* Faulty Ignition Switch: This is a prime suspect. The ignition switch controls the power flow to various components, including the dash lights. If it's malfunctioning, it might not be completely cutting off power when the key is removed.
* Problems with the Body Control Module (BCM): The BCM acts like a central computer controlling many electrical functions. A faulty BCM can cause all sorts of electrical gremlins, including persistent dash lights.
* Alternator Issues (Less Likely but Possible): While a failing alternator usually leads to the battery draining, a problem with its voltage regulator could cause it to continue supplying power even when the car is off, thus keeping the lights on. This is less likely than the ignition switch or BCM issues.
* Parasitic Drain: This means there's something drawing power from the battery even when the car is off. A faulty component (like a radio, dome light, or even a faulty door switch) could be the culprit. This would eventually drain the battery, but the dash lights are an indication of the problem.
* Wiring Issues: A short circuit or damaged wiring somewhere in the system could be causing the constant power flow to the dash lights. This is harder to pinpoint without a thorough electrical system check.
What to do:
1. Check the battery: Make sure the battery terminals are clean and securely connected. A loose connection can cause intermittent electrical problems.
2. Disconnect the battery's negative terminal: This will completely cut off power to the car's electrical system. If the dash lights go off after disconnecting the battery, it confirms a parasitic drain or a problem within the car's electrical system. *Remember to reconnect it once you've addressed the issue.*
3. Have a professional diagnose the issue: Unless you're experienced with automotive electrical systems, it's best to take your Cavalier to a mechanic or auto electrician. They have the tools and expertise to diagnose the problem accurately and safely. They can use a multimeter to trace the parasitic drain if that's the cause.
Ignoring this problem will eventually drain your battery, leaving you stranded. Addressing it promptly is essential.
