anti theft reset

Hi Gloria,

Unfortunately, these systems are designed purposefully to avoid being bypassed so that the car cannot be stolen.

I attached a copy of how it works and as you can see, your key needs to send a coded message to the ICU which sends it to the ECM and they all agree that the key is a good key. Once this happens, the ECM sends all the needed messages to start the vehicle. Without this coded message, there is not way to bypass it.

Sorry. Let me know if you have further questions or if I can help figure out what the issue is. If you want me to, then we need to retrieve the codes in the system. That will tell us if there is an issue with the key or one of the modules.

Need to bypass immobilizer? Light flashes.

Hello,

I have included for you in the diagrams below the Isuzu Factory Technical Service Bulletin (TSB) for resetting the Immobilizer System. Please go through it and get back to us with what you decide to do.

Thanks,
Alex
2CarPros

When I turn my key the engine sounds as if it is going to start and then it turns off and the immobilizer light begins to blink. I took out the battery thinking that it was low, but it is not. I had to get a key made through the dealer, but the alarm switch did not come with it. They told me I would be able to use this key until the alarm came. They also told me that this 2004 rodeo does not have a chip in the key, so I should not have any problems with copies. How can I start my engine and turn off my immobilizer light?

i recently purchased a 2004 rodeo and had to get a duplicate key made. The dealer told me that the key does indeed have a chip in it and if you try and use a non-chip duplicate, you may experience immobilizer problems. I would try to reset the system by following this guide.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Try a hard reboot of the security system.

Yep that worked great guide

Key is lost as is key fob. ignition is unlocked, switch is accessible. Can I bypass immobilizer as vehicle has to be driven to workshop?

Hello,

In the diagrams down below I have included all the information for your vehicle about the immobilizer system. If you have lost your immobilizer transponder ignition key, you should contact your local dealership for support. Please go through this guide and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

Engine will not turn over. All lights come on it is in park and when key is turned to start it seems locked out from turning over. When key is removed factory alarm does a ding dong 10 times. I have disconnected battery for 20 minutes and reconnected with key in on position. Still no turn over.

try a security system reset see pic and link one should get it going if not that then scan for codes . if battery was dirty/replaced sets the security off.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Check out the diagrams (Below). Please let us know what you find.

does anyone know how to reset the anti-theft system? please help.

This will work with most cars, Remove the negative battery cable from the battery. Then hold it to the positive battery terminal for 1 minute this will discharge the capacitors rebooting the system. This guide can help as well.

https://www.2carpros.com/articles/how-to-reset-a-security-system

GENERAL DESCRIPTION
The circuit consists of the starter switch, anti-theft & keyless entry controller, antitheft horn, front door and tailgate key switch (detect and tamper) switch, door lock actuator for each door, engine hood switch, clutch start switch (M/T), ANTI-THEFT indicator light and mode switch (A/T).

The system operates as follows: After locking the starter switch and removing the starter key (this sets the alarm), if the door is unlocked in any way other than with the proper key, the headlights start flashing, the horn sounds, and the starter circuit is disabled. (However, the engine hood and all the doors must be locked and closed.)

Once the system has been placed in the warning or alarm condition, it can be released only when the starter switch is shifted from "OFF" to "ACC" by the starter key, or when the lock of the front door or the tailgate is released (to activate the detect switch) by the starter key.

CIRCUIT OPERATION

Anti-theft operation
The keyless entry and anti-theft control unit receives various input from switches in the four doors on the Rodeo, two doors on the Amigo, and tailgate to monitor any unauthorized entry. If notified of such case, the control unit will flash the headlights, the parking lights and interior lights, sound the anti-theft horn, and disable the starter.

Let us know if it does.

The Medic

My car alarm goes off erratically when I use my key in the drivers door to open the car. My remote does not work. How can I disengage my alarm so this will stop?

Hi coweyesone, Thank you for the donation. I can only finid the procedures for turning the horn off and hope it helps.

Tried this procedure already. Is there a way to totally disengage the system. I don't need the alarm at all.

I could not find any data on the method to disable the alarm except to disconnect the control unit and this might affect other functions such as the security system.

The alarm/security system appears out of sync. Note: the engine was replaced (new engine block) about 12K miles ago.
Symptoms - 1. When the truck is shut off and the key is removed and the drivers door is opened, the warning buzzer goes off as if the key is still in the ignition. 2. Then, when the drivers door is closed, the chirp occurs and after about 10 seconds the doors lock - all this without doing a thing. 3. About 5% of the time the ignition will not unlock when the key is inserted. After many 'locks/unlocks' the key will turn. 4. Twice in last 25 times, the truck shuts itself off while driving downe the road and when trying to restart, the alarm goes off.
HELP!!

HI there, Thank you for the donation, Try this re set,let know if it works.

Sounds like it may be an issue with the key tumbler/ignition switch if it acts like the key is still in after removed. You may want to start there Mark (mhpautos)

Didn't seem to do it but I don't really think the remote needs to be reprogrammed, I think the system itself is totally messed up...I'd really like to just disconnect this thing...cut wires, take out fuses, whatever. Any ideas?

Hi there,

It appears that an initial post i made did not go through, i indicated that there is no way to just disarm the system with removing a fuse or cutting a wire, there are to may lock down systems, that is if the system is tampered with the immobiliser will not allow the engine to start, this is done internally with the ECU, so i do feel that, that is not a real option unless you have an auto electrician to do the by passing, as there is no information on line to do this, it will have to be done hands on, or do the diagnostic i sent.

Mark 9mhpautos)

Thanks for the additional info...I'm not surprised it's difficult to 'disarm' the security system...kinda makes sense, huh? Anyway, I know a guy from church who's family owns an import service station and he's gonna take a look at it...thinks it might be something in the ignition itself that is confusing the alarm system. Thanks for your help, this is a really cool service you guys offer - with a family of 4 drivers (and 5 cars), I'm sure to use this service again!! Shawn.

Hi Shawn,

Thanks for the feed back, we do get a few questions like yours and unfortunately our response is usually the same, with after market alarms and immobilisers this is normally a fairly easy fix, but with factory fits, well they just love to make things hard, for the crooks and good guy techs, lol.... let me know how you get on, any info on this will be of help for others in the future, thank you for using 2carpros.

mark (mhpautos)