The security system is activated all the time unless the proper key is in the ignition its part of the gm vatsII system, the only time you will see the light on is if there is a problem with the resistor pellet in the key being out of range or if there is a problem with the computer that runs the system also known as the vats II brain. there is three parts to the system if you look up gm security system or vats II on the internet it will explain everything in detail and give diagrams.
If both sides (right and left) don't blink on and off, the blinker "can" may be the culprit.
Usually in the ign lock cylinder if you have the VATs type key with the resistor in the key. The wires attached to the key lock cylinder often break. If you have the "pass key" type without the little resistor chip then it is different. But it also usually involves removing the key lock cylinder.
Blown bulb.
Loose battery or alterator connections
It means the bulb is out or something else is wrong.
Lock cylinder must match the key for security system to work
The security light will blink when either door, hatch, or hood is opened and will continue blinking until it is closed. Check all 4 switches for proper operation. If the bad switch is disconnected it should turn off the light. If the security light is on constantly instead of blinking that is to let you know that the alarm system is activated and should turn off after a few minutes.
Well, there are a couple of possibilities. One may be a short in the steering column to the ignition (loose wire, etc.). Do you frequently adjust the tilt steering? If so, does this tend to happen more often when the wheel is up, or down? The movement of the wiring in the column could be shorting one of them out. I know you said that there is no pattern, but there probably is one that you might not have realized yet.
To retrieve trouble codes from a 1995 Buick Riviera, you'll need to use the On-Board Diagnostics (OBD) system. First, locate the diagnostic connector, which is typically found under the dashboard near the steering column. Use a jumper wire to connect the A and B terminals of the diagnostic connector. Then, turn the ignition key to the "On" position without starting the engine, and the check engine light will blink to display the trouble codes.
Flasher is bad. to replace it it is under the dash at the back of the steering column.
94.9 then you will see the security light on wait about 30 sec's it will start to blink then its on.
Yes, the blinking securtity light will blink when the car is off.