How do I adjust the back of the seat? I am short, the seat was adjusted for a much taller person. We got the seat bottom moved forward but have been unable to adjust the seat back so that it sit up straighter.

Seat adjustment ranges are sometimes limited and sometimes there is a fault, such as a coin or something falling into one of the runners.

Cars intended for the premium market often have forward/back, up/down and sometimes tilt adjustment for the driver seat while for the small car, basic or budget market usually only have forward or back. Because on average a person who has shorter legs and needs the seat forward will also have a shorter body so enterprising designers have made the seat runners of some models slope upwards to lift the driver as the seat is moved forward.

Adjustable steering columns are fairly common, though only in the rise/fall plane. I haven't seen a telescopic column for many years. What is really needed is adjustable pedals but designers and manufacturers are very reluctant to go down that avenue, though there are companies specialising in such modifications.

You need to be on the ground on your knees with a good light looking under the seat to see if the available adjustment range takes the seat to the true limit of its travel in both directions.

Most Ford products are designed so the seat belt latch by the center console moves with the seat. The bottom of the latch rides on the seat rail, and with time sometimes it builds up a little play on the rail. As the seat moves forward or back, the seat belt guide often tilts forward or back, just a bit, on the rail, and gets stuck. So you can move forward or back just a bit, but then it jams and you can hear the motor, but can go no further.

The long term fix is to remove the seat, disassemble the seat belt guide and rail, and usually replace some parts.

But the short term solution is often to simply hold on to the seat belt latch and rock it forward and away from the seat as you try to go forward or back. Or, sometimes it works best to rock it backwards and away from the seat as you try to move forward or back. It all depends on which way it is binding.

There's no guarantee that it won't jam again if you move it all the way back or forward, but once you find the right position to hold the seat latch in while moving the seat, you should be able to re-adjust it where you need it to be.

If this is a 1994+ Ford, it might be that the seat belt latch is the problem. Most Ford products are designed so the seat belt latch by the center console moves with the seat. The bottom of the latch rides on the seat rail, and with time sometimes it builds up a little play on the rail. As the seat moves forward or back, the seat belt guide often tilts forward or back, just a bit, on the rail, and gets stuck. So you can move forward or back just a bit, but then it jams and you can hear the motor, but can go no further.

The long term fix is to remove the seat, disassemble the seat belt guide and rail, and usually replace some parts.

But the short term solution is often to simply hold on to the seat belt latch and rock it forward and away from the seat as you try to go forward or back. Or, sometimes it works best to rock it backwards and away from the seat as you try to move forward or back. It all depends on which way it is binding.

There's no guarantee that it won't jam again if you move it all the way back or forward, but once you find the right position to hold the seat latch in while moving the seat, you should be able to re-adjust it where you need it to be.

Most Ford products are designed so the seat belt latch by the center console moves with the seat. The bottom of the latch rides on the seat rail, and with time sometimes it builds up a little play on the rail. As the seat moves forward or back, the seat belt guide often tilts forward or back, just a bit, on the rail, and gets stuck. So you can move forward or back just a bit, but then it jams and you can hear the motor, but can go no further.

The long term fix is to remove the seat, disassemble the seat belt guide and rail, and usually replace some parts.

But the short term solution is often to simply hold on to the seat belt latch and rock it forward and away from the seat as you try to go forward or back. Or, sometimes it works best to rock it backwards and away from the seat as you try to move forward or back. It all depends on which way it is binding.

There's no guarantee that it won't jam again if you move it all the way back or forward, but once you find the right position to hold the seat latch in while moving the seat, you should be able to re-adjust it where you need it to be.

Most Ford products are designed so the seat belt latch by the center console moves with the seat. The bottom of the latch rides on the seat rail, and with time sometimes it builds up a little play on the rail. As the seat moves forward or back, the seat belt guide often tilts forward or back, just a bit, on the rail, and gets stuck. So you can move forward or back just a bit, but then it jams and you can hear the motor, but can go no further.

The long term fix is to remove the seat, disassemble the seat belt guide and rail, and usually replace some parts.

But the short term solution is often to simply hold on to the seat belt latch and rock it forward and away from the seat as you try to go forward or back. Or, sometimes it works best to rock it backwards and away from the seat as you try to move forward or back. It all depends on which way it is binding.

There's no guarantee that it won't jam again if you move it all the way back or forward, but once you find the right position to hold the seat latch in while moving the seat, you should be able to re-adjust it where you need it to be.

Most Ford products are designed so the seat belt latch by the center console moves with the seat. The bottom of the latch rides on the seat rail, and with time sometimes it builds up a little play on the rail. As the seat moves forward or back, the seat belt guide often tilts forward or back, just a bit, on the rail, and gets stuck. So you can move forward or back just a bit, but then it jams and you can hear the motor, but can go no further.

The long term fix is to remove the seat, disassemble the seat belt guide and rail, and usually replace some parts.

But the short term solution is often to simply hold on to the seat belt latch and rock it forward and away from the seat as you try to go forward or back. Or, sometimes it works best to rock it backwards and away from the seat as you try to move forward or back. It all depends on which way it is binding.

There's no guarantee that it won't jam again if you move it all the way back or forward, but once you find the right position to hold the seat latch in while moving the seat, you should be able to re-adjust it where you need it to be.

