No crank no start battery good

check --clean and test battery and connections --------

no info generic answer either fully remove aftermarket unit or notify company for assistance in troubleshooting unit

If the battery is old, (More than five years old), it would be a good idea to replace the battery anyway. Old batteries can still hold a full charge but when you put them under load they can be too weak to turn the starter motor. It generally takes 9v to actually turn the starter motor.
What exactly do you get when you turn the key? Do you get nothing at all, a lazy cranking effort, a single 'Click'? Getting nothing or a lazy effort suggests a bad battery. A single 'Click' suggests it could be the actual starter motor causing the issue.

That sounds like the security system.

https://www.google.com/search?q=2003+toyota+tundra+security+system+reset

https://www.fixya.com/cars/t27109176-reset_anti_theft_device_2003_toyota

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Before you spend a penny on it try jumping from a good vehicle. Does it turn as expected? Yes? Then check your battery.
No, then check the leads and ground cable to the battery and chassis.
At that mileage I'd expect the starter to be on the way out. Its drawing heavily on the battery because its worn inside. Hence the poor cranking speed. Don't worry about plugs belts etc until you have sorted the starting part. Get a good home mech to help.

that is because it is dead?
that key dead thing is called NO CRANK, not no start.
no car starts unless cranked, or push started or gravity started,
so its a NO Crank issue,
and the stalls, well if the battery drops below 10v the EFI system
stop working just like your lap top does, or CEL phone
and for same reasons.

most folks do a jumper cable crank next. like the AAA tow truck man does first, and for good reasons.
this proves what is wrong,
1: battery was dead (car cranks now)
2: starter dead. or key line dead, if not. cranking now.

my guess is its #1

if battery was dead, then it is

• bad battery.
• only discharged, so why not charge it?
• or phantom drains, (over night parking battery dies)
• or alternator is dead, (chargelight glowing? test alt.

I saw something similar to this on a 1991 dodge van a few days ago.. turns out it was the battery. It was odd, because it cranked over fine and had spark and fuel, but would not start. If your battery is good, then confirm that your fuel pressure is ok

turn the igntion on, don't start, let it set for ten minutes Turn it off for 5 seconds then try to start it. If it lost memory for some reason and doesn't start . then do this three times , after the third time start it. that is the relearn procedure. Have a charger on it for the 30 minute relearn. Relearn is on for ten m off five s on ten off five on ten off five then start

Honestly, that sounds bad-loud knocking that gets worse, then no start-does it sound normal when it cranks? Does it crank freely? Is your battery in good condition? More information is needed...

your battery isnt holding enough charge to crank the starter.thats what the clicking is. try charging you battery for a good 8-10 hours, if it still does the same thing you'll need a new battery.