Originally Posted by johnnyclyde
. . He said there was a securtiy button we needed to push first. I discovered the button, but the car still will not start. It doesn't even turn over. When you connect a charged battery, the hazards immediately begin to flash on and off for a while. If you get in the car and turn the key, all of the electronics appear to work, but the car will still not turn over. The hazards will flash, and a little red light under the steering wheel flashes as well.
First of all, I really hope you're not some thief trying to get info on the internet on how to jack someone's car. But then you mentioned you have the keys, so maybe not. Anyhow, that's definitely not a BMW thing, sounds more like an aftermarket alarm. The security button you mention is probably the valet switch for the alarm, a lot of them work by pressing the button within a few seconds of turning the ignition to the run position. Beyond that, you really need more info from your brother to figure this out.