You don't mention what year your Yukon is ? This could very well be a control Module problem .
I'll post how the power memory seat's work or are suppose to work !

Memory Seats Description and Operation

Battery voltage is supplied to the memory seat module through a 25 A circuit breaker. The memory seat module supplies the seat adjuster switch assembly with a battery positive reference voltage. While the seat adjuster switches are in an inactive state the switch contacts are closed to the adjuster switch common circuit. When a seat adjuster switch is pressed to an active state the switch contact is closed to the reference voltage circuit. Battery voltage on a switch signal circuit indicates to the memory seat module the switch status is active. Each seat adjuster motor is controlled by the memory seat module through 2 motor control circuits. While the seat adjuster motors are in an inactive state the motor control circuits are closed to ground circuit contacts within the memory seat module. The memory seat module operates the seat adjuster motors by switching one of a motors control circuits to battery voltage. The seat adjuster motors are bidirectional and the direction of adjuster motor rotation is determined by which of the adjuster motor control circuits is switched to battery voltage while the other remains grounded.


Memory Set/Recall Operation
The seat adjuster motors are equipped with internal position sensors. The adjuster motor position sensors are monitored by the memory seat module and are used to determine the seat position when storing or recalling memory settings. The driver seat adjuster motors use potentiometer type position sensors. The position sensors are supplied with a 5 V reference and ground circuits from the memory seat module. The position sensor signal circuits return to an analog input within the memory seat module. During adjuster motor operation the position sensor provides a voltage change proportional to the change in revolution of the adjuster motor shaft. The memory seat module monitors the voltage from the position sensor signal circuits to determine the adjuster motor positions when storing or recalling memory seat position settings.
The memory recall switch assembly on the driver door provides inputs to the driver door lock/window switch. Battery voltage is supplied to the memory recall switch assembly from the driver door lock/window switch. When a RCL 1, RCL 2, or EXIT switch is pressed, the switch contacts close the appropriate switch signal circuit to the battery voltage supply circuit within the memory recall switch assembly. When the driver door lock/window switch receives active switch signals from the memory recall switch assembly, the appropriate commands are sent to the memory seat module using the GMLAN Serial Data circuit. The Body Control Module software version determines the personalization features available.
Memory seat recall operation is allowed only with the transmission selector lever in the PARK position while the ignition is on. The transmission selector lever position data is provided to the memory seat module by a message through the GMLAN Serial Data circuit.

There are somethings listed you are not familiar with , like GMLAN Serial Data circuit ,maybe Body Control Module software etc... GMLAN is a communincation network that the computers on the vehicle uses to share information , transmit commons etc... you can google it to read about it .

There are DTC'S - diagnostic trouble codes that can set in the module in control . Do you know what DTC'S are .

DTC Descriptors
DTC B1825 01: Driver Seat Recline Position Sensor Circuit Short to Battery
DTC B1825 06: Driver Seat Recline Position Sensor Circuit Short to Ground or Open
DTC B1825 5A: Driver Seat Recline Position Sensor Circuit Plausibility Failure
DTC B1850 01: Driver Seat Lumbar Horizontal Position Sensor Circuit Short to Battery
DTC B1850 06: Driver Seat Lumbar Horizontal Position Sensor Circuit Short to Ground or Open
DTC B1850 5A: Driver Seat Lumbar Horizontal Position Sensor Circuit Plausibility Failure
DTC B1860 01: Driver Seat Lumbar Vertical Position Sensor Circuit Short to Battery
DTC B1860 06: Driver Seat Lumbar Vertical Position Sensor Circuit Short to Ground or Open
DTC B1860 5A: Driver Seat Lumbar Vertical Position Sensor Circuit Plausibility Failure
DTC B2355 01: Driver Seat Front Vertical Position Sensor Circuit Short to Battery
DTC B2355 06: Driver Seat Front Vertical Position Sensor Circuit Short to Ground or Open
DTC B2355 5A: Driver Seat Front Vertical Position Sensor Circuit Plausibility Failure
DTC B2365 01: Driver Seat Rear Vertical Position Sensor Circuit Short to Battery
DTC B2365 06: Driver Seat Rear Vertical Position Sensor Circuit Short to Ground or Open
DTC B2365 5A: Driver Seat Rear Vertical Position Sensor Circuit Plausibility Failure
DTC B2375 01: Driver Seat Assembly Horizontal Position Sensor Circuit Short to Battery
DTC B2375 06: Driver Seat Assembly Horizontal Position Sensor Circuit Short to Ground or Open
DTC B2375 5A: Driver Seat Assembly Horizontal Position Sensor Circuit Plausibility Failure

5) Memory Seat Module is under the front of the driver seat , you could look under an see if all the connectors are fully seated.

The best diagnostic step would be to hook up the factory scan tool an see what the computer is seeing as far as inputs from the switch an outputs it's sending . I wouldn't suggest you take the seat apart an try testing electrical inputs etc.... unless you very familiar with automotive electrical systems an circuits .

The back and foward movement uses the same motor. So if it moves one way but not the other it's most likely the switch. Try to blow it out or clean it out. If pop or somthing spilled on it you will prob. need to pull switch out and take it apart to clean contacks inside.

Check to see if it got unpluged. That's not worth much, but.....