Mercedes Key Reprogramming

These instructions are applicable to the flip type rectangular keys – the "bladeless keys" can only be reprogrammed using diagnostic equipment & can NOT be used on any vehicle other than the one that it was supplied with.
A CLASS
Procedure
1. Point the key at the vehicle & press the lock/unlock button twice.
2. Turn the ignition switch to position II within 30 seconds.
C CLASS (1993-1997), E CLASS (1995-1997), SLK (1996-)
Procedure
1. Point the remote control at the receiver – this should be located in the driver’s door handle or next to the boot lock button.
2. Press the lock/unlock button.
3. Within 30 seconds manually lock or unlock the vehicle using the passenger’s door lock or the boot lock.
Alternative method
Procedure
1. Point the remote control at the receiver – this should be located in the driver’s door handle or next to the boot lock button.
2. Press the lock/unlock button.
3. Within 30 seconds, switch the ignition ON.
Alternative method
Procedure
1. Point the remote control at the receiver – this should be located in the driver’s door handle or next to the boot lock button.
2. Press the lock/unlock button.
3. Within 30 seconds, turn the ignition switch to position II.
M CLASS
Procedure
1.Turn the key to position 2 in the ignition lock. Then turn the key to position 0 in the ignition lock & remove.
2. Within 60 seconds, press & hold the LOCK button.
3. While holding the LOCK button, press the UNLOCK button 5 times.
4. Check all functions.
5. If it still does not operate correctly, repeat the procedure.

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