On our 2004 we had the same problem and it was something with remote starter it was only 30.00 part and has worked great since!
Usually means that all doors (including rear hatch) are not closed securely.
On a 2002 Mercury Mountaineer : Put your low beam head lights on and pull the headlight selector switch towards you
The first model year of the Mercury Mountaineer sport utility vehicle was 1997 Did you mean 2005 ?
instrument panel or controls?
You can view the Mercury Mountaineer owners manuals online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides ( then select your year , and Mountaineer , etcetera )
In the 2000 Mercury Mountaineer, the tail lights fuse is located in the interior fuse box, which is typically found on the driver's side, near the dashboard. The specific fuse for the tail lights is usually labeled as "Tail Lamps" or "Stop Lamps." You can refer to the diagram on the fuse box cover for exact placement. Always ensure the vehicle is off before checking or replacing any fuses.
a malfunction has been detected ( could be a sensor )
bad switch or possibly stuck switch
In a 2003 Mercury Sable, the fuse for the interior lights is typically located in the interior fuse panel. It is generally labeled as "Dome" or "Interior Lights." You can find the fuse panel under the dashboard on the driver's side. Always refer to the owner's manual for the exact fuse location and specifications.
The first thing to do is check your fuses. It may be a very simple fix.
If the ((ABS)) Light is on then it's a good thing indicating that the Antilock brakes sensor is in good condition. I too have a 2002 mountaineer
I'm having the same issue as you are. Reshutting...uh...nearly slamming the doors multiple times eventually fixed it. However the problem is back every day and now the rear interior light won't shut off. All the doors are shut and there is nothing blocking them. I'm still searching for an answer. 1997 Mercury Mountaineer 5.0 L could be that the rear hatch may not be closed completely, i have had the same thing happen on my 1998