Tire Pressure System in the works

[sunman]

I spent nearly 2 hours playing with DAS hooked to my car and found that the Tire Pressure Monitor can be added to our cars. I am not sure about 2005 but should be fine for 2001-2004.5. Please don't ask me if it will work with your car. I am not done doing research for it. It will still take me some more time. I haave the menu activated in IC and shows the picture of the car with PSI readings. When i press the reset, i can recalibrate the sensors. There is still lots of work to be done with this so I will keep everyone updated. I will post pictures of the menu.

here are the pictures
http://homepage.mac.com/drsunilpatel/PhotoAlbum14.html

 

[A-AvantGarde]

Thanks, can't wait to see what you find out, looks promising!

Impressive mods you've carried out so far.

 

[wsscott]

Sunman-I've got a 2006 CLK 350 and want to put tire pressure monitoring on. Did you buy a Mercedes kit and install it on the car, or is it from another source? How difficult was the install, basically what did you have to do if you don't mind taking the time to explain. Thanks

 

[Shude]

Sunman-I've got a 2006 CLK 350 and want to put tire pressure monitoring on. Did you buy a Mercedes kit and install it on the car, or is it from another source? How difficult was the install, basically what did you have to do if you don't mind taking the time to explain. Thanks

AFAIK, TPM is a software option for your car and can be activated by a technician when using the star diagnostic system at the workshop.

There is at least one thread discussion this topic started by forum member R2D2

 

[wsscott]

You mean you don't have to run any sensors, etc., they're already installed and STAR just needs to be run to activiate? If its just software, why doesn't it just come activated? Thanks.

 

[Shude]

You mean you don't have to run any sensors, etc., they're already installed and STAR just needs to be run to activiate? If its just software, why doesn't it just come activated? Thanks.

The sensors used are fitted to practically all mercedes models with traction control since the early 90s! It is just a comparison of relative wheel speed at each corner.

Here is a thread for you to read: http://www.mbclub.co.uk/forums/showthread.php?t=22688

 

[Rory]

The sensors used are fitted to practically all mercedes models with traction control since the early 90s! It is just a comparison of relative wheel speed at each corner.

Here is a thread for you to read: http://www.mbclub.co.uk/forums/showthread.php?t=22688

It looks like Sunman has fitted the 'proper' kit though - the sensor aerial is shown.

The software only mod, which works using the traction/abs sensors, doesn't show the pressures - it just does a comparison based on variations in the rolling circumference of the tyre.

 

[sunman]

There are 2 types of systems available. Passive and Active.

Passive monitors the difference is rotational forces of each wheel using the ABS sensors. Most cars 2005 and later can be activated to use this feature using Star Diagnose. It will not tell you which wheel is low or how much the individual pressures are.

Active System : has sensors inside each wheel. These are battery operated sensors with a life of 5-7 years. These sensors send signals to antennas in the wheel well which inturn send signals to a control module and via canbus send the pressures to the instrument cluster. If there is low air in any tire, it will tell you exactly which tire the air is low.

 

[Shude]

Active System : has sensors inside each wheel. These are battery operated sensors with a life of 5-7 years. These sensors send signals to antennas in the wheel well which inturn send signals to a control module and via canbus send the pressures to the instrument cluster. If there is low air in any tire, it will tell you exactly which tire the air is low.

Doesn't tell you the tyre temperature too does it? At least one aftermarket product does that and it seems useful, especially if one tyre seems excessively hot compared to the others but similar pressure...

 

[calum]

Doesn't tell you the tyre temperature too does it? At least one aftermarket product does that and it seems useful, especially if one tyre seems excessively hot compared to the others but similar pressure...

Mind you, if something were heating it up, then the pressure would go up, too, surely?

 

[Shude]

Mind you, if something were heating it up, then the pressure would go up, too, surely?

Not if it were losing air at the same time

 

[calum]

heh

 

[Uky]

Modern TPMS systems do compensate for a pressure rise as a result of an increased temperature of the tire. "Ordinary" people think that TPMS can detect a rapid fall of pressure, something they are not intended for. The sensors are quite intelligent. They will go to sleep (or park mode) when the car is parked. If left for the winter they will go to deep sleep. When the car is started again they will wake up and notify their identity to the car's RF receiver.

The application that I support uses a Siemens system that utilizes the vehicles ordinary RKE receiver. When parked it uses 868 MHz ISM band for RKE. When the vehicle is started the receiver is reconfigured for 434 MHz TPMS. The wheel units are awakened and reports their ID's to the vehicles CEM and the system is "up and running". In order to be able to change wheels, not all systems really tell which tyre is the faulty one but merely reports that one of them is running flat. Exchanging front and rear wheels (for wear balance) would mean that such a system would have to be reinitiated with the new positions.

 

[sunman]

mercedes also switched to the siemens system after 2005. Beru was giving too many problems. Benz uses 433mhz sensors.