I bought a 2021 Ford F150 Limited hybrid used from a friend of mine about 6 months ago. Everything worked fine until about 2 weeks ago. While on a road trip, the active motion feature on the passenger seat only quit working. A push of the round button on the seat or an attempt to activate the feature on the touch screen would not start the massage feature. The driver's seat works fine. No issues.



The touch screen just shows the seat “grayed out” when trying to get the passenger seat to activate. Again, the driver's seat works as designed. All other features on the passenger seat work as designed like the heat and ventilation and seat movements. If I had to venture a guess, it is as though the passenger weight sensor in the passenger seat thinks no one is seated in that seat, thus the feature remains in the off position. Is there a passenger weight sensor (in addition to the air bag weight sensor) in the passenger seat specifically designed to work with the active motion feature of the passenger seat? If there is, is there an easy way to disable that weight sensor, like unplugging it or using some sort of a jumper wire in a connector? If it exists, where is it? What does it look like? Can I unplug it to disable it? Does anyone have photos or diagrams to help me locate it under the seat?



I have removed the electrical connector to the SCMH and checked for bent pins and corrosion. All appears OK. I also checked the wiring to the SCMH for damage or other issues. Again, all appears OK. I've checked under the seat for wire damage, electrical plugs not seated, or any other obvious issues with negative results. All seems OK.



I have made certain all the fuses in both fuse boxes are fully seated although I could not find a fuse directly dedicated to the operation of the active motion feature on the passenger seat only. Again, all appears OK.



I'm at a loss. What is causing the passenger seat only failure of the active motion option? I need help before I go to the dealership.

 

Welcome to the forum.

 

sounds silly, but were you sitting n passenger seat? I think it may only work when senses someone sitting in it. As I know when my wife jumps out of the passenger seat it turns off. If I recall.

 

Each time I changed something and then tested, I always sat in the passenger seat. From what you said, it appears there IS a passenger weight sensor in the seat that will render the active motion seat inoperative IF there is no one seated. That seat sensor may be my problem.

 

Unfortunately I had to take my F150 to Ford for the fix. Per the tech, the passenger seat air pump for the active motion seats shorted out. In doing so, that pump apparently also took out the "seat module" (I'm assuming he meant the SCMH) as well. Ford is currently awaiting a parts shipment to fix my issue. There doesn't seem to be a reason for the pump to short out, nor is there an explanation as to why that circuit wouldn't be protected by a fuse to prevent collateral damage, like destroying the SCMH. There also doesn't seem, at this point in time, to be a reason that the air pump short would directly (electrically) destroy the SCMH. .If anything changes regarding the cause of the air pump short, how that short ruined the SCMH, or what wiring might also be involved, I'll respond here. If anyone out there understands this system and can shed light on what might have happened to my truck, I would love to hear their opinion. I'm not sure Ford is being completely upfront with me. Also, if this pump failure is a common issue with these seats, that would be important to know as I deal with Ford. Just to clarify, per Ford, the pump failure did not send debris into the SCMH, but ruined that module electrically, not physically.