jrsmith_68

For those of you that may have been thinking about or wanting active TPMS for your W203, I have found a way to add it that is fairly easy and not too costly. There is an old thread that discusses the addition of TPMS by Sunil and Steve. This was discussing the old Beru system that is very expensive and a PITA to install. The new Schrader system used on the W209s is very cost effective and was a breeze to retrofit on my W203. As a disclaimer, I have to say that this may only work on a facelift W203. I am not sure if the older EIS can communicate with the TPMS module. Also the beauty of the Schrader system is that you can get the wheel sensors for a good deal as they are the same ones used on some Chryslers.

Utilizing good ol’ eBay, I got a set of sensors for $88, a used W209 (also W463 G-class) TPMS module for $70, and I bought a 209 wiring harness for $16.25. The harness was a bit long, but that’s good as its easier to shorten than lengthen!!

My part numbers are:

Sensors MB A0035400217 / Chrysler 56029400AC
Module A0035403945
Wiring harness A2094404508

The sensors fit easily in my stock 2007 six spoke wheels without any mods. I used double back emblem tape to fix the module to the quarter panel. I have attached a few pics from my install and a copy of the schematic to give you an idea of where the plug in the harness. There are three connections, the module, the Rear SAM and the CAN node under the driver’s side instrument panel. I also included step by step DAS instructions, nice thing about this is you don’t need Developer, it can easily be done by a dealer. Well easy is a relative term.

If something is confusing or you need a little more info, let me know!

Boom vang

good job!

turbonos7

WOW! Good job man... I was just asking myself the other day how come these cars didn't come with this but never mind! Granted it is sometimes more of a pain than not because in my wife's LR4 the light comes on all the time and the tires are good in pressure but I like the way this system displays individual pressures... not just a random light saying "Check ALL TYRE pressures" Great post!

VVF

I say sticky!

What do you mean by "three connections"? Do you have to pull the wire all the way from the trunk to the driver's side instrument panel area?

turbonos7

STICKY!!!!

lkfoster

Excellent effort! I have the passive TPMS, which I've been happy with so far but now I'm jealous.

I was surprised to see that they've moved away from individual receivers at each wheel. I've used similar aftermarket systems but there the receiver was centrally located to avoid distant signal problems.

And does this mean that every time you rotate your tires you need a SDS to reprogram things? My aftermarket systems had provisions for re-programming but I don't see how it would work here.

BF_JC230

Hi,

Can you please share an image of this: "the CAN node under the driver’s side instrument panel"

Thanks,
Jake

turbonos7

Since we run staggered setups and can't really rotate tires then this wouldn't really be a problem...

VVF

Well, you can still rotate them side-to side

lkfoster

True enough, but we can still do side to side. I run Conti DWS' with a mileage warranty as long as they're rotated. Given our stellar rear tire life it definitely comes in handy.

jrsmith_68

Jake,

This is the location I used to connect the CAN wiring. You have to drop the plastic panel under the steering column. Sorry for the small pic, its out of the service manual.

jrsmith_68

I know the system can detect the direction of rotation, maybe after rotating you can reset via the IP, but not sure. I looked in the 2009 CLK owners manual and there is no mention of what needs to be done when rotating. I'll have to report back when it comes to rotation time, but since I have staggered it will only be side to side.

jrsmith_68

Yes, there is the connection to the module itself, the connection to the Rear SAM for power, and the twisted pair plugs into the CAN under under the steering column. I just posted a pic of this location. It wasn't tough to run the two wires up, just had to pull the door sills and stuff the wires into the tray.

VVF

Cool, thanks.
This is really a useful mod.

I am finding more and more reasons to acquire a STAR unit...

jrsmith_68

Oh yeah, its a fun toy. Get the keys for Developer, then you can do things like get your sun roof to close when it rains.

BF_JC230

JR - Please post how to do this! I see it being so simple...the front rain sensor is powered...senses rain, knows sunroof is open - shuts it. It does not seem that hard!

Preet

can you please post the diagram of the Rear SAM jrsmith_68

jrsmith_68

Jake,

I'll start a new thread on the sunroof issue, it looks like that easter egg is still elusive on the forum. I'll have to plug into the car and get some screen captures as the menus are different in the DAS simulation.

jrsmith_68

Preet,

Are you looking for the #7 location where you plug in the harness? Its on the backside near the top and is indicated by a white mark.

Preet

thanks jrsmith_68 but I am actually interested to see the diagram connections, I am trying find where the relay is for the door lock blinkers or where the alarm siren wires are connected too

jrsmith_68

Preet, have you searched at all? These two threads don't get you the info you need?

https://mbworld.org/forums/c-class-w...gram-w203.html

https://mbworld.org/forums/c-class-w...-d2b-most.html

BF_JC230

Do you think a w204 (other) module would work? They seem to have a little more used availability. Perhaps it is a case of part number superseding...?

jrsmith_68

Its hard to say, I don't know the reasons for the different part number. According to EPC, that part number does not supercede the one used on the 209s and 463s and was actually only used on the 204s. Also the ignition switch (EIS) is a different part number for the 204s, which is not a surprise, and I believe still acts as the central gateway. Therefore the CAN messages may be different. The only way I can think to find out is to buy one and try it, if its cheap!

Preet

thanks a lot jrsmith_68 its a start

rbr115

I have a 2005 clk500 (w209). I added the parts as shown and did the initial setup under DAS. The unit is being seen and the tire sensors are entered into the tpms unit using the initial setup under chassis.


However, when I tried to turn on the tpms under body (the first part of programming you show) the only option was "without position related pressure values" I chose that and turn on tire warning.


I am still getting an error message of tyre pressure inoperative


any suggestions on how to make the 209 think it is a 2008 (which is when the parts are from?