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I don't think your car has active TPMS and instead it has a passive system which works by comparing the speed of the tires via the anti-lock braking system, so you wouldn't be able to see the tire pressure in real time. Unless you have a GLB 35 or GLB 45, those should have active TPMS.
I don't know what type of TPMS the different GLB models use, other than the AMGs, but you can tell from the valve stems. If they are metal then it has direct TPMS with sensors in the wheels and if they are rubber then it has indirect TPMS using wheel speed sensors and signal processing. The latter though factors in more than just wheel speed differences. It measures specific oscillations in the wheel assembly that are known to have a direct relationship to the tire pressure. Indirect TPMS cannot measure actual tire pressure. You have to baseline it by performing a reset, after which it learns the base parameters for about the next 20 minutes of driving, and then compares actually measurements to the base parameters. If you do have direct TPMS then you should find the information in the service menu under tires. If it's an AMG, then there should be a temperatures and pressure display. As shown below with the digital instrument cluster and the Supersport layout in my C63, it is one of the displays I can cycle through on the right side, also showing transmission, engine oil and tire temps. It'll be different with the analog clusters.
Last edited by superswiss; Mar 22, 2022 at 08:56 PM.
Yes, mine is showing fulltime on the center in the instrument display. You have to push the home button on the left & use the touch pad to see the options and select service option (last one in the row). Tire pressure option is under the tire option in service selection. It shows how to change the center display in the below video.
Yes, mine is showing fulltime on the center in the instrument display. You have to use the touch pad on the left to see the options and select service option (last one in the row). Tire pressure option is under the service. It shows how to change the center display in the below video.
Yours is a GLB 35 so it makes sense that it has the active TPMS. If OP has a GLB 250 for example, the tire pressure monitoring screen should say something like "Run-flat indicator active, press OK to reset", as their wheels don't actually have TPMS sensors.
Last edited by W205C43PFL; Mar 22, 2022 at 09:27 PM.
Yours is a GLB 35 so it makes sense that it has the active TPMS. If OP has a GLB 250 for example, the tire pressure monitoring screen should say something like "Run-flat indicator active, press OK to reset", as their wheels don't actually have TPMS sensors.
I cannot speak for everyone, but my GLB250 has real time active TPMS. It displays actual tire pressure for each tire.
I cannot speak for everyone, but my GLB250 has real time active TPMS. It displays actual tire pressure for each tire.
Interesting, thanks for chiming in with the information, I am wrong then that all GLB 250 has passive TPMS since from your actual ownership experience confirms that not all GLB 250 has passive systems.
Looks like I missed forum member superswiss' reply, it was detailed and explains it well, especially checking the valve stem cap since as forum member Odd Piggy mentioned, not all GLB 250 has passive systems.
You can also look up your tire pressure on the Mercedes Me Connect app.
Those are largely useless. They are not current cold pressures when the car has been sitting, instead they are the last hot pressures at the time the car was parked. The sensors go to sleep after a while once the wheels stop rotating, so it can't read current pressures through the app. They wake up again shortly after the wheels start rotating. Takes about a minute before they start reading the current pressures.
My data card says 475 Tire-Pressure Monitoring System. It’s under standard accessories.
I do have Premium 1, 19” wheels, and 3rd row seats, but there is no mention of an upgraded TPMS.
Even if the active tire pressure is not present on some GLBs, the passive system is good. We had it on a non-Mercedes. It compared the rotation of the 4 tires to the speed and if there was a difference in one, it would send a “Check XX Tire” message to the instrument display well before the tire was completely flat.
I read the owners manual which states it will alert me if there is drastic changes in tire pressure but won't display the active readings like the other cars. I have the 19" wheels with the matte black accents.
Out of curiousity, what is a significance or an avery day advantage of having an active TPMS sensors, besides knowing what your tire pressure is, when the car is off? I can see an advantage of knowing actual pressure vs. older models that only indicate that pressure is low , but I would not care if the pressure determined via active TPMS or computer calculated based on other sensors.
Out of curiousity, what is a significance or an avery day advantage of having an active TPMS sensors, besides knowing what your tire pressure is, when the car is off? I can see an advantage of knowing actual pressure vs. older models that only indicate that pressure is low , but I would not care if the pressure determined via active TPMS or computer calculated based on other sensors.
Just to clarify, you will only see actual pressures with direct TPMS as it has pressure sensors in the tires (not sure what active TPMS is supposed to be). Indirect TPMS will never show tire pressures and it can't calculate them either. It's a relative system, not an absolute system.
TPMS whether direct or indirect only alerts of low pressure once a pressure loss of 20-25% has occurred. That can be quite a loss. With 30 psi normal pressure for example, that's at least a 6 psi loss. So an advantage of seeing the actual pressures is to detect a potential leak before the system alerts. I personally use it as a piece of mind when I first drive off and the tires are cold to check if the pressures look normal, and while driving I can see if the pressures are as expected, so that if I drive over something and start seeing a loss in one of the tires relative to the others, I know right away that something is off. But generally, I'm actually more interested in the tire temperatures. Since I drive a powerful RWD AMG, seeing the tire temperatures lets me gauge the grip of the rear tires, so I know when I can get on it once they are up to temperature, or when I have to be careful while they are cold. So the advantages vary I suppose. Most people like to see the pressures as an early detection mechanism before the actual alert comes up and it may be too late. Neither system really absolves from regularly checking the pressures using a tire gauge and visually inspecting the tires for damage and wear.
Does it mean that if the system shows the tire pressure (which GLB250 does) than it uses active/direct TPMS, even thogh it goes into a sleep mode once engine is off?
Does it mean that if the system shows the tire pressure (which GLB250 does) than it uses active/direct TPMS, even thogh it goes into a sleep mode once engine is off?
Yes. The sensors have batteries in them, so they go to sleep to extend the live of the batteries. There's no system that shows the tire pressures at rest, otherwise you'd constantly have to replace the sensors when the batteries are drained.
Yes. The sensors have batteries in them, so they go to sleep to extend the live of the batteries. There's no system that shows the tire pressures at rest, otherwise you'd constantly have to replace the sensors when the batteries are drained.
I wish they have a way to "wirelessly charge" it. I get it, it is rubber it doesn't conduct but there got to be a way. That said, the current sensors don't have rechargeable batteries, maybe when they do implement this on the new sensors they would if it makes sense for them to implement it. I always recommend checking tire pressures yourself every other day or at least once a week anyways, the TPMS is just an aid imo. I think the main purpose of TPMS sensors are to help drivers identify rapid tire pressure loss.
Last edited by W205C43PFL; Mar 24, 2022 at 01:23 PM.
I've had the same batteries in the wheels of my C63 for 8 years now. I'm sure they'll go dead eventually. To my knowledge the "TPMS rebuild" at the tire shop I go to doesn't change the batteries.
For me, I am curious to see what pressure settings my tires and if they are even instead of going around with a gauge manually. I guess I'll never know seeing as I have the indirect system on the GLB.
I looked through the menus and youtube, but for the life of me can't find how to view tire pressure on the GLB. What's the deal? Has anyone done this?
Depending on different regions, some options can be cut off. Mine is a GLB 35 and doesn't have TPMS even though there is TPMS section in my manual book.
My MBUX said Run flat is active but when scrolling down to Service there is no Tyre options for me to click in like other GLB 35.
I think best way to know is to call your dealer to ask whether you have that option.
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