Interior light and exterior mirror lights stay on.

JBRIENZA

MEMBER
2002 MERCURY SABLE
3.0L
V6
2WD
AUTOMATIC
63,000 MILES

When taking off with car in drive, the door ajar warning light is still on. I have check all doors and they are all fully closed. What causes the warning light to go off and on, the doors to lock and unlock repeatedly for a few seconds? The warning light stays on as long as car is driven. After car is shutoff and locked the interior and exterior mirror lights do not shut off for sometimes hours. What causes this and what needs to be repaired or replaced? If a part needs to be replaced, where can it be located in car?

2 Replies

RACEFAN966

MECHANIC
5,029 POSTS

The door pin switch in the door latch. I would replace the drivers door that is most common one. That should take care of the door ajar and interior lights. Lets start there.

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Tuesday, June 10th, 2014 AT 7:32 AM

WRENCHTECH

MECHANIC
20,757 POSTS

Here is a technique that often works well and may eliminate the problem at no cost.

Get a can of spray lube like WD40 or something like it and has a straw on the nozzle. Spray it generously up into the latch mechanism. Now open and close the door numerous times to work it in. Repeat this process several times. Since you don't really know which door is causing the problem, you should do all of them. It's usually caused by the most frequently used door but it's not guaranteed to be that one.