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W140 - MCS (lumbar) - no pressure from PSE
Hello,
I have a 1998 S320 where I cannot get the lumbar support to function. Since this has not ever functioned in my possesion of the car, I do not know if the rest of the system after the PSE pump is faulty or not (bladders in seats, switches, lines and reservoir in trunk). My problem is, that I do not get the PSE to pump on that line at all. All other functions of the PSE, like Central locking, head rest release, trunk handle retract, A/C Rest supply works fine. I have even dismanteled the PSE pump (great device:-)!) to see if there was any obvious faults like stuck piston, etc; (click on it to get a larger one) This is a more closeup of the switch for the MCS (lumbar) pressure. When pressure is reached, the piston slide down and opens the contact under det disc; There seems to be nothing wrong with the mechanical operation of that switch, but like I said, I cannot get the pump to operate at all. I know that the PSE is connected to the diagnostics module, but sould not the error code (if the problem is a error code) be gone after I have disconnected the battery? Or is the diagnostic module telling the PSE pump not to operate the lumbar? Do I have to get a dealer to enable it? I think the lumbar pump should be active 4 seconds after the engine is turned on? Or after ignition is turned on? As I can see, no other electrical switches regulate the lumbar? br, syljua W140 S320 1998 |
#2
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try the fuse to reset
syljua,
I believe that pump learns about each circuit, either vacuum or pressure. If it cannot acheive its goal in some time period ( not sure how long) it will mark that circuit as inactive. I have heard if you take out the fuse ( #9 in the trunk fusebox) for 30 or so seconds, it will reset the disable. THe longer term question is why didn't it work in the allotted time. That is sometimes a weak pump, or it could be other causes like a leak. Chuck |
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