Your 1998 Pontiac Bonneville will not start but the security light and seat belt stays on what could this be your mechanic has had car three weeks now?

A 1998 Pontiac Bonneville's security light and seatbelt light staying on while the car won't start strongly suggests a problem with the vehicle's anti-theft system (Passlock system) or a related electrical issue. Three weeks with a mechanic is excessive unless they're dealing with extraordinarily difficult-to-diagnose issues or parts delays. Here's a breakdown of possibilities:

* Passlock System Failure: This is the most likely culprit. The Passlock system prevents the car from starting if it doesn't recognize the correct key. Problems can stem from:

* Faulty Passlock Sensor Ring: Located in the steering column, this ring detects the key's transponder chip. A damaged or dirty sensor ring can prevent communication.

* Bad Ignition Switch: The ignition switch itself could be faulty and unable to communicate properly with the Passlock system.

* Faulty Key: The transponder chip in your key might be damaged or malfunctioning. Try a spare key if you have one.

* BCM (Body Control Module) Issue: The BCM controls many electrical functions, including the security system. A faulty BCM can interfere with the Passlock system.

* Other Electrical Problems:

* Low Battery Voltage: While you mention the lights are on, a very weak battery might not provide enough power to crank the engine, even if the lights are illuminated.

* Faulty Starter Motor: A bad starter motor won't engage, preventing the engine from turning over.

* Dead Neutral Safety Switch (NSS): This switch prevents the car from starting unless it's in Park or Neutral. A faulty NSS can cause starting issues.

* Wiring Problems: Damaged or corroded wiring in the ignition system or related circuits could be disrupting the starting process.

What you should do:

1. Contact the Mechanic Immediately: Three weeks is unacceptable. Demand an update and a clear explanation of the delay, the diagnosed problem (if any), and the estimated time for repair. Ask for specific parts ordered and their expected arrival.

2. Get a Second Opinion: Consider taking your car to another reputable mechanic for a second opinion. A fresh set of eyes might quickly identify the issue.

3. Research Your Mechanic: Check online reviews and see if others have had similar experiences with lengthy delays.

The prolonged delay suggests a deeper issue than a simple Passlock problem, or perhaps significant parts backorder issues. Persistent follow-up is crucial. Don't let the mechanic continue to keep your car indefinitely without clear communication and progress.