Check for a Service Bulletin on that - I had the exact same problem with my '98 Dodge/Cummins & it's the voltage going to the unit which controls the lock/unlock function. At the time nobody knew what it was (not even the factory engineers) but they finally came out with a S.B. On it & the voltage has to be exact - if I remember right, if it fluctuates more than 1.2 Volts, the lock/unlock function won't work right.
Also, buy yourself a battery teminal cleaning brush & a pack of those red/green felt gaskets to put on the battery teminals before you install the cables - yes, they really do work. You will still get some white, dusty corrosion on the negative terminals over time, but it takes a LOT longer to develop & it you brush it off when it starts to form, you'll be fine. Oh - don't let the dust get on your clothes, or there will be holes in them after the next wash (don't ask me how I know).
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Friday, September 18th, 2009 AT 2:16 PM