S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

How do I program my key remote?

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Old 01-02-2004, 07:27 PM
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How do I program my key remote?

I have a 96 S class and need to program my key after getting a new battery. How is this done?
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Brad Christy (08-28-2020)
Old 01-05-2004, 11:50 AM
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CLK, ML320, 400E, 400SE
1 Point window in remote control key at a receiver.

2 Press button momentarily.

3 Lock or unlock vehicle within next 30 seconds with folding key in remote control key in lock cylinder. The remote control should once again be operational.
Old 01-05-2004, 11:59 AM
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Originally posted by rsmcmahon
1 Point window in remote control key at a receiver.

2 Press button momentarily.

3 Lock or unlock vehicle within next 30 seconds with folding key in remote control key in lock cylinder. The remote control should once again be operational.
I changed my key battery, but since then the little red light within the key stopped blinking. Is this normal or should the red light must blink no matter if the key is sync'ed or not?

Thanks
Old 01-05-2004, 12:10 PM
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CLK, ML320, 400E, 400SE
Push button for at least 1 second. Batteries are in order if diode in outlet window lights briefly.
Old 01-05-2004, 12:17 PM
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it dosent. i think my key is fried.

Last edited by ///S320; 01-05-2004 at 01:03 PM.
Old 01-05-2004, 12:48 PM
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Originally posted by rsmcmahon
1 Point window in remote control key at a receiver.

2 Press button momentarily.

3 Lock or unlock vehicle within next 30 seconds with folding key in remote control key in lock cylinder. The remote control should once again be operational.

Thanks, it worked!
Old 01-19-2004, 11:14 AM
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S420
Can I use the same method to program the key for 94' S420? Thanks

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