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Where can i locate a fuse for driverside lumbar seat because my seat will not adjust and i dont have the diagram

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where can i locate a fuse for driverside lumbar - 82b5858.gif
Battery Junction Box—2000–02 models




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Battery Junction Box information—2000–02 models

Posted on May 05, 2010

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2009 Buick Lucerne, power driver seat won't adjust on seat or through memory button. Passenger seat works fine. Heater for both seats won't turn on. Checked fuses and relays, all ok


Your best bet , have it checked for DTC'S - diagnostic trouble codes first ! Electronic control modules involved ! Can't check with a OBD 2 code reader , need advanced scan tool . No codes , check B+ voltage and ground to the module .
Power Seat Inoperative (With Memory A45)
Memory Seat Feature Inoperative
Circuit/System Description
Battery voltage is supplied at all times to the memory seat module (MSM) from the MDL-MEM 10A fuse located in the rear fuse block. This voltage is used by the MSM for logic power and to supply battery reference voltage to the seat and lumbar adjuster switches. Battery positive voltage is also supplied at all times to the MSM from the PWR SEAT 25A circuit breaker. This voltage is connected to a power rail internal to the MSM and is used to drive the power seat motors, lumbar motors, and seat heater elements on vehicles equipped with heated seats. Each seat and lumbar adjuster motor is controlled by the MSM through 2 motor control circuits. The MSM connects all motor control circuits on the power rail to a common reference point whenever they are not in operation. This reference point is biased to approximately 2.5 volts. The MSM checks to see if the reference voltage is shorted to ground or battery before enabling any of the seat or lumbar motors.

Circuit/System Description
Reference voltage is supplied to the memory switch from the driver door module (DDM). When a memory switch is pressed, reference voltage is applied through the switch contacts, a series of resistors and thorough the memory switch signal circuit to the DDM. The door module then sends a serial data message to the memory seat module (MSM) indicating the memory recall request. The MSM then commands the appropriate seat motors to move to the pre-recorded seat positions stored in memory in response to the switch input.

Sep 02, 2017 | 2009 Buick Lucerne

2 Answers

Driver seat not working


Beings it's probably a electric adjusted seat (you didn't state if so), it might be a fuse.

Apr 08, 2014 | 2007 Lincoln Navigator Luxury

1 Answer

How to repair the lumbar support in a 2010 sebring


The manual support linkage has become disengaged or may have broken. Check to see which is the case and make repairs

Sep 17, 2012 | 2010 Chrysler Sebring

1 Answer

I have a 2006 lincoln ls sport and the drivers seat is stuck in one position there is only power to the lumbar


The dirver seat module is attached to the underside of the seat frame. It must be calibrated if replaced. The dealer can use a tool to get failure codes (DTCs) from teh module. 1/2 hour labor charge to extract codes.


