LDH

Does the US model of the gl use sensors(active monitors) or does it just count pulses from the wheel speed sensors? I am thinking of changing wheels.

Wolfgang

Uses an ABS based deflation detection system (DDS). Here's a picture from the supplier Continental AG. They just put up their new site in Chinese.

mguerreiro

I bought a set of winter wheels and tires for my GL from Tire Rack. Even bought 4 new Siemens 433Mhz pressure sensors/transmitters costing $140 each.

Last weekend I put on the snow tires and found the low tire pressure alarm activated. I checked the inflation pressure and reset the sensor. Unfortunately, the alarm continued to activate.

My dealer tells me that they have to reprogram the vehicles computer to recognize the new sensors at each wheel position. They want to charge me $120 to do this. Evidently, this is also required if you rotate the tires.

Can this possibly be true?!

mguerreiro

An MB factory technician told me that the TPMS system needs to "relearn" the new sensor positions whenever you change wheels, even for a routine tire rotation. This process requires the use of the "Star Diagnostic" system, which only MB dealers have.

Needless to say, the owners manual doesn't include any information about this.

This is annoying.

Wolfgang

The online manual for the GL has a section for tire pressure monitoring.

Two different systems are described. The low tire pressure warning system, based on ABS wheel speeds, is described starting on page 304.

The tire pressure monitor system using sensors at each wheel is described starting on page 306.

http://www4.mercedes-benz.com/e/cars...5_betrieb.html

LDH

so the 07 gl does have sensors at each wheel and does'nt just count pulses using the abs sensors BUT does not dislpay tire pressures or tell you which wheel is low and cannot handle the tires being rotated. Once again it seems that MBZ has over-engineered what should be a simple system. i find the comand system and the owners manual devoid of any real tech/service related info. I like the GL and the wife uses it as her daily driver and I use it for towing but we will see if this things stays around once the warranty nears the end. I like cars that I can work on myself and appreciate sound/quality engineering. I don't think you are going to see older high mileage examples of the current MB lineup like you saw with the older models.
Enough ranting for me I am going to go ride my motorcycle.
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Wolfgang

No, that mixes up both systems. As far as I can tell the USA model GL450 and GL320 CDI come standard with ABS based tire pressure deflation detection without the transmitters at each wheel.

Only those GLs with option code 475 have the tire pressure monitoring system with transmitters at each wheel. This option is offered for EU295 for the GL450 and GL500 in Germany and I am not sure if it is offered in the USA.

Here is a great and simlpe overview of both systems on the info page from the supplier, Continental AG:

http://www.conti-online.com/generato...g_1103_en.html

Wolfgang

The maintenance and service DVD for the GL just came out. Check out the Introduction Manual on there. Also wiring diagrams, component locators etc etc etc.

https://www.startekinfo.com/StarTek/...stedDocId=8001

This info is also available online in case you dont wont to buy a DVD, at http://www.startekinfo.com

LDH

thanks for all the great input you offer to myself and others.

pas

This is 100% bs I changed wheels on my e55 with tpms and all you have to do is go to the tire pressure screen and it will say something like "tire pressure displayed only after driving a few minutes" hit the odometer reset button and that will reactivate the tpms and it will be working fine. The dealers say it needs to be done by them so they can charge you an extra hour. I had to show the dealer the owners manual to get them to give me a credit.

texas008

for my 2007 GL450, I've done many tire rotations, replaced old tires with new tires, at Discount Tire, and have never seen the need to performed TMPS "relearn".

Max Blast

It is done automatically within a 30 minute drive. System needs to sense four pressure signals within 30 minutes to either keep the warning light from coming in, or sense lack of one or more sensors within 30 minutes to turn the light on. It’s a pretty dumb system.

texas008

Thanks for the info. does it mean that no "programming" is needed after replacing the bad tpms sensors with new ones? thanks

Max Blast

Correct - if you have the right frequency sensors they should auto identify.

eric_in_sd

FYI I think it is ten miles, not 30 minutes. When I was trying to isolate which of my four sensors was bad - I replaced with good wheels one at a time - I noticed the warning light coming on at the same distance, 10 miles, from my house each time.

eric_in_sd

I am unclear on whether they have to be pre-programmed to call out "hey, MB receiver, this is MB transmitter". There are 433 MHz sensors but noise is made about them needing to be programmed.

texas008

Discount tire has the 433MHz sensors for $61 each installed with 6 year warranty which can be very useful (on another car I've had three REDI sensors dead within warranty period and DT replaced those free of charge)
I'm surprised that the tpms sensors on my 2007 GL450 (116k miles) lasted so long, as of today the "tire pressure monitor inoperative" warning light went off (it has been on and off for a while).

eric_in_sd

For comparison, Rock Auto has the BH for $32 plus shipping, and my local tire shop will do the swap for $12. I'd be tempted to go the Discount Tire route purely because the warranty applies to the R&R as well. At least I assume it does.

With a bead breaker you could do the work yourself, but frankly it's a chore.

texas008

All my tires were purchased at Discount Tires, they get rotated and re balanced every (other) year.
And it's a good opportunity to check the brake pads thickness while the wheels are off.
It's good to see that Discount Tires are using Milwaukee Fuel M18 impact wrenches.
The shops are much cleaner and quieter without the air tools and air compressors.

lkchris

Recommend Intellisens sensors. They have versions that do not require programming ... just press the R button. This might save you the extra $100 the wonderful tire guys would charge you to program.

texas008

Just replaced two tpms sensors, the other two are still working. its amazing that those original sensors lasted 17 years.
The original sensors are Siemens VDO Daimer Chrysler 433.92MHz sensors
Discount tires used the BHsens Intellisens UVS7050 73.913.750 315/433MHz sensors.
No programing was performed and the "tire pressure monitor inoperative" warning message is gone.

eric_in_sd

The BH sensors are the only ones sold by Rock Auto. I had mixed results with some Chinesium sensors; one out of four failed intermittently for a couple of years and then finally quit for good.