it's a simple 12V piezo speaker, or something else. If it's a simple 12V piezo, I'd like to tap that with 12V to a switch on the inside of the car as a way to politely "beep" at pedestrians to let them know I'm sneaking up behind them in my 3000lb ninja mobile.

I don't really want to horn blast anyone, but just a little "beep", and since the car already has the noise maker on-board, I'd like to use that if possible. Else, I'll do something else.


Posts: 50
Joined: Fri Oct 13, 2017 7:28 am
Location: Austin, TX

Re: Need a help

Fri Aug 16, 2019 2:30 pm

I looked this up once and the beep appeared to be generated by the car alarm system and does not use a simple 12V signal but was connected to the CAN bus.


Posts: 33
Joined: Fri Mar 08, 2019 1:17 pm

Re: Need a help

Fri Aug 16, 2019 5:34 pm

There is supposed to be a pedestrian sounder mounted in the front on passenger side, operating at low speeds
On my i3 it is enabled from a settings menu
I had a friend listen to it outside the car, I dont hear it when driving

Posts: 755
Joined: Fri Apr 29, 2016 11:59 pm
Location: Huntsville, AL

Re: Need a help

Sun Aug 18, 2019 6:30 pm

Flash your lights.

Bob Wilson
20k/27k mi 2014 BMW i3-REx
10k/10k mi 2017 Prius Prime

Posts: 4788
Joined: Thu May 22, 2014 2:07 pm
Location: Nashua, NH USA

Re: Need a help

Sun Aug 18, 2019 10:06 pm

I think the newest i3's may have the pedestrian warning as the Feds in the USA are phasing that in as a requirement for EVs. But, it was optional/mandatory in other parts of the world from the beginning. If I remember, it only came on at speeds from 0-30km/h, figuring that tire noises above that were sufficient. No idea how it is activated or whether it is a separate piece of hardware.
Jim DeBruycker
2011 535i x-drive GT, 2014 i3 BEV

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