GM Volt Forum banner

1 - 20 of 22 Posts

·
Registered
Joined
·
86 Posts
Discussion Starter #1
Hey Everybody!

I was able to acquire an extra pedestrian sound module so I can mod it to make a better sound. I was wondering, is this module tied to a specific VIN or can I plug it right in in place of my current unmodified one?
 

·
Registered
Joined
·
873 Posts
Hey Everybody!

I was able to acquire an extra pedestrian sound module so I can mod it to make a better sound. I was wondering, is this module tied to a specific VIN or can I plug it right in in place of my current unmodified one?
I doubt it's smart enough to even be aware of the VIN, but where did you order it and how much did it cost? I've been wanting to mod mine as well. Right now it's simply disabled.
 

·
Registered
Joined
·
3,396 Posts
Jetson's car better be on your short list :)
 

·
Registered
Joined
·
873 Posts
I'd love to get one of those to play with. I would probably gut it except for the connecter and put a Raspberry Pi in there to gather data on what the pins are for. Then I could modify it and put other sounds in there, such as the Jetson's car sound, or some sort of inverter noise from a much larger electric vehicle.

Where does the module plug into the vehicle?
 

·
Registered
Joined
·
638 Posts
Jetson's car better be on your short list :)
Bahaha.

Personally I'd pay money for one reprogrammed with the Looney Tunes Roadrunner "meep meep" sound - my wife kind of thinks the factory pedestrial warning sounds akin to it, but the real thing would be a real winner in her books. ;)

Although Jetsons would be awesome too.

Someone could probably make big money if they designed one to take an SD card so you could change the sound at will.

Edit: Bummer, just noticed this was the gen2 forum, but I would kill for a switchable gen1 module. ;)
 

·
Registered
Joined
·
873 Posts
PrivatePilot, enjoy your ped horn, That is the thing I mist most on my '17.
I spent forever trying to figure out how to use that, because the MY16 manual says you can activate a pedestrian alert beep by flashing the high-beams. It's not a feature that exists on the car; they made it up for the manual, apparently.
 

·
Registered
Joined
·
158 Posts
Cool idea! Just looked through the junk car listings for another one, I think this is your donor car: https://wsimgproky.car-part.com/1754/2016/160941/F36FC94928FD4EB285C76B67386A36F1003_web.jpg

Looks like new about $67 plus shipping from GM sources. 2017 Chevrolet Volt Pedestrian Sound Alert Module 23321906

I wonder how difficult it will be? A pre-made playback board (or Raspberry pi type board?) enabled by the switched module power?

Theme from Tomorrowland? https://www.youtube.com/watch?v=3iUGORsHW7g (showed gen 2 volt near the end)
 

·
Registered
Joined
·
158 Posts
I'd love to get one of those to play with. I would probably gut it except for the connecter and put a Raspberry Pi in there to gather data on what the pins are for. ...
Maybe it would better to use the existing amplifier? (if the bandpass is usable, but it's noise, so maybe it is broad band enough to play the jetson's or other sound)
 

·
Registered
Joined
·
926 Posts
found it on ebay, it was salvage from one of the IIHS test cars. it was $42 + 15 shipping.

http://www.ebay.com/itm/142316862152?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
Huh, the listing links to another listing:

http://www.ebay.com/itm/2017-Chevro...70410e0&pid=100012&rk=1&rkt=4&sd=142316862152

that shows a Volt which looks like it had undergone a roof strength test, yet I don't see any videos on IIHS' Youtube channel yet. Hmmm, Volt doesn't look that bad. Wonder how it rated.
 

·
Registered
Joined
·
86 Posts
Discussion Starter #14
That must be the one. I have just plugged the "new" module in and it seems to work.

Here is the pinout:
1 High Speed GMLAN Serial Data (*-)
2 High Speed GMLAN Serial Data (+)
3 ground
4 Serial Data Communication Enable
5 Not occupied
6 High Speed GMLAN Serial Data (*-)
7 High Speed GMLAN Serial Data (+)
8 Pedestrian Friendly Alert Speaker Control (*-)
9 Pedestrian Friendly Alert Speaker Control (+)
10 Battery Positive Voltage
 

·
Registered
Joined
·
873 Posts
That must be the one. I have just plugged the "new" module in and it seems to work.

Here is the pinout:
1 High Speed GMLAN Serial Data (*-)
2 High Speed GMLAN Serial Data (+)
3 ground
4 Serial Data Communication Enable
5 Not occupied
6 High Speed GMLAN Serial Data (*-)
7 High Speed GMLAN Serial Data (+)
8 Pedestrian Friendly Alert Speaker Control (*-)
9 Pedestrian Friendly Alert Speaker Control (+)
10 Battery Positive Voltage
Nice pinout! I would guess that one serial channel is probably for the artificial noise and one channel is for the charging chime. 8/9 must go to the speaker itself. I'd have to plug a Pi in to see what sort of data is transmitted still, but that helps a lot!
 

·
Registered
Joined
·
873 Posts
The GMLAN looks like a ring topology. 1 and 6 are connected and so are 2 and 7

Interesting...I suppose maybe the module communicates with more than one other module, and they did it the lazy way and just had one LAN bus with two parallel connections...

I'd be interested to get a packet dump of the communication on those pins. I can't imagine it could be anything more complicated than PRNDL position, vehicle speed, and commands to play the chime for various charge-related events. I wonder how hard it would be to sideload a module in that feeds the "chime" command in when you press a button to replace that missing "pedestrian alert" feature...
 

·
Registered
Joined
·
926 Posts
Oh that is sooooo rad. So does it actually cut off the audio at speeds above 20MPH or does it slowly fade out the sound? Is it simple enough for average DIY or are access to special tools like in-circuit debuggers or JTAG interfaces needed?

Thank you, audguy, for giving us confirmation that it can be done!
 

·
Registered
Joined
·
86 Posts
Discussion Starter #20 (Edited)
close enough to be DIY, it looks like a few ways of doing it. I am currently cleaning it up to see how simple it could be. It will do what ever I want, currently I am reading directly from the CAN bus for selected gear, not speed related yet. I should be able to recreate the charging beeps as well. maybe even make them abit more appropriate.
 
1 - 20 of 22 Posts
Top