Passenger Power Seats

[dottie62]

I have power seats with lumbar control which both operate from the center console. The driver's seat works perfectly fine. However, for the passenger seat I can only operate the lumbar controls. Everytime I try to operate the seat positioning, it moves the drivers seat respectively. Anyone have an idea what's happening here and how to fix it?

[human]

I don't know for sure, but it sounds like the left/right selector switch may be malfunctioning.

[dottie62]

If it is the left/right seat selector malfunctioning, any idea what is involved to repair (labor/cost). Or if it may be something I can attempt on my own.

[willwren]

The first thing to do is pull it out and disconnect it. Examine the plug carefully for anything that might be shorted. Does the switch move freely, or feel sticky?

[dottie62]

The switch does move freely from left to right. The lumbar does work for the passenger but nothing else. If I select the passenger seat (r) and attempt to move the seat, the driver seat (l) moves.

[Icebound]

According to the schematic, the lumbar electrics and the motion electrics are handled completely separately.

On the lumbars, the Left-Right switch provides power DIRECTLY to the lumbar switch, which in turn powers the appropriate air valve (and the pump).

For the motion motors, this same left-right switch appears to trigger a "left-right-select-RELAY". It is possible that relay is not activating.

The seat motion switches also do NOT directly supply power to the motors; they just trigger a relay which powers the appropriate motor... plus the appropriate "back" or "forward" direction-control relay. All of these relays are shown as part of a "seat control module", which is supposed to be "under LH front seat"...

For your symptom, most of the trouble-shooting ends up with "replace seat control module"

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