just bought a 123 with a non op keyless entry system and interested how this ever turned out and how you did it. I am looking for tips on what might be wrong with my setup

Do I get points for reviving a 12 year old thread?

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I put on my old 124, a keyless entry module I bought from a guy in Australia.

The unit installed in the trunk and it activated he trunk lock. This automatically activated the other doors. It took 20 mins to install, worked great.

Hey I found it:

Home - Mercedes Benz Plug-In Keyless Entry Upgrade

Not sure about the W123 though...

can't help but post this

http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

and

http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/343527-fs-w126-chasis-keyless-remote-%2450-shipped.html

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

I have been using Keyless on my 83 W123 for 6 years. You should see an actuator if you open up the driver door panel. It is used to switch the vacuum switch between the lock and unlock line. The configuration is same as a normal positive trigger to lock and unlock. It would NOT be configured as pneumatic control. Have fun to repair it.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.