[e_arunsid]

HI,

i am a new BMW user and bought a 2015 328i two months ago.. I have tried to reset the tyre pressure but not sure if what i am doing is correct or not - because the tyre pressure doesnt seem to reset at all

Steps Tried

1. Top up Tire Pressur to any value which is greater than 32PS
2. Go to Idrive Menu -> Vehicle Info - > Status and press on reset tire pressure
3. Car waits for my drive to begin and starts displaying a message which says " resetting tyre pressure and shows a % value which changes from 0 to 100
4. Even after this step is complete , i see the tire pressure to be same as it was earlier

Any thoughts

[Billfitz]

Originally Posted by e_arunsid

[*]Even after this step is complete , i see the tire pressure to be same as it was earlier

Of course, as you haven't done anything to change the tire pressure. The reason for calibration is so you don't get a false warning, or if you rotate tires/wheels. You don't start with any pressure over 32PSI, you start with the recommended pressure. The warning for low pressure goes off when pressure goes a certain percentage below the pressure present when you do the re-set. If you re-set at, for instance, 36PSI then you can get a warning at 32PSI.

[tex2670]

I didn't see in your steps that you drove around. You can't reset while stationary. Fill tires to the proper pressure, select reset, then drive a few miles during the reset procedure.

[Project Elite]

Originally Posted by tex2670

I didn't see in your steps that you drove around. You can't reset while stationary. Fill tired to the proper pressure, select reset, then drive a few miles during the reset procedure.

The iDrive actually tells you to stay put with engine on. I started the reset at a red light but started driving before it finished. It worked anyways.

[tex2670]

Originally Posted by Project Elite

The iDrive actually tells you to stay put with engine on. I started the reset at a red light but started driving before it finished. It worked anyways.

You have to be stationary to start the reset, but you need to drive around to get the full reset completed.

[e_arunsid]

Originally Posted by tex2670

You have to be stationary to start the reset, but you need to drive around to get the full reset completed.

Yes. That is exactly what i am doing. I press reset when stationary and then drive it and let the reset complete .

But the tire pressure still stays the same

[Billfitz]

Originally Posted by e_arunsid

But the tire pressure still stays the same

The tire pressure will stay the same until you either add or remove air from the tires. Re-set can't do that for you. All it can do is re-learn the tire positions if you rotate, and change the reference pressure for the low-pressure warning to whatever the pressure is when you do the re-set.

[e_arunsid]

Thanks a lot for the explanation

[Wakka]

thankfully the car is fairly idiot proof (or so the germans thought...) it really wants to let you know that your air is low

[tex2670]

Originally Posted by e_arunsid

Yes. That is exactly what i am doing. I press reset when stationary and then drive it and let the reset complete .

But the tire pressure still stays the same

You keep saying the tire pressure stays the same--resetting doesn't change the tire pressures. It tells the system to reset the baseline measurement.

I had this issue--I had 32 front, 35 rear. On a cold morning, the pressures were low, and I filled the tires back up to these levels. But the warning didn't go away, like on my prior cars. Tech said because this system actually shows the pressures, rather than just a pass/fail system, you need to perform the reset after any warning.

[Billfitz]

Originally Posted by tex2670

I had this issue--I had 32 front, 35 rear. On a cold morning, the pressures were low, and I filled the tires back up to these levels. But the warning didn't go away, like on my prior cars.

This is where the re-set comes into play. My stock pressures are 32 all around. I got a warning. The lowest pressure was 30, so the warning wasn't warranted. The reason I got the warning was that for some reason my calibration was at 35, which I figured out when the warning didn't go away until I filled them all to 35. After filling to 32 (cold) I did a re-set and I was OK from there on.

Let's assume that you were calibrated to 35 all around. That could set off a warning for the fronts at 30, and filling to 32 probably would not take the warning away, as once the warning goes off the system wants you to fill to the base calibrated pressure. Fill the fronts to 32 and the rears to 35 and do a re-set and your problem should go away.

I never had this happen with my old car with first gen TPMS. It would give a warning based on a factory set minimum pressure. Once filled to anything above that minimum, 28 as I recall, the warning went away. But that system wasn't anything like the current BMW, as it didn't have the ability to tell you the pressure, or to do a re-set. It was a simple pass/fail.