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I did this. It is very easy to do! Follow This: (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Paul G. on August 03, 2001 at 09:07:56:

In Reply to: Keyless entry/alarm question: Is my car prewired posted by frybear on August 03, 2001 at 08:40:07:

1.) Go to and get a generic keyless entry system for like 40 bucks.
2.) Go to audio excetra and get a wiring harness for keyless entry. They will say they have one for a 92 but not a 91. Thats ok. that one will work.
3.) Once you get it. Pull the rear seat up. Connect in the harness with the diagram it comes with. (match wire colors.
4.) Now you will have open wires that you can connect to the alarm you got from harborfreight.

I just connected the keyless entry. and siren. I didnt make a connection to the horn. I didnt want the horn to blow everytime I unlock my car.

Piece of cake.

If you need further direction email me.

1991 535i

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