[V8] Door locks

[Coleman, David]

Ed and I have been discussing our V8's power unlock mechanism.

Specifically, my car unlocks only the driver's door with a quick twist of the key, and will unlock all remaining locks if I twist and hold for a moment or two.   But other '91s don't have the driver's-only capability -- the only option is to hold the key for all locks open.

Mine is a later model '91 (April '91?) and the VIN ends in 2319.  There is a definite sense of cylinder action happening, while on both Ed's and my friend's earlier (12/90) '91 model that don't have the quick-twist function, the key action is more vague.

Are these malfunctions, or is this a feature that found its way into later models?

-DaveC.