I have 98 f150 with security remote start remote got wet will not work how can I start truck without remote

No scanning the PCM first is huge problem I bet it is angry with DTC errors from PAT, GEM, PCM and even the cluster.
Obviously the key immoblizer is failing hard,
Passive Anti-Theft System (PATS) is failing and or things in its path to starting and running or just cracking you did not say.

no REMOTE START option checkl
yes F150 yes.

water leaks to the BCM can do that, if the BCM computer gets wet any thing can happen with any computer wet.
well fix the leak then remove the wet computer and put it in an attic for all day long. , its still hot here in texas. are you in a hot zone?
there is no modern cars that like water in the cab, this will never be good. unless it is dried out fully. fully dry a good temp is 120F
like in the desert hot. (cars inside hit 180f to 200f easy. )

got 4wd?
what PU is it>? I have vast experience as ET electronics tech even in a factory and endless failures seen of endless kinds.
for sure wet. . or worse lightning hits.
is driver on left side of car LHD, Bingo

i WILL ANSWER for only USA cars. ok?

F150

I am reading your service manual online now.
under locations.
left side cab dash shows the GEM module others call BCM.

a huge starter relay yes
the transmission in PARK or N, sends start to starter relay.
for a fact the car gets start and run, even,

even cluster wet can not communicate IMMO key is good or bad
or lies. PATS must work right to allow cranking if PATs lies ,oops or cluster brain is wet and things PATS likes a missing key go figure.

the only question is who got wet.
in shop they may put you in the poor hows slamming in lots of computer models.
I'd dry them out .

Pat model (key) sends data directly to the cluster CPU
the cluster brain has power at all times. that is how the key works.(is a kind sleep mode key out)
and if the cluster brain gets wet anything can happen.
the cluster display only glows keyon , so the above is why it is not really fully dead. for PATS to wake it up full.
I guess a wet cluster could even wake it self up.?

id say cluster got wet (or gem)
and even lies to the PCM/GEM both,
all these parts are married, so wild swaps can not work (due hard rules of marriage I call this)
as in they must be programmed to like each other or go dead they do.
watch out some cars sees hacking 7 times it bricks the PCM, not sure here. me.

getting them all dry is best, avoiding tow to dealer.
I see a case for drying them all if 7 time brick rule is true?. take them all out and bake them dry is safe path,IMO


https://imgur.com/a/qJ6fJKR

https://www.manualslib.com/9/98+ford+f150+owners+manual.html


Results for 98 ford f150 var myCallback function document ready function...

you push the ******(star)******* to start it .if it is not starting but starts with a key either wires have come off of remote starter or the remote starter has gone bad.

bad ground

may hav bad motors or switch---------distributer cap cud be wet or moisture in other parts of ignition------getta repair manual for that model

There is no way to disable the immobilizer ( that would defeat the purpose of it ), the question I have, do you have another RFID tag on the ring with the truck key ( speed pass, another Ford key, etc ) ?

If you have these on the same ring, and they are too close to the key cylinder, it can cause a false negative for the programmed keys.

Have you tried another key ?

Are there any other modifications to the truck ( remote start, or security system ) ?

Did you install the security bypass unit as well??

prob. the heater core located under the dash the lines go thru the firewall to the engine. on a '98 you gotta take alot of stuff off to get to it air bag, dash etc. alot of time but the parts arent too much $$

Make sure the key is good. If you have two keys try the other one and see if it starts. For some reason the computer is not reading the chip in the key. The keys might need to be reprogrammed.

Coil or pick up module??