Found this infor for the zd30

When the NATS plays up in the ZD30s it normally a faulty IMMU (the part that wraps around the ignition switch and reads the chip in the key). You can easily replace this part yourself.

owever there are a few things you can check first.
- Have you tried a spare key as they have a security chip in them.
- A common fault on the Z30 is the aerial ring in the key barrel.
- Worst case scenario you should be able to get your IP modified for about $400 to solve the issue.