property gate control malfunctions

property gate control malfunctions

I use an HID Prox Pass II to open the gate to my property. They continue to fail after a week or two in the car. I expect it has something to do with the electronics in the Model S. The pass uses RF signals. The tech dept. at Tesla knows nothing about this. Has anyone experienced this problem?
gilbert | 11 août 2014

I'm not quite sure what the Prox Pass is, but it sounds like some kind of transmitter. The Window in the Model S (and quite a few other new cars) has a metal layer that blocks signals from many devices. It's there to reduce heat transmission.

There is a spot on the windshield at the top center right of the mirror where a signal should go through. Early cars do not have this RF clear area. I think the change was made around the Spring of 2013, so if your car is newer than that, you just need to attach/place the transmitter in this area.

shop | 11 août 2014

Yes, the proxy pass needs to go in the special area, like TeslaTap mentioned, so that the signal can get to the reader.

If you still have problems, you can see if your residential gate could be retrofitted with a normal rolling code RF receiver. That way you can use the car's homelink buttons.

The proxy pass is easier as there are no buttons to press.

gilsnolan | 12 août 2014

The technician at HID (the manufacturer of the reader and pass card) claim that he knows of a similar card failure when it was used in a police car that had lot's of electronics installed under the dash. He could not explain it any further.
My cards worked fine for several days but after that it fails. I think there is a field of electronics inside my car that is damaging the circuit in the pass card. Does this make sense?
thanks for any input.

murphyS90D | 12 août 2014

Police cars have high power radio transmitters that might damage improperly designed circuitry.

How hot does it get in the car when the car is parked in the sun?

What exactly is the "pass card"? Is this a credit card size card with an RFID chip in it?

Does it stay in the car or do you take it with you?

johncrab | 12 août 2014

Something in my Prius was killing my company ID on a regular basis. The chip in the ID card would just go blank, so it may be RFI from the inverter in both cars. My fix was to request a MIL SPEC ID card with a "hardened" chip in it and that fixed it.

gilsnolan | 12 août 2014

The ProxPass card remains in the car but the heat has not been a problem. I used the same pass in other cars under the same conditions. Please tell me what a RFI inverter is. Does anyone know if there is a way to protect the card from causing it to stop functioning. (?)

murphyS90D | 12 août 2014

The normal definition of RFI is Radio Frequency Interference so I have no clue what an RFI inverter is.

Charger | 13 août 2014

You may be able to "shield" the card while not using it in a metal case, such as an altoids can or something similar.

SUN 2 DRV | 13 août 2014

In what way does the card "Fail" after a few days? Intermittent functionality, Melt, Burst into flames, what? Does it ever start working again? | 13 août 2014

The RFI in the Model S is quite low and unlikely to be the cause of any problems. If the device is failing due to RFI, it's very poorly designed. Your cell phone will produce more RFI than the car (although the car does have it's own 3G connection which produces some RFI). The primary motor has an inverter, but this is fully shielded. Without a shield it would produce some RFI, but again, since other devices (cell phones, radios, etc.) all work fine, it's not a source of the problem.

Try this - open the driver window and hold the device outside the car. If it works, then the device is fine and the issue is the signal is not strong enough to get through the windshield's metal coating. You can try different places in the windshield, but the best place is next to the mirror where the black dots are printed on the windshield.

Let us know how it turns out.

PV_Dave @US-PA | 13 août 2014

I agree with the prior two posts: If a "failed" card can be transferred to another vehicle and works there, then it's simply an RF shielding issue. If the card which previously worked consistently no longer works at all, even when outside of the Tesla, then it might be that you need a "hardened" version which is less susceptible to electromagnetic interference. Or you could switch to a different signaling system, understanding that would likely involve the inconvenience of an active rather than passive activation.

Bill D | 14 août 2014

After some testing, I found that my RFID security gate transponder (labeled "Transcore") worked best taped inside my nosecone on the far left (driver's side). The far end worked much better than the center because of the proximity of the internal metal bumper. It also worked on the windshield black dots behind the rear view mirror, but not as good as behind the nosecone.

gilsnolan | 14 août 2014

Just to be clear, HID ProxPassII entry card is normally read by the reader at the entry gate. It uses an RF signal. It is currently in use in a few hundred cars in my condo complex. All work with no problem and have done so for years. Mine worked for my other cars including my Tesla Roadster with no problem. However, when I use it in my Model S, it dies after a week or two. I replaced it four times with a new card at cost of $45.00 each. I would love to hear from any MS owner who has experienced the same issue and if there is a solution.

PV_Dave @US-PA | 14 août 2014

So when it "dies after a week or two", that means that it no longer works at all, even outside of the MS? | 14 août 2014

gilsnolan: unlikely that the card was damaged but not impossible.

Here are two key bullet points from the HID Global website
Provides up to six foot read range.
Velcro backing attaches easily to interior of vehicle windshield.

The card that goes into the car is a passive RFID card that is stimulated by a signal from the reader that provides enough induced power for the card to transmit a signal back to the reader containing a code for the number of assigned to the card. A six foot range does not provide a lot of slack. As suggested by the second bullet point above and the reply to this post by others, the windshield or nose of the MS may work as mounting points.

The frequency of the radio signal from the reader is about 13.5 MHz, according to the HID website. 13 MHz is a pretty low frequency that is typically less affected by shielding than much higher frequencies like WiFi for example. However, the RFID card with no internal battery must transmit at a very low level so even a little shielding could be enough to render it inoperable(likely).

Bottom line: As Tesla Tap suggests, try the card close to the reader to verify operation. If good, try the windshield as a mounting point for best results and get your money back for the unneeded cards. If the cards don't work when placed close to the reader, then you might send a damaged card to HID and ask them to give advice.(unlikely)

mclary | 14 août 2014

be more specific or go home!

What is the point to your post again?

eyadania | 2 juin 2015

I just purchased my Model S 2 months ago and have gone through 3 ProxyPasses already. They just stop working in the car and other cars. They die. Somebody suggested to me that it is the electromagnetic field of the car that damages the ProxyPass opener and suggested placing it in a metal box of some type. Has any body tried that?