Cw050621

My cars security light is flashing and causing my car not to start but it will turn over how do I reset it so my car will crank

salimshah

Are you using the master key or valet key matched to your vehicle? Without the registered keys you can crank as much as you like, but the vehicle mobilizer will not let it start. The register magnet is at the base of the key. Please check the sticky threads or search on imbolizer. [Note putting a new battery in the key fob will not help. You need to bring the registered key next to the ring round the the place where you insert the key.

Salim

LexGang

did you fix it same issues I’ve swapped at ecu and key ignition no luck still flash used my ecu and key ignition in my other car starts up fine no security light any help

salimshah

Can you please rephrase the post?

Salim

Mauser

If you have replaced your ecu with a used one it will need to be "flashed". This will reset the immobilizer. I can help with flashing.

salimshah

There are so many possibilities ... the new eco could be a used ecu and could be holding the 'old' settings. He may have the set of keys along with the ECU and then either he plans to swap out all the lock cylinders or just bring the matching key near the start sensor.

We really need to understand what is going on first.

Salim