[scheherazade]

So, since the key fob stores data such as codes, etc...

Can anyone explain the relationship between :
1) data stored on the DME (read by the dealer via OBD)
2) data stored on the fob (read by the dealer fob reader)

I assume that the key has to be in the ignition to clear codes stored on the FOB while clearing codes in the DME... (duh)

-scheherazade

[bolty]

And how does this relate to cars with CA?? Do the keys on CA equipped cars transfer data wirelessly??

I have never inserted my key into the ignition ever since I've had the car.

[2kaccordocoupe]

The fob only stoes the data that shows up in the check control / maintenace section and does not include any engine codes... they still need to read that directly from the car.

Stuff like current mileage, fuel consumption, intervals and mileage to the next service etc are only on the fob.

[2kaccordocoupe]

Originally Posted by bolty

And how does this relate to cars with CA?? Do the keys on CA equipped cars transfer data wirelessly??

I have never inserted my key into the ignition ever since I've had the car.

With CA the fob only gets data when you plug it into the car. So say when you go in for service, the SA will go out to the car and plug in the fob to the car and drive it into the bay. Thats when the data is sent to the fob.

[shifterboy45]

Originally Posted by scheherazade

So, since the key fob stores data such as codes, etc...

Can anyone explain the relationship between :
1) data stored on the DME (read by the dealer via OBD)
2) data stored on the fob (read by the dealer fob reader)

I assume that the key has to be in the ignition to clear codes stored on the FOB while clearing codes in the DME... (duh)

-scheherazade

information stored in the key is designed to provide quick information on vehicle status..

the only information that is shared with the DME is the I-level status (current integration level, and the MSD indentifier - current encoding of the unit and the manufacturer.)

the key is designed as a quick check for service level items and their relative proximity to due date.

clearing the systems CBS data will affect the information stored in the key -- which needs to extracted from the CAS and reinitialized.. any other key that is used with information prior to the CBS data update will be refreshed on insertion into the CAS. so make sure you insert both keys in the CAS after code clearing

the key also stores the status codes for the system during the last start up-- if a code exists it will be stored during the check control cycle. if a light bulb is out, check engine light is on, reduced power message, will be stored short term in the key-- if the problem does not exist during the CC cycle - no codes will be stored.

[shifterboy45]

Originally Posted by bolty

And how does this relate to cars with CA?? Do the keys on CA equipped cars transfer data wirelessly??

I have never inserted my key into the ignition ever since I've had the car.

Comfort Access key work the same way -- there is no need to insert the key .. for the record the CA is limited to 2 keys --- whereas only cars can i believe access 3 keys or more.. DWA limit is two keys for CA (anti-theft feature can be modified to disable keys for use-- eg if a key is lost)