I have a 1998 isuzu rodeo, just recently i started having problems with the car alarm. i do not have a remote for unlocking the doors, and everytime I insert the key and turn it to unlock the doors, the alarm goes off! it drives me nuts! help!

use a scan tool yet>? see if there are DTC errors related?
alldata.com has the virtual FSM book. read that yet?
has full docs.
all it takes is the above schematic, and a $10 voltmeter.
guessing will probably not win.
tests.
wana test or gue$$

lock the doors and shut the door. then stick key in door and unlock it manually

need to check for fault codes for the engine and the security system. the problem may be connected somehow, but it sounds as if you may have multiple problems.

when you hook up the battery, either use the pad to unlock doors, or use the key to unlock door, regardless if the door is unlocked or not. Had this problem numorous times, always worked. good luck!

Your battery has enough amps and voltage to power up the accessories, but does not have enough amps to engage the starter motor. The click you here at the starter is the solenoid trying to allow the starter motor to turn. Either replace the battery and/or check the battery connections for corroded terminals.

Hello, patrick4012 and thank you for asking your question on Fixya!

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Here is what I found on your relay switch

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Thanks for the vote, and good luck!

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A 98 Isuzu rodeo alternative alternative little key does that work the alarm system

You cannot disable the system because it's tied directly to the ignition system. The remote is most likely not the primary cause of the issue. Anti theft systems are directly wired to the computer and are designed to disable the vehicle if necessary. It sounds to me like you have two issues. One being the remote. Change the battery and it should function properly, but you may still have the problem of the lights and the alarm sounding off due to the sensor on the ignition switch itself. That will most likely need to be replaced to resolve the issue. Hope this helps, good luck!

Use the key and unlock it from the passenger side. That will disarm the alarm then using the key unlock the driver door and start the vehicle.

There is a separate computer box for the car alarm, try disconnecting the wiring harness that goes to it.