If you have a W124 (or, likely, any other chassis with a vacuum lock system) and want an inexpensive, EASY to install keyless entry, read on!

My wife REALLY missed the keyless entry from our "old" car. We have a '92 300E. I searched the archives for info on keyless entries, and came up with info that Benzmac made a keyless system. However, it seems that they've discontinued this, I'm guessing because of support/installation problems from dummies like me. He suggested that I get one installed locally. I checked them out, and they want to install relays/sensors in the doors, etc.

Anyway, I was ordering a cd player for my truck (for my daughter) from Crutchfields, and I asked them about keyless remote entry systems. They hooked me up with the right equipment, but not necessarily the best instructions... After several calls to the support folks, and hours of dead ends, below are the requirements from Crutchfields and the instructions. Should take a couple of hours, max.

1 - 514REC11 Crime Guard REC-11 69.95
1 - 514DLSV Crime Guard DSVL 3.95
2 - 514AU8 Crime Guard AU8 (relay)(6.95ea) 13.90
Total 87.80

If you order from Crutchfields (800.955.300)and order over $250 from them, you can save $25 by using y customer ID (20011403). I also get $25... hint hint!

OK, here's the process. Believe me when I tell you I went thru hell finding this EXTREMELY simple way to hook this up.

Now, as a caveat, please understand that this ONLY GIVES YOU KEYLESS REMOTE!!! (no starter kill, flashing lights, interior dome light, auto locking doors when ignition is on, etc. that you get if you hook up all of the capabilities of this system).

Remove the back seat bottom (press the two red tabs near the floor and pull up). The vacuum pump is under the rear seat on the right side of the vehicle sheathed in a grey foam block. Carefully gain access to the side of the pump towards the front of the car. You will find 2 wire connectors. Be careful not to disturb the vacuum lines... If yours is like mine, they didn't spare any wire for the pump... One connector is a flat connector with 3 wires. Squeeze the releases on the sides and carefully remove the plug. Remove the other connector, it's round, and the catch on the side has to be flipped up to release it.

On the flat connector, attach the black wire from the control unit and the black wire from the DSLV to the brown ground wire. I like to solder them.
Attach the red (hot) wire from the control unit to the third wire in on the flat connector, it should be red (was on mine, test it with a volt meter, it should show a continuous 12V).

Carefully cut into the sheathing on the round connector. There should be a blue wire in the group. Tap into it with a voltmeter. It should show 12V when the key is turned one direction (locked??), and 0V when it is turned in the other. Carefully cut this wire so that you have room to attach wires to both ends of the cut. The green wire from the DSLV goes to the pump end of this wire, and the white goes to the other cut end. Again, I like to solder connections, and since you are cutting a wire here, heat shrink tubing works well.

Now for the moment of truth. Hook up the two connectors to the pump, connect the DSLV to the control unit, insert the 2 relays into the DSLV, and connect the control unit up. Mash the button and see if it works!!! If it works but not long enough, you can re-program the unit to throw longer (see instructions). Mine worked fine as is.

Assuming all is well, you can also do the following: Take the yellow wire from the control unit and wire it to a cheap on/off switch from Radio Shack, and wire it into the red wire. This is the "ignition" wire, and it's used for the rare times you might need to program the unit. Just flip the switch to program. You can also attach the piazo, the valet switch (for programming), etc. Wrap everything up making sure all is insulated, and tuck everything back into place. Snake the antenna so it's exposed from under the seat. Test again, put the seat bottom back in.

Good luck, email me if you need help (bstreep@satx.rr.com)! Again, thanks to everyone on this site that have helped me out in the past.

Bill Streep
'92 300E
'57 190SL

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)