[Ovmsdev] Model S Data connector

Oliver Weidmann oliver at sdds.ch
Sun Jan 12 23:44:23 HKT 2014

Hi Otmar

Great to hear that you're working om Model S too. Here is my progress so far
(a copy of a mail sent some days ago):

>Well here are some details:
>The bus connector is located underneath the touch screen (grab the storage
shelf hole and pull STRAIGHT down).
>The connector is the same as in the Roadster. When reading the bus be sure
to attach CAN HIGH, CAN LOW and CAN GROUND (you can use normal GND, see
image). If you don’t use CAN GROUND, the car will get confused. The Roadster
doesn’t care if you use CAN GROUND, but Model S seems to be a bit >sensitive
on this topic. Also be careful with the +12V pin. If you produce a short
your instrument panel screen will eventually go black as they seem to share
the same fuse (which is the 5A fuse #49 in fuse box #2). 
>Ok, once all wires are in place and the car is still running, it’s time to
read some data. Bus speed is 500 Kbit/s (vs. 1Mbit/s in the Roadster).
>A fist quick look at the data showed me the following:
>ID 2C8 looks like the actual charge settings.
>67 32 = min Standard 
>67 5A = max Standard 
>67 63 = one tick before max Range 
>27 64 = max Range  
>Obviously the second bit bit represents the percentage of the charge
settings (32h=50dec=50%, 64h=100dec=100%). It seems to be a readout only
variable, as sending messages to ID 2C8 didn’t change the charge settings.

Keep us updated about your progress!


-----Ursprüngliche Nachricht-----
Von: ovmsdev-bounces at lists.teslaclub.hk
[mailto:ovmsdev-bounces at lists.teslaclub.hk] Im Auftrag von Otmar Ebenhoech
Gesendet: Sonntag, 12. Januar 2014 03:43
An: OVMS Developers
Betreff: [Ovmsdev] Model S Data connector

Hello OVMS creators, 

I'm new to the group, but some of you know me already. I'm doing crazy
things with a Model S and a VW camper which you can see via the link in my

I'd love to have service access to the Model S similar to what the service
techs have with the TDS software. Without that tool I can't even bleed the
brakes or cooling system. I don't like the idea of trailering my out of
warranty vehicle to a service center every time I need to do simple
maintenance.   I realize that kind of access may never happen, but I figure
I have to start somewhere and I assume that would be sniffing the CAN bus. 

As a small start in that direction I wanted a connector for under the center
console with all the pins populated. 
Mark was kind enough to offer the parts: 173631-1 and 173851-2 which are not
common and in stock in the US. 
I had already found that it looks just like the car side stereo connector
for Mazdas from the 1990's and those can be had on ebay for $6 delivered so
I bought a couple. 
They arrived today, and though the quality seems poor and the fit is snug,
the connector does fit. The other non matching connector can be used for
extra terminals to fill out all the holes, but getting them out without
damage is a challenge without a proper tool. 

It's clear that you all have already made great discoveries in EV monitoring
and control. I'm looking forward to sharing what we learn here. 

Otlist09 at evcl.com

Stretchla Project: 

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