Never started a c7 ignition.. I see there is a start button of course, do you use the fob supplied insert area where there is a coventional key slot to
activate start button? sorry if basic but not been inside a c7. Well not exactly true last summer asked the new car dealer to start the c7 it would
not start, and forgot to see if key fob was used.
Kind of like to at least know how they start. thanks

 

No, everything is keyless, except you need the supplied key to open the rear hatch in an emergency like battery dead.

 

ok thanks

 

IF the FOB battery is dead and you used a key to get in, you can put the FOB in the slot in the steering column to start the car to go to the store and buy a battery!

Elmer

 

For some reason thought I saw a vidio where they put the fob part or something in the colum?may been to reset something.

If you never seen a c7 up close I fail to see the humor of sarcasm.

btw when a fob battery is changed does any of the code info change, I assume not, probably costly to reset.

 

When you change FOB battery, everything stays the same.

You put your FOB in the steering column to allow the car to start when the battery is dead in the FOB. It just sits on a little shelf the size of the FOB.

 

Thanks

 

I think I have heard people on here say that it's a good idea to replace the fob batteries every 2 years to be safe, does that sound about right?

 

IN the column was for a FOB with a dead battery, it'll let the car start.

Sorry, I'm confused on the sarcasm statement??

FOB batteries change the battery, nothing to affect any settings for the FOB.

Elmer

 

My mistake miss understood, thank you for the help

 

To expand on the system, the FOB is basically the token in a radio frequency identification (RFID) system but powered to increase range.

The battery in the FOB powers the receiver/transmitter in the FOB. The car is sending out interrogation signals and when the FOB is in range, it receives these signals and transmits a response to authenticate. What the FOB is basically doing is listening and when prompted, sends it's code back to the car to authenticate.

When the battery in the FOB is dead, it can't listen or obviously transmit back the authentication. The fail-safe for a dead FOB battery is to place the RFID "chip" in close proximity to the fail-safe authentication transceiver (in the steering column of the C7, glove box on the C6) so the car can directly interrogate the RFID "chip" in the FOB without the need of the powered transmitter in the FOB. Yes the C7 uses multiple transceivers in normal mode (working FOB battery) but close proximity is needed for a direct read (dead battery FOB battery) of the RFID code and why you have to physically put the FOB in the fail-safe slot.

The same basic system is used with RFID swipe cards with building security systems. This is a simplification of the process but same principal. The car starts with a dead FOB because it is in direct proximity with an interrogation system sensor so the FOB doesn't require power to respond and is a fail-safe...


Allen

 

It may die tomorrow and have nothing to do with the C7, but the one I use for my '01 is still the original. It will no longer work from the far edge of the theater parking lot (where I always park) like it used to but it does still work within normal distances. I'd be shocked if my C7 lasts half that long from what I read.

 

Avanti: Both of my FOB batteries (one of them rarely used) died at just over 3 years (no warning either). The primary FOB I had to key slot to start car. The secondary FOB worked intermittently but only from 3 or 4 feet away. Put in new batteries -- all is good.

 

I have the A6 AND a convertible. Remote starting of the car requires a couple of button pushes and I'm sure that hastens the loss of battery life. BUT!!! The killer for us with a convertible is to put the top down with the remote. That requires a constant press of the top down button on the FOB for the entire time it takes for the top to go down. Definitely a FOB battery killer. I've eliminated a lot of battery drain by installing the SmartTop. I hold the unlock button for 4 seconds and the top AND windows go down without having to hold the FOB button for the entire time. SmartTop also allows me to put the top and windows up with the FOB by holding the lock button for 4 seconds. Great little gadget for us convertible folks!

Elmer

 

Just leave it in your pocket.