[NAM1025]

Have a weird problem with my CTS. The car will start... sometimes... I can tell if it's not going to start because when I turn the key to the on position only the 'BRAKE' and 'Theft' lights will light up. If I turn the key on and off a few times eventually the other lights will turn on, and I can start the car. Another issue is sometimes when the car starts, it will immediately shut off. I then just have to repeat the process I explained earlier until it stays on.

 

[dkozloski]

It sounds like the key switch is worn out.

 

[NAM1025]

I actually think we just found the problem. We swapped out the HI-Beam relay with the Ignition 1 Relay and it seems to start every time now.

If you pull the Ignition 1 Relay and turn the key on, only the 'BRAKE' and 'Theft' lights are on, once we put the HI-Beam relay in, all of the lights came on.

If it stops working again I'll update this thread.

 

[mattfranz]

Sounds like the relay was the problem. If it persists you may want to look into how dirty the battery connections are/getting your battery tested. And if that all checks out good it could be the immobilizer.