Problem With 03 V35 Nats Anti Theft System

[03v35]

Hey SA,

My car has been acting strange recently. It would lock and unlock itself without me pressing the key, it would lock me out and I wouldn't be able to unlock it with the key fob. This happened once before and all that needed to be done was to place a new battery in the key fob. I tried that again this time, but for some reason when I try to start the car, it cranks but doesn't turn over. I also noticed the red light on the dash stays red when I rotate the key to the ON position, right before start.

Any help would be enormously appreciated guys...my cars parked at westfields until I can figure this out.

Thanks in advance,

Luke

[JustinVu]

Interested in answers for this question. Currently having the same issue and have been replacing with Energizer CR1620 )...8 dollars every month i think )

[GeeDog]

Might want to clarify what you mean by "it cranks but doesn't turn over" - cranking generally means that the starter is turning the engine - ie turning over. Do you mean "cranks but won't start"?

Edited August 18, 2013 by GeeDod

[03v35]

Sorry, Yep it cranks but doesn't start. As if its 90% of the way to starting but something is stopping it.

[sonicii]

The NATS system is usually independant of the central locking. NATS uses a chip in the key head and a reader in the ignition barrel. So for some reason it isn't reading the chip in the key head, or the chip isn't registered in NATS. Is it the only key you have? If you have another key, try that one.

[scotty nm35]

Could also be the crank angle sensor.

I have never worked on a NATS failure, but I have seen a V35 with a NATS fault, usually a mech would get an auto elec out to fix it.