Doctodd33

just got new S65 rims and tires....looks like the original balancing weights are still on, so im assuming(maybe incorrectly) the TPM's are still inside the tires. Does anyone know how to check without removing the tire from the rim, or using an xray machine? Im getting an error message saying no TPM's are connected.

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whoover

TPMS valve stems are all metal and attached to the wheel with a nut. If you see rubber where the stem comes through the tire, it's not TPMS.

Diesel Benz

True, but if one has TPMS valves, it does not necessarily mean the sensors are installed.

But if the system cannot recognize the sensors, they cannot be present (or are dead)?

Doctodd33

valve stems are the same....i was told to have MB remap the sensors. We shall see.

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whoover

yes it does. The TPMS valves are integral with the sensors.

On my 220, you can reset the TPMS system by pressing the R button when the display shows that the sensors are not linked. Try that, or see if your manual has a different procedure.

Doctodd33

where is the R button?

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whoover

On the 220 it's the button you use to reset the odometer and everything else that can be reset. I'm not sure what the 221 equivalent is. Check the manual.

Doctodd33

Where is it?...on the dash?

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Diesel Benz

Is it different with the new Siemens sensors? The old Beru sensors are separate from the valves.

Edited: from the EPC I find the W221 having a very similar setup as the Beru, the valves are definitely a separate part, the sensor attached to the valve with a screw. It is possible to install only valves (a different issue if it makes sense).

Diesel Benz

The manual? :-)

On a W221, you have to work through the instrument cluster, service menu. The first section attached.

Seems different from the Beru system as the manual claims that you have to have the car 20 minutes parked after wheel rotation or sensor change, before a reattempt to reactivate it.

Could it be that someone has installed the Beru sensors on a Siemens system car, of vice versa?

whoover

Agreed. Theoretically, someone could remove the sensor body from the valve stem, but I'd consider that removing half the TPMS unit. You'd then have to find the right stem and the right valve core (it's special too) for the new fitment. In practice, if you swap a TPMS sensor, you remove the entire unit.

Thanks for pointing out the W221 equivalent to the reset button. As I said earlier I had no idea what it was.

Doctodd33

im happy to see some possibly useful information. I hope i have explained what im up against.....if i have to remove my old sensors from the 19" wheels i removed and are sitting in my garage, that would mean i would have to unmount 8 tires from their rims, remove the 19" sensors and place them on the 20" S65 wheels, then remount the tires to the wheels, then rebalance each tire which wont be as good as the factory balancing, and then done. A huge hassle.

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Doctodd33

ps......i looked at the valve stems in the 20's and they look the same as the ones on the tires i just took off. If anything, they look a slightly different color....the 20's have a "gold" color whereas the ones i took off looked more "metallic". So i think the TPMS are in the 20's. I just need to get the car to reconize them.

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ninjamedusa

check tire pressure menu OK

and then , push ▼ on your steering wheel

push OK

that's it..!!

i'm not sure......BUT..

Doctodd33

yea i think i tried that. By the way, does anyone remember what other member here put the S65 wheels and tires and then lowered his car? I think it was a dark blue car and he is even from my neck of the woods in Miami. Id like to ask him but i cant remember his screename? Thx in advance.

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