Check the fuses to the CSM ( Central Security Module ) .
CJB ( aka Central Junction Box, cab fuse panel ) Fuse # 15 & 29
15 is the BPP ( Brake Pedal Position ) Switch, so that should be fine, unless you cannot get the truck out of park while running and the brake lamps don't work.
29 is the fuse to the CSM ( hot in start or run key positions ).
BJB ( aka Battery Junction Box, Engine Compartment fuse panel ) Fuse # 115 or 8. 115 is for the Supercrew body style and 8 is for the standard cab & SuperCab configuration.
This is for a build date after 2-OCT-2000 ( 2001 MY ).
Build date before 2-OCT-2000, the CSM is a RAP ( Remote Anti-theft Personality ), looks the same, same functions, but is not pin for pin compatible.
Fuses for this are CJB Fuse #8 and 15 and BJB Fuse #4.
With the CSM / RAP installed, the power door locks are controlled by the CSM/RAP, without the RKE ( Remote Keyless Entry ) installed, they are normal power door locks ( switch to the door lock direct ).
Worth a start checking the CSM / RAP fuse
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