Date registered: Dec 2002
Vehicle: 92 500SEL to 01 E320T current 2014 lexus LS460
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My 01 E came with two smart keys and one emergency key (the emergency is very slim, has no remote function, has a steel key and will start the car).
In the code scheme there are three rows of eight numbers. The shipping keys come out of row one, and assume the first three slots. The additional keys go four thru eight. Repacement keys would occupy the second row, so number one, row one, would become row two #1, and invalidate the first forever. The second replacement for the first would go to row #3.
There can never be more than 24 keys assigned to a car before the computer has to be replaced and a learning key ordered from MB.
I got quite an education when one of my remotes broke and parts ordered the wrong one, the replacement voided my good one and the bad one was returned to parts on a warranty basis. It seems it can take up to 45 minutes for a replacement to code itself and invalidate its counterpart, it will first turn in the ignition but the car will not keep running untill it registers.
The shop can remove remotes from the computer if you have concerns, but they will be forever removed even if you find your lost one.
The magic thinking is you can have up to eight remotes, but they can only be replaced twice, there is where the 24 comes from.
So it is a, replacement, or additional, the MB PDC keeps a log by vehicle.
The remote function is handled by both infra red, and radio frequency to lock and unlock a cars (doors/trunk) and panic, and is powered by batteries in the remote. The ignition unlock and start are controlled by inductive energy transferred to the key by the key collar and handled thru a redundant data line to the ESL module which unlocks, and keeps the steering wheel unlocked, a power failure would not lock the wheel, which could be a real problem going down the road.
Last edited by Peter Guenther; 04-03-2008 at 02:40 PM.