Security Light

My friend has a 1999 GA v6 he called me today and said that the security light was flashing and then after he started his car it was still flashing and then he car shut off... does anyone know what could be happening?

Sounds like somekind of malfunction with the passlock security system. Try reseting it by doing this:

Attempt to start the car by turning the key to the Start/Run Position.

Observe that the vehicle fails to start and that the security light is illuminated.

Release key to the 'ON/Accessory' Position. (DO NOT turn key to the 'off' position.)

Allow the vehicle to sit with the key in the 'ON/Accessory' Position for no less than 11 minutes.

Turn key to off position and allow the vehicle to remain in the 'OFF' position for no less than 30 seconds.

Repeat #1 - #5 for 3 cycles.
On 4th attempt, car should start.

NOTE : Since this is a fairly long procedure, limit all electrical sources, such as disconnecting headlights, to prevent discharge of battery.

NOTE 2 : It is SAFE to wait LONGER than the allotted time, but it is not safe to wait less time. I.e. 12 minutes instead of 11 minutes should be safe; however, waiting 10 minutes instead of 11 minutes is not safe.

Properly executed, this procedure should take approximately 35 minutes to complete

Good luck.