2001 SLS Lumbar adjustment troubleshooting

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Cadillac Seville / Cadillac Eldorado Forum Discussion, 2001 SLS Lumbar adjustment troubleshooting in Past Cadillac Vehicle Discussion; Where can I find some info on troubleshooting the drivers side lunbar adjustment circuitry?? The switch does nothing, not up ...
  1. #1
    wrig456 is offline Cadillac Owners Member
    Automobile(s): 2001 Seville sls
    Join Date
    Mar 2010

    2001 SLS Lumbar adjustment troubleshooting

    Where can I find some info on troubleshooting the drivers side lunbar adjustment circuitry??
    The switch does nothing, not up and down or in and out.

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  3. #2
    curtc's Avatar
    curtc is online now Cadillac Owners Master
    Automobile(s): 2006 STS V8 1SF RWD
    Join Date
    Jul 2005
    Oakdale, MN

    Re: 2001 SLS Lumbar adjustment troubleshooting

    You are in the wrong forum wrig...Try posting over in the Seville/Eldorado forum for better assistance

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it .......
    Automobile(s): 2002.5 F55 STS - 66500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: 2001 SLS Lumbar adjustment troubleshooting

    Moved - one day redirect left in "STS".

  5. #4
    N*Caddy's Avatar
    N*Caddy is offline Cadillac Owners Master
    Automobile(s): 1997 Cadillac STS (BOSE w/AUX In, Massage Seats, URPAS, "Z")
    Join Date
    Nov 2006
    Toronto, Canada

    Re: 2001 SLS Lumbar adjustment troubleshooting

    Start with the switch.
    I guess form your post the other seat controls work fine so MSM gets power.
    There are 2 motors actuating the lumbar movements:
    Vertical and horizontal (in/out).
    Each motor has a sensor (variable resistor ~10KOhm = potentiometer) and as the motor moves the sensor resistance varies from ~100Ohm to ~10KOhm.
    Even with the sensors disconnected (or malfunctioning) the movement should still happen as long as you use the buttons (but memory feature may not work correctly). You should have MSM codes if the sensors are problematic.
    So you have 5 wires to the lumbar switch (supply and 4 returns up/down/in/out) and these are all connected to the MSM (located underneath the seat. Then form the MSM you have a 10 wire harness going to the lumbar adjustments (2x2 wires for the motor power and 2x3 wires for the sensors).
    Either the harness going to the lumbar motors is having an issue or the lumbar adjustment switch or the harness to it has an issue.

  6. #5
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Cadillac Eldorado ETC
    Join Date
    Aug 2010
    Kennewick WA
    I keep getting the MSM B2119 code on mine

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