Anti theft light flashes

MARK LA RUE

MEMBER
2004 ISUZU RODEO
3.2L
6 CYL
2WD
AUTOMATIC
293,809 MILES

I changed the heater core, disconnected the battery, airbag, radio and cigarette lighter then when I reassembled all and reconnected everything the anti theft light flashes when the ignition is turned on and is a no start now. What is the proper way to reset the anti theft system? By the way, I have the original key that started the car previously to the work done and the system is factory without a key fob. Any info would be appreciated, thanks.

4 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

Let's first start with an anti-theft, security system reset. Here is the tutorial:

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

Let us know what happens and we'll go from there. Hope this helps and thanks for using 2CarPros.

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Friday, February 19th, 2021 AT 12:21 AM

MARK LA RUE

MEMBER
2 POSTS

I've tried all five of these steps in "the how to reset the security system" to no avail. If you can come up with anything else I'd sure be thankful. Thank you for your time and attention.

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Friday, February 19th, 2021 AT 5:21 AM

STEVE W.

MECHANIC
13,580 POSTS

It's very possible that one of the connections for the system isn't fully connected or a pin was damaged during the repairs. To avoid tearing it all back apart I would take a scan tool and see if you can talk to the anti-theft system and see if that one will register the various steps that disarm it. Like, key in lock, key to run or start, then see if it shows anything like a communication fault. Isuzu used a mix of GM and their own parts on those and they are rather finicky about the scan tool they will talk to, a Tech2 will work but some of the clones won't.

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Friday, February 19th, 2021 AT 8:55 AM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

Yes, I agree with Steve on using a GM Tech2 scanner to test the anti-theft system further. Those scanners are getting harder to find but are out there. Maybe you know a friend who can loan you one? I've attached a picture below of what it looks like and what they're going for on EBay. Hope this helps and thanks again for using 2CarPros.

Danny-

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