Theft deterrent reset

[CBVibe]

When investigating an ABS light issue I disconnected the wiring harness in the fuse box. After reconnecting the harness the car now won't start. Security light is flashing when key is turned.

 

[negusm]

Maybe it will help if we know what year car at least?

In these cases, where the programming may have been lost, you may need to call a mobile locksmith.

I had a similar issue, and I just removed the entire security immobilizer system on a 2008 Mazda 3 following the manual backwards. I could then start it with the key and had to go to a locksmith to get the key fobs reprogrammed.

 

[CBVibe]

2008 Mazda 3 GT.

 

[CBVibe]

Update: I contacted a very friendly local garage. He suggested I disconnect both battery terminals and hold the wires together for half an hour. Guess what? It worked! Make sure the wires are nowhere near the battery if you try this.