St-21se1 diagram - Cars & Trucks

1. Locate the relay panel: The relay panel is usually located near the battery and is often marked with a diagram of the various relays.
2. Identify the starter relay: The starter relay is typically marked with an "S" or "ST" on the panel or cover.
3. Check the wiring diagram: If you're having trouble locating the starter relay, refer to the vehicle's wiring diagram for help.

If you're still unable to locate the starter relay, it's recommended to consult a repair manual

I have a site that may have the manual you are looking for.

https://www.manualslib.com/

Probably a bad input signal to the module that controls the lock & unlock , central locking system is controlled by smart entrance control unit .
You can watch this video , is an american vehicle with switch input to the BCM - electronic control unit .
Door Locks Go Crazy 1
Door Locks Go Crazy 2
Door Locks Go Crazy 3

Finding a repair manual an looking at wiring diagrams for the lock circuit an looking to see what all is involed an testing like the guy in the video .

b= body
ig= ignition
st= stereo ?
d/l= door locks ?
wip= wipers
s/htr= seat heater ?

It is under the hood on the driver's side in what Toyota calls Engine Room J/B No.2.

Here is a diagram that shows you the location of the jumper block


Look at this diagram of J/B No. 2. The relay labeled ST relay is the starter relay...

can you check with parts department at ford and see if thy can
otherwisw check with autozone

http://images.google.com/images?q=2006+ford+focus+fuse+diagram&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&sa=X&oi=image_result_group&resnum=1&ct=title

You can google it easily.
Or
www.autozone.com

Check the wiring diagram and ignition timing diagrams found in the 83-88 T-Bird/Cougar Haynes manual.