Front Seats
The front seats have the following features:
  • Driver memory
  • Power lumbar (optional)
  • Manual lumbar
  • Horizontal, vertical front and rear tilt adjustments (driver)
  • Horizontal, vertical front tilt adjustment (passenger)
  • Power recline
  • Climate controlled (optional)
Adjustment of the seat may be accomplished with the seat control switch located on the side of the seat.
--------------------------------------------------------------------
Principles of Operation
Driver Power Seat - Memory
NOTE: The memory power seat track may stall when operating at 0°C (32°F) or below. Once the vehicle's interior temperature rises above 0°C (32°F), normal operation should return.
The driver power seat is controlled by the driver seat module (DSM). The DSM does not need to be configured, however the driver seat does need to be calibrated when the DSM is installed. The driver seat control switch provides voltage to the DSM when activated. The NEUTRAL position of each driver seat control switch position is a ground state through the seat control switch contacts. A voltage input causes the DSM to power the appropriate motor until the input is removed. Ground is the normal state of the motor circuits through the DSM and is not switched to control the motors. The DSM internally switches the appropriate line from ground to power to adjust the motors.
As the seat is adjusted, the DSM constantly monitors the motor position sensors to record the current seat position. The DSM will remove power from the motor upon termination of the seat control switch input or if the DSM does not see movement from the motor by monitoring the position sensor. The DSM must be calibrated to the seat track it is controlling. For additional information, refer to Seat Calibration. Once the DSM is calibrated to the seat track, it will only allow movement within the calibrated range.
Seat Calibration
The DSM is calibrated using a diagnostic tool. The calibration procedure automatically powers the driver power seat through its full range of motion and records the FULL STOP positions by monitoring the motor position sensors. Once the FULL STOP positions or range of the seat have been recorded, the DSM will only operate within the calibrated range. Any input attempting to drive the seat beyond the calibrated range will be ignored. This calibration is used for all seat control functions including manual switch control and memory recall positioning. During the seat calibration, the DSM may identify a function that is inoperative, such as a position sensor not changing. If the DSM identifies a concern that has a related diagnostic trouble code (DTC), the DSM will set the related DTC at the end of the validation procedure.
The calibration procedure powers the seat track adjustments to the end of their travel, which is determined by the DSM sensing a change of state in the motor position sensors. If there is a concern with the seat track or motor position sensor that limits the travel, the DSM will interpret the stopping point as the end of travel and store the position. The DSM is not able to determine if the seat has moved to its FULL TRAVEL position. It is only capable of monitoring and storing the amount of travel seen by the position sensor changing states.
For additional information on carrying out the power seat calibration procedure, refer to the diagnostic tool operating manual.
Memory Seat
Memory seat positioning can be recalled with the memory switches on the driver door panel or a programmed remote keyless entry transmitter. In either case, the DSM receives a memory recall 1 or 2 command from the driver door module (DDM) over the SCP communication network. The memory recall switches are a hardwired input to the DDM. The DDM also receives the remote keyless entry transmitter signals. Once a valid memory recall command is received from the DDM, the DSM moves the driver seat to the position stored in memory by powering the appropriate motors and monitoring the motor position sensors until the position is reached.
This system allows automatic positioning of the driver seat to 2 programmable positions.
  • To program position 1, move the driver seat to the desired position using the seat control switch. Depress the set button. Within 5 seconds, depress button 1.
  • To program position 2, repeat the previous procedure using the set button and button 2.
  • To recall position 1, depress button 1. To recall position 2, depress button 2.
A position can only be recalled when the transmission selector is in PARK or NEUTRAL. A position may be programmed at any time.
Easy Exit/Easy Entry
The easy exit function moves the seat backwards about 2 inches when the ignition key is removed from the ignition switch. The DSM receives a key out command over the SCP communication network and powers the driver seat rearward. This function will not operate if the seat is less than the travel distance to the end of the track, or the function has been deactivated at the message center driver personality settings. The DSM will also cancel this operation if a valid input command is received, such as the seat control switch or memory recall request.
The DSM will record the current seat position before powering the seat for an easy exit function. This recorded position will be used to return the seat to this position on the easy entry operation. During easy entry operation, the seat is returned to the position previous to the easy exit operation. Easy entry operation will be cancelled if a valid input command is received by the DSM.
Passenger Power Seat
The passenger power seat motors are hardwired to the passenger seat control switch. The circuits are normally at ground through the seat control switch. The individual circuit is switched to power when the specific adjustment position is selected.
-----------------------------------------------------------------------------------------------------------------------------
Visual Inspection Chart Mechanical Electrical
  • Front seat track motors
  • Front seat track binding or obstructed
  • Front seat backrest power recline
  • Lumbar motor
  • Climate controlled seat ducts
  • Driver door module fuse(s):
    • Central junction box (CJB) fuse 7 (5A)
    • CJB fuse 22 (10A)
  • Driver seat module fuse(s):
    • Battery junction box (BJB) fuse 21 (20A)
    • CJB fuse 7 (5A)
  • Passenger power seat BJB fuse 28 (20A)
  • Rear heated seat fuse(s):
    • BJB 11 (20A)
    • CJB fuse 16 (5A)
  • Driver power lumbar BJB fuse 21 (20A)
  • Passenger power lumbar BJB fuse 28 (20A)
  • Driver and passenger climate controlled seat module fuse(s):
    • BJB fuse 26 (30A)
    • CJB fuse 16 (5A)
  • Seat control switch
  • Memory set switch
  • Lumbar seat control switch
  • Seat fan motor
  • Climate controlled seat module
  • Climate controlled seat switch

Jan 14, 2011 | 2001 Lincoln LS

1 Answer

Hi - I have a much loved 2004 SAAB 93 Aero sedan.


This has been happenning on my 2006 Saab 9-3 2.0 T also for about 2-3 months also. I have had no clues until today I learnt by accident that the lumbar support on my car's driver seat does not work anymore. Which means that there are broken strings/wires inside the seat and that move on braking and make clicking sound. I haven't checked my seat's lumbar support but will do soon.

Try your lumbar support adjustment and see if it is moving freely, that means it not adjusting the lumbar support. If that's the case, that may be the cause of the clicking/slight-movement of the seat.

May 09, 2010 | 2004 Saab 9-3

2 Answers

Driver's seat stuck. Lumbard support works,


HI. There are only two causes for this particular issue. The most common will be a failed switch assembly. This should be located on the side of the drivers seat. This switch is responsible for transferring the movement commands to the actual motor/gear assembly, which is located on the rail structure under the seat in question. If your lumbar section is responding to commands, but the others fail, this will lead to a failed switch circuit. the entire switch board will need to be replaced, in this case.

Now, if you command the set to move forward, and all you hear is the motor running , but no movement, this will lead to a failed gear assembly. This will be the second cause of no forward/backwards movement. In this case, the entire motor/gear assembly will need to be replaced, due to the fact that the gears are not sold separately. The are shipped as a kit with the motor.


It is required that you order this type of replacement part directly from the dealership.



  • NOTE_ I have seen in most cases that the there was jam, due to pieces of the gear assembly breaking off, and jamming up the mechanism. in order to properly inspect for damage of this nature, it will be necessary to remove the seat.

Mar 26, 2010 | 2002 Mercury Mountaineer

1 Answer

How do you adjust the lumbar support on a 2004 deville


some do some do not, on drivers side, approx. hip location, on side of seat, round control is located, press control for different positions of lumbar support

May 02, 2009 | Cadillac DeVille Cars & Trucks

1 Answer

Electric seats won't move The lumbar switch works all other do not


The lumbar may not be electrified at all; not much reason for it and the fuse servicing the seat adjustment may simply have died from metal fatigue; check your fuses. 

Apr 19, 2009 | 2000 Oldsmobile Bravada

1 Answer

The Lumbar support adjustment fails


I wonder if you dont have a bad switch. I had a similar problem on my car except that it was the heated seats that would not engage... the power seat buttons all worked just fine. I changed the switch and it fixed the problem...

Note: this was on a BMW not a Murano

Dec 31, 2008 | 2005 Nissan Murano

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