Will not crank, alarm (horn) beeping

ROETY

MEMBER
2005 TOYOTA MATRIX
1.8L
4 CYL
2WD
AUTOMATIC
90,000 MILES

After battery disconnect and reconnect (cleaning terminals) car horn is beeping (for a while). Car won't crank. My key fobs haven't worked in awhile. I tried a few things like turning the key and after ten minutes tried again, unlocking doors with keys. Is it possible to disable or bypass the factory installed alarm/immobilizer security system? Going to get a new key fob but was hoping to start the car somehow before then. One YouTube video I see is reset ECU jumping pins 4 to 13 for 30 minutes. I don't want to mess something up. Thanks for any help here.

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,973 POSTS

I wouldn't jump pins for the ECM do you have a security light flashing? If so this guide should help us:

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

Also lets check the battery condition this guide will help:

https://www.2carpros.com/articles/car-battery-load-test

and

https://www.2carpros.com/articles/starter-not-working-repair

Please run down these guides and report back.

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Friday, May 29th, 2020 AT 11:48 AM

STEVE W.

MECHANIC
13,003 POSTS

The factory system is integrated into the rest of the car and there is no way to bypass it. Is the theft security light on? Does it go out as soon as you try the key? If the light stays on then there is an issue in the system, if the light goes out when the key is in then there is a different issue than the anti-theft.
What you can try would be to disconnect the battery, then short the battery cable connectors together for a few minutes, that will drain off the capacitors in the system. Reconnect and see if anything changed. The next step would require a dealer level scan tool to determine if the anti-theft or the ECM itself has a problem.

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Friday, May 29th, 2020 AT 11:51 AM

ROETY

MEMBER
3 POSTS

I pulled a little red fuse for the alarm box under the dash, alarm and immobilizer are disabled car is running again, Thanks for your response

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Friday, May 29th, 2020 AT 9:58 PM

STEVE W.

MECHANIC
13,003 POSTS

That doesn't sound like a factory system. They don't have an individual fuse for the alarm like that as it's part of the circuit that powers the engine controller and the transponder system. But it's running. I would be real careful though, if the system locked it up that way once I wouldn't trust it to not do it again.

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Friday, May 29th, 2020 AT 10:26 PM