i tried that, no luck, no lights are turning on the door handle.
is there another way b/c i see many ways online , there must be a specific one for a 1998 s320
thanks

What is the proper way to open the remote to change the battery?

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1982 300sd (totalled) 1992 300se

That was taken from a 1998 S320 owners manual.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Try pointing the remote at one of the other lock receivers. It's possibly the one you're testing with is bad. Stevebfl's instructions are accurate, because I have used that exact procedure to re-sync the key on my '97 S320.

If it still doesn't work, then I'd say you either have a problem with the transmitter diode in the key or there's a problem with the car's security module.

You can test the key by aiming it a digital camera and pressing the button. The CCD in modern digital cameras can detect the infra-red beam emitted by the key. So if you watch the viewfinder while pressing the button, you will see the LED flicker with a kind of white/purple color.

I'm not sure about how to test the car's module though. I imagine the Star Diagnostic system would probably have a way to do that.

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"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles

im not sure if im doing it correctly.
i pressed the button twice on the outside, then unlocked it with the key, and put the key in the ignition within 30 seconds.
am i doing it wrong?
thanks

You have to turn the ignition on after you insert the key. Don't start the car, just turn it on.

__________________
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles

i did that, but still no lights working on the door, or the keyless entry working