* Wait: The simplest method. Just wait for the timer to expire (usually a few minutes).
* Door Switch: Make absolutely sure all doors and the trunk are completely closed. A slightly ajar door can keep the lights on. Try firmly closing each one.
* Check the Overhead Console: Some Town Cars had a manual override switch on the overhead console (near the dome light). This might be a small button or a rotary switch. Look for something that looks like a light switch.
* Possible Faulty Switch: If none of the above work, you may have a problem with a door switch, the timer circuitry, or a faulty dome light switch itself. This would require a mechanic or a more in-depth troubleshooting to find the faulty component.
If the lights stay on even after checking everything, there's likely a malfunction in the electrical system and professional help is recommended. Leaving the interior lights on can drain your battery.