164 electronic door lock

[Alfisto@domain.elided]

What distance from the car (164s) does the average door lock open and close 
when activating the key sending unit ? I have to place mine next to the 
driver's side window and pointing towards the receiver in the interior light 
housing, for the locks to activate and even then it frequently does not work. 
I have replaced the batteries, cleaned all inner terminals and placed 
supports under the circuit board so it does not slip out of its mounts (which 
it frequently does). Can these key sending units be replaced or renewed?
Graham Arlen 
94 164LS

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