I've been trying to figure out how the FOB works and how it "recognizes" the car, how the car recognizes it, and how it "energizes" the starting system?? I have no engineering knowledge, but I thought I's throw it at the board as I am sure there are some here that could explain it to me. TIA......

 

O.k. Generaly speaking,

The fob communicates with the RCDLR (remote control door lock receiver) via one of four antennas located on the vehicle. These are located near the end of each door on the rear quarter, at the rear of the vehicle behind the rear fascia and at the glove box.

The communication starts when you do one of the following things, press a button on the fob. Press a door button, press the hatch button or press the start button. At that point the car "wakes" up and transmits a code that only a registered fob will know and respond to. Once the fob receives the signal it sends back a code that only the car will know from a registered fob. Once this communications "handshake" is completed the car will, open the door, open the hatch or start the car. This is why only your fob will work to open or start the car. The id of the fob must be registered and stored with the car. If it isn't registered it will not transmit a code that can be accepted.

The fob is nothing but a security gateway in the process of opening a door or starting the car. It doesn't "do" anything other than say "hey it's me" and as long as that voice is recognized the systems in the car will proceed. The opening and starting of the car are all electro-mechanically initiated and carried out by the car. The fob is literally the electrical equivalent of a key.

The RCDLR uses a rolling code system that indexes after a successful transmission and won't be the same a second time in the sequence. It will revert after "x" cycles.

 

Radio transmitter.

 

Talon 90

On a 09 Vette how do you set the FOB not to lock and unlock the car when you walk away? How do you set it to lock and unlock by pushing the buttons on the FOB?

 

Just go in to the personalization settings on the DIC (drivers information center). You enter them by the options button on your instrument panel.

To have them not lock when you walk away, press the options button and scroll through the menu choices. Press the reset button when you want to select a particular option. Select Passive Door Locking as it comes up and select OFF from the choices with the reset button.

Continue scrolling with the options button until the end of the menu. Now it will only lock if you press the door lock button once open or via the fob lock button.

 

If you do nothing, the car is not set to lock & unlock automatically. Unless the dealer set them without you knowing it, the car does not come from the factory with any that set.

If the dealer has set it, you can "unset" it.

Locking & unlocking by pushing a button on the fob requires no setting.

 

Good point Jim. The default from the factory is passive locking set to off. Some dealers will do it at PDI, others won't.

 

 

...well explained...thx Paul...

 

As I was told by the head honcho of engineering: there are two little men: one in the fob and one in the car each with 2 way radios. When you are within little man radio distance and press the fob buttons the guy in the fob radios the guy in the car and tells him which levers to pull depending on the button you pushed. These guys are not related to the guy in the fridge that turns the light on and off BTW.

 

I wish I had thought of that.

 

On the subject... fob 1 and fob 2 are the different settings for the seat # 1 and # 2 correct?

Also each fob has it's own radio station presets correct? Anything else attached to the fob's?

Thanks,
Shane

 

You are correct on both counts Shane. The vehicle with memory connects the fob and the memory button to several vehicle functions. Other than seat position and as you noted the radio station presets it also includes the last climate control setting, the hud page, the hud brightness level and position, the instrument panel dimming setting and the last display on the DIC.

 

Thanks Talon, I was going to ask about the climate position. When I started the car with either # 1 or # 2 I don't remember but I did notice the climate control would come to 72.

So if I turn the heat or AC OFF after a drive it shouldn't come back on either either key...

Thanks guys,

Shane

 

that explains why mine quit working when i dropped it in the toilet,,,,,,,,, how did it end up in the toilet you ask? thats for another post

 

The rolling code is based off a hash ID which both the FOB and the RCDLM share. This is unique to your car. Chrysler calls it the "Secret Key" I assume GM has similar nomenclature.

 

Paul, you are one smart guy.

 

 

And the steering wheel indent position (not tilt) and the outside mirror settings.

 

Thanks Jim. I worked from memory. I should have looked it up.