Both the brake pedal adjustment and seat position lever/button on my 2002 Mercury Mountaineer have died similtaneously. Fuses have been checked and seem fine. What could the problem be?

adjustable pedal relay Adjustable Pedals System Components
The adjustable pedals system consists of the following components:
• The adjustable pedals position switch
• The driver seat module
• The adjustable pedals relay
• The adjustable pedals motor
• The brake pedal position sensor
Adjustable Pedals System Operation
The adjustable pedal system is controlled by the adjustable pedal switch or the driver seat module and operation can occur only while the transmission selector lever is in the PARK position. The adjustable pedal assembly is moved forward or backward by a motor, which is fixed to the brake pedal actuator with a drive cable to the accelerator pedal actuator. The adjustable pedal motor is operated by 2 motor control circuits from the adjustable pedal relay. In an inactive state, both of the motor control circuits are closed to the ground contacts within the relay. The relay coils may be energized by the relay control circuits from the driver seat module or the adjustable pedal switch. When a relay coil is energized, the motor control circuit is switched to the battery voltage supply contact. The adjuster motor is bi-directional and the direction of the pedal assembly travel is determined by which of the motor control circuits is closed to battery voltage, while the other remains grounded.
The driver seat module monitors the location of the adjustable pedals using the brake pedal position sensor. The brake pedal position sensor is supplied with 5-volt reference and ground circuits from the driver seat module. The position sensor signal circuit is referenced from ground within the driver seat module. The signal voltage monitored by the driver seat module ranges from 0.39-4.58 volts and is determined by the wiper location on the resistor within the position sensor. The position sensor circuit voltage level is used by the driver seat module to determine the position of the adjustable pedals when storing or recalling memory position settings.

make sure it is in park with ignition on to adjust seat,
CONDITIONS FOR MEMORIZED POSITION ACTIVATION Ignition key "ON" and shift lever in "P" position All parts of the memorized positions can be activated. However, if the brake pedal is being depressed, the seat position will not change. Key not in ignition switch and within 30 seconds of opening driver's door The memorized position can be activated. If any driving position memory switch is pushed while one of the memorized driving position profiles is being activated, the operation will stop. To reactivate the system, push the desired button ("1" or "2") again. The driving position memory control system cannot be operated while the vehicle is moving. If the vehicle's battery is disconnected, the computer's memory will be erased and the memorized position will have to be set again.
-------------------------------------------------------------------------------------
if you wouldve followed

paulmacintyre s answer,you would not have needed to post it again,

BRAKE LIGHTS AND SHIFT LOCK
Look under the dash, on the brake pedal arm. There are one or two switches that activate brake lights and/or shift unlock. Check for loose mounting nut or a missing rubber nubber. Is the brake pedal coming all the way back up? Look on the floor for something not usually found there. These switches are adjustable and it may be as simple as adjusting them. Have a helper look for brake lights on and shift lever unlocked while you push and release the switches with your finger. Depress the brake pedal to get it out of the way. Remember to set the park brake first. Could just be a bad switch or loose connector. Check fuses and the bulbs. Is shifter fully in Park?

check switch at brake pedal and relay under hood (in fuse box)

If your brake lights will not turn off, check it this way-Pull UP on the brake pedal. If the lights go off, you need to adjust the stop light switch, which is mounted on the upper brake pedal (it has an electrical plug in attached to it)

The BRAKE LIGHT SWITCH needs to be Readjusted, Simply Move it Closer to Pedal Arm to Adjust. There is a NUT that you must Turn to do this. If you take a Good Look at it it is SELF EXPLANITORY.
I Hope this Helps , Well I Know it Will as it5 is OBVIOUS as to what the Problem is. Have a Good Day

check your brake switch if its sticking or damaged.....and also your brake pedal travel. Hopefully this helps

THERE IS A SENSOR ON THE BRAKE PEDAL THAT RELEASES THE THE SHIFTER.THERE A 3 COMPONENTS INVOLVED.U CAN PUT IT IN NEUTRAL BEFORE U START THE CAR.THEN WIL SHIFT.

CLICK HERE FOR YOUR OWNERS MANUAL in PDF format.

Check your shift interlock switch on the brake pedal. If it is out of alignment or has failed the shifter will not unlock to enable a gear selection.

Also - a fuse may be blown, or you may have a taillight out.

You can manually unlock it in emergency situations.
Taken from P.181 of the manual......

Brake-shift interlock
This vehicle is equipped with a brake-shift interlock feature that prevents
the gearshift lever from being moved from P (Park) when the ignition is
in the ON position unless brake pedal is depressed.
If you cannot move the gearshift lever out of P (Park) with ignition in
the ON position and the brake pedal depressed:
1. Apply the parking brake, turn ignition key to LOCK, then remove the
key.
2. Locate the access cover plate to
the brake-shift interlock override. It
is located on the underside of the
steering column.
3. Rotate the access panel
(counterclockwise) with a flat head
screw driver until it is lined up to
the access hole in the open position.
4. Insert a tool (or screw driver) into the access hole to override the
brake-shift interlock. Apply the brake and shift into Neutral.
5. Return the cover plate (rotate
clockwise) to the closed position.
Start the vehicle.

If it is necessary to use the above procedure to move the gearshift lever,
it is possible that a fuse has blown or the vehicle’s brakelamps are not
operating properly. Refer to Fuses and relays in the Roadside
emergencies chapter.




Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Greetings larslabs,
My name is Dennis and I can assist you to finding your parking brake adjustment location.
1) the adjustment is located so that you have to remove your center console floor finish panel (this is the drink holder).
2) raise your parking brake lever and gently pry the plastic tabs from the center console.
3) Once you can see the park brake lever you will see a nut that is turned to adjust the lever so that it has 5 clicks when it is applied.
Glad to be of assistance and thank you for using FixYa. Please rate the solution because I can learn from your rating (and it keeps my rating up to date). Thank you, Dennis