Driver side front seat power seat switch operation is erratic. The remote entry fob will position the seat all the way to the rear with the back in a slight incline position. Now, attempts to adjust the seat to a comfortable driving condition produce the following results: If the front-back position lever is actuated to move the seat forward, the seat will move only an inch but not far enough forward to drive comfortably. Now, however, if the seatback tilt switch is activated to reduce the tilt somewhat, the entire seat can now be moved forward but the switch operates in reverse, moving the switch back moves the seat forward. Similarly, moving the switch forward will move the seat back. The seat will operate through its full range of motion. However, the seat back can never be moved back, only forward. The only way to move it back is to press the button on the door corresponding to driver 1. This may be a switch problem but because of the curious behavior I fear it may be a computer problem. Can you shed any light on this?
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 .
SOURCE: 1999 volvo s80 passenger seat stuck in forward position
you will need to check to make sure no coins fell into the track and is jammed it if not you will need to replace the bottom frame of the seat possible with a junk yard one much cheaper than buying new and junkyard frames come complete.
SOURCE: 2002 Envoy Forward / Back seat motor no longer functioning
First of all did you check the fuses? There should be one for the seats. If they're ok then get a Haynes Repair Manual for your 02 Envoy it'll probably even have illustrations showing you how to do it. Its my best advice, you can get one from just about any auto part store.
SOURCE: electric seat motor switch...no move back
Cross the wires...from the switch to the motors...since the switch works one way, but not the other. Instead if cutting cable/wire, try a jumper (another wire) and cross the connection at the plug to the switch. I have same problem...I reversed switch as mentioned above, to move seat back.
SOURCE: driver's power seat not working properly on 2004 tahoe
it sound like you need to replace seat control switch
SOURCE: trying to fix drivers power seat in 01 subaru outback ltd ??
I just finished 'repairing' this in my '00 Outback wagon, which moved forward inconsistently,
and never completely lifted the front edge of the seat up. We like to move it back when we get out.
Up to now, we had learned we could move it forward by hitting it like a karate chop (not good) !
I removed the 4 bolts mounting the seat to the floor, tilted it back, popped the toggle switch handle off
& removed the 2 screws holding the side cover. (I discovered the switch WORKED now!)
I then disconnected the switch harness & bent the plastic cover back far enough to unscrew the
switch from the inside. I inspected & spray-cleaned the switch, & in re-installing discovered the switch front plastic lobe (or knob) that snaps into the handle was loosening
& finally broke off! It works just using the rear lobe without the handle on.
I left it hanging beside the seat for now until I order another switch. But, also, the rear inner screw that
mounts the switch stripped during attempted re-installation, which I will have to address.
Bottom line: it was a mechanical failure, not an electrical one! I could re-install
without the handle & it would work. Ugly.
Other bottom line: this was my teacher-wife's commuter car, I am inheriting it this summer when
our new 2010 Prius arrives! It has 190,000 miles on it ! magikmarty
2,506 views
Usually answered in minutes!
×