Isuzu Trooper anti-theft alarm

Question edited for clarity, 'fuse', unless you light it 'fuze'.Question moved to sub category.

If the radio has an inline fuse, it will be within 82 of the plug at the rear. They are built into the harness. Unlikely because there are three fuses covering audio.

https://fuse-box.info/isuzu/isuzu-trooper-1992-2002-fuses-and-relays

C11 10 (AUDIO[ACC]) MIRROR Audio, Door mirror, Door mirror control SW, Door mirror folding SW, Digital clock, Speaker C12 20 CIGARETTE Cigarette lighter C13 10 ANTI THEFT Anti-theft controller C14 15 STOP A/T CONT Stoplight SW (w/o cruise control), Brake SW (w/cruise control), Rear wheel anti-lock brake controller, Stoplight, Transmission control module, Electronic brake control module, Trailer harness connector, Cruise control unit, A/T shift lock control unit, Lockup off relay C15 20 AUDIO[BJ] Horn, Horn relay, Horn SW, Hazard warning light SW, Flasher unit, Anti-theft horn, Hazard warning light, Audio C15 20 TELEPHONE Telephone C16 10 CLOCK[B] ROOM Digital clock, Audio, Dome light, Map light, Luggage room light, Courtesy light, Door SW (Front, rear, tail gate), Antenna, Anti-theft controller, Key remind SW, Seat belt, Key & light remind buzzer

You should look for the alarm fuse and relay and replace them.
Is it the factory alarm or what brand?

Could be messy since disabling the alarm may disable your ignition circuits so you have to be really careful about this procedure. Sometimes they have kits to bypass the system and they guarantee that it will work - might want to look into that alternative.

well one if the door sensors are tipping.
did you read the chapter on the anti theft system yet?
in the FSM
or at alldata.com
diagnosis is not all that easy.
but step 1 is , finding which sensor tripped, and then testing it.
(it might even just be rusty)
on most cars this old we defeat it . as they can be problematic.
old connections love to fail.

Wayne White wants more answers to this question
piggybacker....
post symptoms.
same car ?
what fails,
1: engine wont run immoblized
2: alarm dead.
3: alarm trips when all is good.
4: does car drive perfectly day and night.
5: do all other things work perfect. radio, lights?
6: do any cluster lamps fail, keyon, for example
the immobilizer lamp must go out, per operators guide.

we can not guess any of that.
it must be stated up front
why not start your own post.?
with all symptoms. good and bad.

You will need the dealer to perform a diagnostic scan to see what is causing this, it can be one of about 6 sensors.

will the anti theft system stop your car from starting ? if so how do i rest it on a 1998 isuzu trooper

pull the fuse and there is a sensor adjustment for those but you need to have it checked by a car audio and alarm guy

No valet switch from the factory i think but the isuzu dealer can sort this with the tech II scanner ,it will let him reprogramme all the codes .

you should be able to use the key to unlock the driver door or the back hatch and that should disable the anti theft.