Ford Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I'm an independent contractor here at Just Answer.
An alarm going off on a vehicle not running and the doors locked indicates the perimeter anti theft has been triggered. This occurs when the module detects the battery voltage has fluctuated like form a light coming on. The most common reason for this is sticking door ajar switch attached to the door latch in the doors and liftgate. Open those doors and spray the latch pretty good with some penetrating lube like liquid wrench then close the door about 5 times and retest.
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That is correct, there is not a physical test to see what is to blame using a diagnostic tool. This error is not stored.
Unplug th horn and try another fuse. If the fuse does not blow when tying to honk the horn then it is your horn that is internally shorted to ground and faulty.
If the alarm went off for a while the honking horn eventually caused the horn to fail.
The alarm will not go off from a faulty horn.
You have 2 issues now.
What is my recommendation on which concern?
Have tried everything I have mentioned so far?
Did you lube the door jar switches yet?
You may need to wait till the horn is working again to confirm the alarm issue is resolved since with an inoperable horn you will not hear the alarm going off.
Can you lock it up and watch the vehicle and or record it to see if the dome light comes on prior to the alarm?
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