My Toyota Corolla is doing something weird: the taillights stay on for a few minutes after I turn off the engine, like the system doesn't recognize that I'm not driving anymore. Could this be a problem with the control module or something simpler?
It's probably a time relay that keeps the lights on for a bit after you turn off the car, that's pretty normal in a lot of models, but if they stay on for a long time or don't turn off at all check that you don't have a light switch in the intermediate position. If it keeps happening, then it could be the module, but first rule out the obvious stuff.
Corollas have a delayed shutoff system for the rear lights that's completely normal, especially if you have the "coming home" function or something similar activated on the dashboard. What you do need to watch out for is if they stay on for hours or never turn off at all, because then we'd be talking about a failure in the control module or in the ambient light sensors that detect when the trip ends!
How long exactly do they stay on? Because there's an important difference between a few minutes (which is normal) and half an hour or more.
The behavior you're describing is super common in modern Corollas. A lot of manufacturers keep the taillights on for a while after you shut off the car for safety reasons, especially if you're getting home late at night. It's a time relay that works on purpose - it's not a malfunction. My car does exactly the same thing and I spent weeks thinking something was wrong until I realized they turn off on their own after like 3-4 minutes.
What you should actually check is whether you have some "coming home" or "leaving home" feature enabled on your dashboard. Some models have these options in the settings menu and they can keep the taillights on longer than usual. If you're not sure whether it's on, checking your owner's manual will save you an unnecessary trip to the shop. That said, if they stay on for way longer (like more than 10 minutes), there could actually be something weird going on with the relay or the control module, but first we'd need to confirm exactly how long we're talking about.
Don't just brush it off thinking it's normal if that behavior changed all of a sudden or if the lights stay on for more than 5 or 10 minutes. What most people don't mention is checking the trunk door sensor - if it's stuck or dirty, the car can think you're still inside and keeps the lights on as a safety measure. Before you go spending money on a module diagnostic, get underneath the trunk (carefully), clean the contact sensors really well with a dry cloth, and try again. On a lot of Corollas that sensor gets dirty from dust or moisture and causes exactly this.
If this behavior is recent and the lights stay on longer than you remember them doing before, it could be that the control module is failing to detect that you closed the door or turned off the ignition properly, so it's worth checking those sensors before assuming it's just the system's normal delay.
Don't start disconnecting the battery or doing drastic stuff without first checking something most people don't mention: the rear lights switch can get stuck or have poor contact, especially if the car's old. If the delay is progressive (they stay on longer each time) rather than constant, that points more to an electrical fault than normal function. Best thing is to notice exactly how long they stay on the next couple times you park it, because that'll tell you if it's designed that way or if you need to check the switch wiring or the relays.
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