If both key and knob stopped working, the fault is more likely to be in the wiring, because those are separate switches. One place the wiring dies is in the door jamb, right where you had to fish the new wires for the driver's door actuator. The copper can be broken inside the insulation from being flexed for years. If both lock and unlock functions got lost, it is probably the black (ground) wire.
I've installed a half-dozen JC Whitney keyless products in 240s. The cheapest of the cheap - most of them were $30 IC Dynamics.

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Art Benstein near Baltimore
How is it that we put man on the moon before we figured out it would be a good idea to put wheels on luggage?
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