UPDATE:
I installed the Sylvania ZEVO 921 LED bulbs in the cargo light fixture.
Unfortunately, the problem of "lock-unlock-lock" remote start sequence freezing at the "unlock" phase still remains.

While it is better with the ZEVOs, it still greatly reduces the range of the remote start feature as compared to stock bulbs.

Results:

• With the LASFIT LED bulbs, I had to be standing literally right next to the truck to get the "lock-unlock-lock" remote start sequence to complete.
• With the Sylvania ZEVO LED bulbs, I could be standing up to about 10 feet away, but any further than that would often get stuck in the 'unlock' phase.
• With the standard incandescent bulbs, I can be easily 30-40 feet away and still be successful, with NO instances of stalling in the "unlock" phase ever.

Oh well. I love the remote start feature and use it all the time, so I can live with the incandescent cargo light bulbs.

Regardless -- thanks to all for the suggestions!

 

Still weird, I have the OEM lock-unlock-lock remote start and have ZEVO 194 in the cargo light housing and can start mine from 200 yards away. I thought in post 16 you said you fixed it? What brand of remote start do you have?

 

I did fix it in post #16 -- by putting the stock incandescent cargo light bulbs back in. Fixed 100%.

In my last post (#21), I tried again but with a different brand of LED bulb (ZEVO) as suggested by other members, but the same "unlock freeze" problem returned, just not quite as severe as with the LASFIT bulbs.

I have the Ford Accessory kit "Ford Security System with Remote Start", part number "KN1Z-19A361-A"

 

Gotcha, well that stinks, but I would rather have an operational remote start than led cargo bulbs. Hope some help comes along for you.

 

Totally agree. Not going to put any more effort into other LED bulbs for the cargo lights.

 

POSTSCRIPT to my Cargo Light/Remote Start problem:

I've decided I'm just going to replace the OE "912" incandescent cargo light bulbs with size "921" incandescent bulbs.
The 921's should be a little brighter, as they have a little higher wattage (921 is 17watt vs. 12watt for the 912's) and are the same socket and overall size.

True, they are not as bright as LED, but will have none of the fob interference of LED's I experienced either, and it will be at least a little better than stock, not to mention super cheap ($6) and easy to find.

 

Sorry you have that issue.
I have a 2018 5L and just replaced them with LED lamps from Auto Zone and have no problem with remote starts.
They are much brighter than the stock incandescent.
Good luck.
I

 

Thanks.

Just for my own info -- do you have the remote start from the factory (fob has a "engine start" button on it)? One of my working theories is that since the F150 remote (with remote start button) operates on a different frequency than the trucks that came from the factory without it, perhaps that frequency is less subject to the interference thrown by the cargo LEDs? Again, just one of my theories -- no data to back that up yet.

 

Lock button operated first, then double push on start button.
Watch the lights on the Fob.
Single green flash is a perfect short crank start.
Double green flash is a longer crank time.
Green, and Red still starts.
Red flashing can be a start failure.
I don't know all the reasons for the different flashes and colors.
The doors cannot be unlocked for at least 30 seconds of run time, or the motor shuts off.
I think this last action may have something to so the theft deterrence.
Also, if the hood is unlatched, the remote will not function because if someone is working in the engine bay and the remote is activated, the person may be injured. This is in the user manual.
When doing the lock only, the parking lights will flash on.
When remote start functions, the park lamps will very in intensity.
As seen from a distance so you can tell what the result was.
Also putting the fob under the chin area and doing a remote start seems to increase the distance for remote starting.
The Fob is a transceiver sending signals and receiving a return signal to operate the Fob signal lamps.
Good luck.

 

Thanks for the info. Since you have a "start" button on your fob, you have the factory-installed remote start (which is a different frequency), or perhaps an aftermarket that uses a totally different fob system (and frequency). Either way it's a different frequency than the non-remote start factory fob. And if it IS aftermarket, the receiver is in a different location too, further insulating it from the cargo light fixture.

Thanks again!