Key fob range limitation.

[Mrmonza]

Hello.
My wife always complain about not to be able to open car door when im putting stuff in the trunk so i google the matter and found this:

Key-fob Range LimitaƟon
DescripƟon: Extend the range of the key fob
● 46-Central Module Comfort System
● Long Coding
● Change range_limitation_lock, range_limitation_rear, range_limitation_opening,
range_limitation_panic, and central_locking_system_requst_for_range_function to Not
Active
● Press and hold green check mark to accept

Ist a cutout from a obdeleven coding document for audi b9.

But when i try this on my A7 2016 with obdeleven the list in 46 central comfort is just byte and bit, does anyone know what byte and bit to change to disable range limitation of the keyless system?

Best regards
Emil

[gk1]

I've used the "key fob under the chin trick" to extend the range. Works pretty well.

Check here I think this was listed for a Q7, but might be similar, but I would change anything without recording everything first.

Address 46: Central Conv.

Byte 28

UnCheck Bit 1 Range Limitation Lock
UnCheck Bit 2 Range Limitation Rear?
UnCheck Bit 3 Range Limitation Opening
UnCheck Bit 4 Range Limitation Panic

[trmills]

[QUOTE=gk1;14445764]I've used the "key fob under the chin trick" to extend the range. Works pretty well.

That's funny. I read that holding it to your forehead worked and I can attest that it does indeed work. Works great on all 3 of my vehicles of different manufactures.

[Phenotis]

[QUOTE=trmills;14446452]

I've used the "key fob under the chin trick" to extend the range. Works pretty well.

That's funny. I read that holding it to your forehead worked and I can attest that it does indeed work. Works great on all 3 of my vehicles of different manufactures.

There's actually physics behind it. The fluid in your head, namely in the meninges between your brain and skull act as an antenna of sorts, increasing the signal strength of any radio device.

There's actual scientific documentation somewhere (I forget where but it's definitely on the internet) where some scientists actually tested and verified it.

[gk1]

[QUOTE=Phenotis;14450890]

There's actually physics behind it. The fluid in your head, namely in the meninges between your brain and skull act as an antenna of sorts, increasing the signal strength of any radio device.

There's actual scientific documentation somewhere (I forget where but it's definitely on the intern) where some scientists actually tested and verified it.

science!

[Alabama]

[QUOTE=Phenotis;14450890]

There's actually physics behind it. The fluid in your head, namely in the meninges between your brain and skull act as an antenna of sorts, increasing the signal strength of any radio device.

I'm not sure that's quite correct. I believe the matter has more to do both with skin capacitance and with radio frequency and antenna design. From an internet discussion pointing out the matter of radio frequency (not key fobs): "Your body can act as an antenna, but definitely not in this case. For a 60Hz signal, the value of λ/2 is 2500 km, so your body has not nearly the right size to act as one. You have picked the mains wave via the capacitance between your body and the electric wires. Things change in VHF/UHF range, where your body can actually convert an electromagnetic wave to a signal. In analog TV era, this phenomenon could be easily seen when tuning the "rabbit ears" dipole antenna: the reception quality would sometimes improve while you're holding the antenna, and revert back when you let go." So it depends on how Audi engineered the key fob.

[Phenotis]

[QUOTE=Alabama;14451124]

I'm not sure that's quite correct. I believe the matter has more to do both with skin capacitance and with radio frequency and antenna design. From an internet discussion pointing out the matter of radio frequency (not key fobs): "Your body can act as an antenna, but definitely not in this case. For a 60Hz signal, the value of λ/2 is 2500 km, so your body has not nearly the right size to act as one. You have picked the mains wave via the capacitance between your body and the electric wires. Things change in VHF/UHF range, where your body can actually convert an electromagnetic wave to a signal. In analog TV era, this phenomenon could be easily seen when tuning the "rabbit ears" dipole antenna: the reception quality would sometimes improve while you're holding the antenna, and revert back when you let go." So it depends on how Audi engineered the key fob.

Can't seem to find the original article but I could have sworn there was a white paper on it. Here's what I found online though: https://www.nydailynews.com/life-sty...icle-1.2020983

It's either due to the fluid and the particles within the fluid acting as an electromagnetic booster, or it's the cavity of your head creating resonance. Dunno, but I know it works because I've done it a few times in large parking lots when I lost my car haha.

[trmills]

[QUOTE=Phenotis;14450890]

There's actually physics behind it. The fluid in your head, namely in the meninges between your brain and skull act as an antenna of sorts, increasing the signal strength of any radio device.

There's actual scientific documentation somewhere (I forget where but it's definitely on the internet) where some scientists actually tested and verified it.

That's actually what I read!

[WatchMeSpend]

I hold mine to my GFs head. She thought is was cute until she found out what I was doing.

[Alabama]

[QUOTE=Phenotis;14451180]

Can't seem to find the original article but I could have sworn there was a white paper on it. Here's what I found online though: https://www.nydailynews.com/life-sty...icle-1.2020983

Who knows, but this is not consistent with what smart people in the amateur radio world taught me. Further, the human body is mostly water; nothing special about the head. Maybe that's why the guy being interviewed is retired!

[markdjr]

Back to the OP, is there an adaptation that can be made via VCDS to increase remote range?

[Alabama]

Back to the OP, is there an adaptation that can be made via VCDS to increase remote range?

I don't think so although post #2 gives a suggestion. It's not in the "VCDS Tweaks" document. I believe I read on another thread that Audi does not include it for security reasons; the key (and owner) need to be fairly close to the car to unlock it. That's why there are threads discussing aftermarket devices to accomplish this. OP might want to ask within one of the VCDS threads. The answer might also vary between US and Europe market cars (OP is in Sweden).

[getmp3s]

I've used the "key fob under the chin trick" to extend the range. Works pretty well.

Check here I think this was listed for a Q7, but might be similar, but I would change anything without recording everything first.

Address 46: Central Conv.

Byte 28

I personally would enable all these options as after extensive testing I found that enabling the range limitations actually allows the keyfob to perform additional functions when you hold the buttons down for 0.8 seconds. If range limitations are removed then you can no longer hold the fob buttons down to do the following:

Bit 1 Range Limitation Lock = IF ENABLED THEN YOU CAN HOLD FOB LOCK BUTTON DOWN TO RAISE THE WINDOWS AND CLOSE SUNROOF
Bit 2 Range Limitation Rear = IF ENABLED THEN YOU CAN HOLD FOB UNLOCK BUTTON DOWN TO OPEN AND CLOSE THE TRUNK LIFTGATE
Bit 3 Range Limitation Opening = IF ENABLED THEN YOU CAN HOLD FOB UNLOCK BUTTON DOWN TO LOWER WINDOWS AND OPEN SUNROOF
Bit 4 Range Limitation Panic = DIDNT TEST THIS SINCE I NEVER PANIC