Electrics: - Ring Antenna Question

glengibson · May 12th, 2020, 21:54

Hello!

Can anyone tell me if the the ring antenna around the ignition has any effect on the central locking/unlocking with he keyfob if faulty?
or does this antenna only pair up with the transponder inside the key fob?

both my key fobs (had 2 sets of batteries in both now) sometimes dont open/close the central locking. need several attempts and maybe a little tp of the fob on something solid

thanks all !

SwissXC90 · May 12th, 2020, 22:27

No.

The key fob send lock/unlock signals to the remote control receiver in the UEM (upper electronics module), located inside the interior rear view mirror.

The ring antenna around the ignition lock is for the passive immobiliser transponder inside the key, and has nothing whatsoever to do with the keyfob buttons.

Harley Dave · May 13th, 2020, 00:58

I had problems with my fob for remote lock/unlocking.

Fresh batteries didnt make any difference, sometimes the fob worked sometimes not.

Turned out to be that the batteries weren't making a good contact inside the fob, the little spring contact had weakened slightly.

This was a couple of years ago and the fix (packing out with a bit of foam) has lasted until now (kiss of death I know...)

Edit - was actually 3 years ago and the whole story is here

https://www.volvoforums.org.uk/showt...=264241&page=2

Cheers

Dave

May 12th, 2020, 21:54	#1
glengibson Member Last Online: Apr 16th, 2024 22:36 Join Date: Jan 2008 Location: Hull	Ring Antenna Question Hello! Can anyone tell me if the the ring antenna around the ignition has any effect on the central locking/unlocking with he keyfob if faulty? or does this antenna only pair up with the transponder inside the key fob? both my key fobs (had 2 sets of batteries in both now) sometimes dont open/close the central locking. need several attempts and maybe a little tp of the fob on something solid thanks all !

May 12th, 2020, 22:27	#2
SwissXC90 Premier Member Last Online: Mar 20th, 2024 18:26 Join Date: Jan 2016 Location: Cross Country	No. The key fob send lock/unlock signals to the remote control receiver in the UEM (upper electronics module), located inside the interior rear view mirror. The ring antenna around the ignition lock is for the passive immobiliser transponder inside the key, and has nothing whatsoever to do with the keyfob buttons. __________________ XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.

May 13th, 2020, 00:58	#3
Harley Dave Volvo Driver Last Online: Today 22:17 Join Date: Mar 2016 Location: Basingstoke	I had problems with my fob for remote lock/unlocking. Fresh batteries didnt make any difference, sometimes the fob worked sometimes not. Turned out to be that the batteries weren't making a good contact inside the fob, the little spring contact had weakened slightly. This was a couple of years ago and the fix (packing out with a bit of foam) has lasted until now (kiss of death I know...) Edit - was actually 3 years ago and the whole story is here https://www.volvoforums.org.uk/showt...=264241&page=2 Cheers Dave Last edited by Harley Dave; May 13th, 2020 at 01:13.

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