I'm sorry not to know this, but does my wife's '09 RX have a security code on the non-nav stereo?

Her car wouldn't start today. When I tried later, I heard a fast fluttering noise. I'm charging it to see if it will start with a full charge. Even if it starts, I still may get her a battery just to feel good.

 

No security code. It does sound like a bad battery. When you replace the battery you will need to reset the doors, windows, rear hatch, moonroof, radio. The directions are in your user manual.

 

Also, and you may already know this, but most auto parts stores will check the condition of your battery for free (if you can get it there...).

 

I checked it at AutoZone and found it had a bad cell. Bought an Interstate battery at Costco and installed it today. Before removing the cables, I hooked up a trickle charge so I could save all my memory settings. It sure would be easier if there was a port for this.