ERR Found this after much serching..... Seem for antitheft reasons they are locked to a cars vin...
http://www.mercedestechstore.com/pdfs/ml files/handouts/316 HO AAM, Key replacement 98-99.pdf
Replacing the AAM
ι Every replacement of All-Activity-Module
requires that a new VIN-specific master key
also be ordered (163 760 27 06).
ι All customer keys must be present to properly
install and test the replacement AAM.
ι The original reserve key (key #1) must be
destroyed after the replacement AAM has
been installed and function tested. The
ordered key is given to the customer.
AAM Replacement Procedure
1. Use the above guidelines (and table) to
determine if AAM version is compatible with
Immobilizer level.
2. Read-in data from old AAM and transfer it to
the new part.
3. Using the supplied master key, program
codes for all eight keys to the AAM through
the “learn transponders” menu in Star
Diagnosis.
ι After transponder codes are learned, the
master key will retain only the #1 key
transponder code and becomes a
reserve key.
4. Learn all RF transmitters to the AAM using
the “Learn RF” menu.
ι Do not use this function to relearn RF
transmitter key already in use if
synchronization has been lost.
5. Check correct function of all transponders
and RF keys.
6. Assure for proper version coding of the
AAM. See Job Aid 54-01.
7. Check all vehicle functions controlled by the
AAM.
ι Until transponders are locked, the AAM
and master key can be left in its original
status through the “Create single use master
key again” menu in Star Diagnosis.
8. Lock transponder codes.
ι This procedure permanently locks the AAM
control unit to vehicle and keys. If this
step is omitted, the AAM will lock
automatically after 30 engine starts.
Replacing/Resynchronizing Vehicle Key
ι All vehicles are delivered with reserve key #1
and RF transmitter keys #2 and #3.
ι Spare keys #4 through #8 can be ordered as a
flat key or RF transmitter.
ι No two keys can have the same number.
ι Each new RF transmitter key must be
individually learned by the AAM with the Star
Diagnosis the first time they are put into
service.
ι Learning is achieved through the “Learn RF
key” menu.
- Follow On-Screen directions.
- Learning is time limited to 10 seconds, but
can
be repeated until proper learning is
achieved.
ι Synchronization of a transmitter already in use
is done without Star Diagnosis.
Resynchronizing the Vehicle Key Procedure
To resynchronize a RF key, do as follows:
1. Insert RF key into ignition and turn to
position 2.
2. Remove key and hold down lock button
while pushing unlock button five times.
3. Release all buttons, then push either lock or
unlock button.
ι Procedure must be completed within10
