E53 key programming - strange problem

[Clockwork]

Originally Posted by andrewwynn

What your described is exactly how it is designed to work. You cannot "add on a key" you reprogram all keys at once. Any time you need to replace a key you need every key at the same time and the car forgets any old keys and learns them all fresh.

Re do what you did with all keys and you'll have them all working.

sensational.
thank you!!! Will re-program ALL at same time tonight.

[andrewwynn]

The 2nd and 3rd extremely easy to add on. I made the same goof when I got my second key

[Clockwork]

all fixed. super glad. cheers again

Sent from my Nexus 9 using Tapatalk

[Qsilver7]

The reason you need all of your remote keys during a programming session is...this procedure initiates communication with the GM (the control module for FZV/DWA...central locking & anti-theft alarm siren system)...when a key is initialized...the GM assigns a key code & new rolling code table....any remote key not programmed during this session will not have the new info...so the GM will not recognize it for lock/unlock & arm/disarm of the vehicle over the RF frequency the key is sending the data over (315MHz in USA/Canada...433MHz in Europe/Austrailia/other markets).

I'm glad, too that the info about the remote keys was corrected. Yes indeed, there are multiple systems in the remote keys. It contains EWS (self powering) transponder, FZV (central locking) & DWA (anti-theft alarm siren system) which both use the battery inside the key to power its transmission.