Random "No Function" of key fob or Driver Door controls

[rcmedic]

It is driving me crazy!!! Completely random events where the key fob fails to function at all but the alarm remains active with no way to get into the truck without setting it off before entering and putting fob in the slot and turning it to any position other than off. When this occurs the driver door armrest buttons for door locks and windows also fails to function. Manually starting the truck will return function to the key fob but the door controls function does not return until shifting into gear. I admit that I am clueless. I don't even know where to begin trouble shooting. I have used AlphaOBD to check settings with nothing appearing to be inappropriate nor are there any OBD trouble codes or check engine light on. This occurs randomly and is not specific to any location.



The following explains what happens, when it happens: Park truck, exit, and use fob to lock. Come back (irrespective of time lapse) & attempt unlock with fob. No response of any kind. If parked overnight, neither does remote start function work. Use key in fob to unlock door. Simultaneous with opening the door, alarm goes off (loud air horns). Rush to get fob into ignition and turn it at least to accessory position to quiet alarm. Purely a fluke that I noted that driver door control buttons also fail to function during these events until the truck has been shifted into any gear.



I am open to suggestions and ideas.

 

[Topzide]

How old is the Fob battery and then how old are truck batteries? Not sure if alarm has anything to do with inop door buttons but could since our trucks use a network between modules. Maybe a truck reboot is needed. Ours may have more insight.

 

[rcmedic]

How old is the Fob battery and then how old are truck batteries? Not sure if alarm has anything to do with inop door buttons but could since our trucks use a network between modules. Maybe a truck reboot is needed. Ours may have more insight.

Fob batteries are brand new. Truck batteries are very good ( i keep mine on a battery tender when not in use at home).

 

[p-Bar]

try your other fob

 

[rcmedic]

try your other fob

Have 3 fobs. Same behavior for all three.

 

[brucejohnson]

So the driver's door switch functions are inop when the issue arises. How about the passenger door switches? With all the BUSS logic involved it almost seems like a sensor/switch/program has an issue with determining mode, logic tree status. Nothing indicated on AlphaOBD, error messages when the error is active?
What year, trim level/model and options? Does it have the Remote Start feature?
Sounds like the security circuit/module may be playing with you...corrupt program?
Check - push/wiggle fuses; wiggle connectors; can you reset any related system to factory settings. Maybe disconnect power for several minutes.
Might be easier/quicker to make a trip to the dealer for a WiTech session...