I believe switch works but lumbar doesn't do anything
SOURCE: 1993 Ford F150 4X4 Power door locks, power
CK FOR POWER TO LOCK @ WINDOW SWITCH IT COMES FOR MASTER WINDOW SWITCH ON LEFT SIDE DOOR NOT SHORE ON LUMBAR CONN.UNDER SEAT CK IT FOR POWER
SOURCE: No lumbar support
There are several problems that could exist. Firstly I would check the fuses. If all are good, either the knob has quit working, or the motor that increases and decreases the support has gone out. If you can find the positive and negative wires going from the wheel to the motor, you can test it with a voltometer. You would have to have a manual to identify the wires. But if you can, test to see if the knob is sending an electric signal to the motor in the seat. If there is a signal going through, the motor is out. If there is not a signal going out, the knob has probably gone out. Hope this helps.
SOURCE: drivers seat lumbar not working passengers seat
failure of adjustable mechanism or slipping of handle
SOURCE: lumbar bladder loses air
you will need to take it to an upholsterer - have them remove the skin of the seat and install a new one - then put the seat back in.
SOURCE: driver side power seat does
you must look for loose wire, clean contac switch, and finally the switch will be faulty.
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