Dev Console "access code"

Dev Console "access code"

When I was in for a demo a while ago, the person in the showroom clicked on the tesla symbol on the display and held it for a second and it entered into a "debug/diagnostic" mode. I tried this on mine and it's asking for an access code. My delivery specialist and service manager won't tell me what it is. A few google searches turned up nothing. Does anyone know what it is?


Klaus | October 19, 2012

I'm guessing there's good reason Tesla won't tell you the access code. Some things are better left untouched. :)

olanmills | October 19, 2012

It probably allows a tech to get more diagnostic information about the car and perhaps manipulate things outside of normal paramaters.

It would be used for diagnosing, debugging, and or testing. I'm sure that they would not ever want customers to be able to access this.

sergiyz | October 19, 2012

root shell would be nice ;)

sfurman | October 19, 2012

I don't know the password, but I once sat in a car at a Tesla test drive event where the diagnostic menus were already unlocked. Most of what I saw looked like BMS diagnostics, indicating module voltage excursions and temperatures. I took a few snapshots:

Volker.Berlin | October 20, 2012

A few google searches turned up nothing. (joepruitt)

Try that again in a few months! ;-)

jerry3 | October 20, 2012

In general, the more information you have about how the car is performing the more you can adjust your driving to get the most out of the car. Of course, most people don't want to really grok the car, they only want to drive it with a minimum of fuss, but a few of us would like the hairy details.

PureAmps | October 20, 2012

@sfurman Interesting pics of the diagnostics screens. I wish you could have snapped a few more of the screens.

The "Display" screen is interesting because it shows all of the Cellular modem identifiers. So I was able to determine the car is on AT&T's network (already known), and is using Sierra Wireless's AR8550 part (based on the IMEI and the "8550" model on the screen). The AR8550 has an optional embedded SIM which is most likely what Tesla is using to reduce complexity/cost, which means changing carriers or plugging in your own SIM card on your data plan will be difficult, if not impossible.

Also of note is that AR8550 is North American only, and a separate part the AR8552 is needed for the Europe/Asia markets because different radio frequencies are used for HSPA (3G). This gives me some hope that the cellular modem could be upgraded in the future as they have most likely placed the modem on a separate circuit board module, so they can install the correct one based on the target market for the car.

Brian H | October 20, 2012

'It has been said' that the module for 4G is already in place, but not activated, pending negotiations, etc.

joepruitt | October 20, 2012

@Brian H, that's what my delivery specialist told me as well about the 4G. He said it's all onboard just pending a contract with the cell carrier.

PureAmps | October 21, 2012

@Brian @joe I've read the same things, but if they are still using the same Sierra Wireless part in the production cars then there will be no 4G/LTE without a hardware change. The easiest way to find out is to have a Tesla technician punch in the access code in a production sig and pull up the same screen and take a photo of the screen so we can lookup the IMEI vendor info (known as the TAC).

The screenshot provided by sfurman was from a release candidate vehicle (based on the VIN), so it is possible they made a change before production. But I find it unlikely since that is a significant change to be making and there is no production component in that same chipset line from Sierra Wireless that offers 4G/LTE. So Tesla would have to be using an unannounced product from Sierra.

I think it is more likely that they are negotiating a max "data rate" for the 3G technology and that AT&T considers certain data rates to be "4G" speeds. When I refer to 4G, I assume LTE is the wireless technology, but AT&T has played a marketing game with labeling their HSPA+ technology 4G. For example:

So when talking to Tesla about 4G connectivity, we should really be asking them if they are supporting LTE. My guess is they are going to support AT&T's HSPA "4G", and given the Sierra 8550 chipset, that means a max download speed of 14.4 Mbps, which is respectable, but no where near as fast as LTE.

Practically speaking I don't think you will ever come close to those speeds on AT&T's network (having been their customer for years in the Bay Area), which is why I happily switched to Verizon a few weeks ago.

nickjhowe | October 21, 2012

@Gscott - on the iPhone 5 AT&T doesn't even show 3G any more (at least that I've seen) - only 4G (Marketing!). Last week I was pulling 20MB/s on AT&T LTE in the Bay Area, but it is very patchy.

Ron5 | October 21, 2012

@nickjhowe, I'm sure you mean 20Mb/s, not 20MB/s.

nickjhowe | October 21, 2012

Yup Ron5 - typo. 20Mb/s - roughly the same as my home Comcast connection.