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How to replace broken power seat drive shafts
 
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Pelican Technical Article:

How to replace broken power seat drive shafts

Time:

1-3 hours

Tab:

$100

Talent:

*

Tools:

Phillips head and flathead screwdriver.

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

Flexible drive shaft for power seats.

Performance Gain:

Restores forward and reverse adjustment of power seats.

Complementary Modification:

None.


Flexible seat shaft part number 928.521.252.04 (same for both side)

When the power seats fails to move forward and backward in a 993 it is most likily either a bad switch or a stripped flexible drive shaft.  This DIY will focus on how to replace the flexible drive shaft. 

(1). Remove the two philips screw that holds the cover the covers the drive motor in front of the seat.

(2). Remove the drive shaft clip from the motor

(3). Slide the plastic wrap along with the flexible drive shaft cable out of the motor drive mechanism

(4). Remove the drive shaft clip that secures it to part of the frame of the seat. 

(5). Pull the plastic sleeve out and the shaft out of the seat drive gear box on either side

(6). Install the new shaft and line it up with the motor drive gear, you may need to tap on the power seat switch to get the square notch to line up while you install the shaft to the motor.  When installing the shaft to the seat's drive gear make sure that it is pluged all the way in, you may even want to turn the shaft with your fingers to make sure it is mounted correctly before attaching it to the motor.
 
 

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Comments and Suggestions:
luvair Comments: Anyone know where I can get this wire that attaches from the seat into the motor? Its for a 964. Thanks.
April 15, 2016
  Followup from the Pelican Staff: From Pelican Parts. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Hassan Comments: Hi nick thanks for the reply since im not from usa i dont think it would connect with the number u gave me. It would be great if i can find the repair part since it quite hard to find.
Thanks again
September 22, 2015
  Followup from the Pelican Staff: Try using our part browser. http://www.pelicanparts.com/Porsche/index-SC.htm - Nick at Pelican Parts  
hassan Comments: hi i have the same problem with george sept 14 question..does it fit on mercedes w204 because i would like to purchase the shorter one if available.

Thanks
September 15, 2015
  Followup from the Pelican Staff: I'm sure we can get the right one for your vehicle. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Aaron Comments: Thank you for the write-up! If I have a disassembled seat, how would I ensure that all the lifting mechanisms are at the same height before re-attaching all the cables? Do they just extend until they completely bottom out? - so should I extend them all fully then reattach the cables? thank you.
June 6, 2015
  Followup from the Pelican Staff: Yes, get them in a stop position, either up or down. - Nick at Pelican Parts  
JCG73 Comments: Thanks Nick!
Collectively I used all the advice from this thread, and I was able to fix the power seat myself with a new flexible shaft from Pelican Parts. I also used a little carefully directed W-D, and now the seat moves as new! So nice to be able to DIY rather than put the car in the shop for such a seemingly minor issue.
March 18, 2015
  Followup from the Pelican Staff: Thanks for sharing your installation process and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
JCG73 Comments: I just experienced the same issue with the driver's seat in my new to me 21,000 mile 1996 993. Some genius had replaced the clutch pedal pad, but tossed it under the driver seat, where there is no clearance. So, when the next person moved the driver seat, the loose pedal pad caught the flexible shaft and pulled it free from the drive gear so it appears.
However it is trickier than it seems to get the square cable tip to slide back into the drive mechanism. I tried to toggle the switch to line them up, but in the process I stripped the end of the flexible driveshaft, and now I need a new one.
Any advice on getting the two to line up and move into place properly? I will be trying again after I order the new flexible driveshaft.
February 10, 2015
  Followup from the Pelican Staff: Best bet, use a mirror and a square drive bit, manually move the motor and drive until they line up, then insert the cable. See attached for bit type. - Nick at Pelican Parts
Tung Comments: How many pieces of flexible seat shaft will be needed per car? My car 1994 chassis no. WPOZZZ99ZRS331392 convertible
February 9, 2015
  Followup from the Pelican Staff: Seems like two for the vehicle, one for each side. To be sure, give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need. - Nick at Pelican Parts  
Lance Comments: To move the seat I used a cordless drill attached to the cable and pushed the switch at the same. Without the drill the seat would move about 1/2" bind and stop. You just have to watch while the seat is moving and play with the drill and switch so the seats does not bind on the rails. It works both forwards and backwards.
January 2, 2015
  Followup from the Pelican Staff: Thanks for sharing your installation process and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
K Nguyen Comments: Thanks nick any particular size square drive bit??
September 6, 2014
  Followup from the Pelican Staff: I am not 100% sure. You'll have to pull the cable out, then match it up to a bit. - Nick at Pelican Parts  
George Comments: Do you do these types http://www.pelicanparts.com/techarticles/pcar_com/power_seats2.htm for a mercedes w204. one side is long and the other is short. i need the short side
September 3, 2014
  Followup from the Pelican Staff: We should have them. Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
K Nguyen Comments: Thanks Nick, the drive cables are twisted and will not go back. I tried turning the drive cable end that is still in the seat rail and it seems jammed or just not enough leverage. Is there any other way to get the seat to move? Are there any bolts under the seat that can be removed to loosen seat to get forward and backward motion Thanks
September 2, 2014
  Followup from the Pelican Staff: Not really. You may have to pull the cables out, then turn the drive with a square driver bit. - Nick at Pelican Parts  
King Nguyen Comments: Hello Nick, I have a 2007 997 Carrera with full power passenger seat. The seat is stuck in and will not move forward or backward. I looked under and the drive motor with the cables are disconnected on both sides. I also noticed that the frozen side still has the drive cable stuck in the side of set rail still. Since I cannot access the 4 torx bolts to remove the seat is there any other methods I can do to free the seat so I can get to the 4 torx bolts?? If I remove the drive cable that is still stuck into the seat rail would that free the seat so it can move freely back and forth giving me access tot he 4 bolts? Much help needed thanks! I am a customer and think you guys are great!
August 29, 2014
  Followup from the Pelican Staff: If the cables are detached, resintall them, then manually power the motor using a ground and fused jumper wire to power. If the motor is dead, you may have to remove the drive cable and run them by hand to move the seat. This will not be easy as it is a tight fit. - Nick at Pelican Parts  
Dragonyen Comments: My 1996 Porsche 993 convertible front driver and passenger car seats moved slightly every time the brakes are applied. Something loose in the power seat mechanism. Do you have parts to replace for worn out parts like defective bush that needs replacement?
January 7, 2014
  Followup from the Pelican Staff: There could be a faulty bushing or drive unit. The seat will have to be removed and inspected.
Give out parts specialists a call: 888-280-7799, They will help you find the right parts. - Nick at Pelican Parts
 
jade Comments: where can i find a porsche
seat motor drive shaft
November 14, 2013
  Followup from the Pelican Staff: Not sure what year or model Porsche you have.

Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Mike Comments: My name is Mike Bulpitt in Springfield Il. I have a 2008 Dodge , 2500. Power seat drive cable is broken for the driver side forward and reverse. Would you have a drive cable to fit this application. If you need to call me my number is 217-306-6848. Look on the web to find you. Thanks Mike
September 8, 2013
  Followup from the Pelican Staff: Not sure if we can get domestic parts. Give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 
Bob Comments: Hi there, very informative but was wondering if it is the same for the REAR height adjustment.My LHS seat front adjustment works fine the adjustment for the rear of the seat is not working.....I can hear the motor spinning so assume that it is the shaft....would you have the part no please. Thanks.
April 15, 2011
  Followup from the Pelican Staff: Yes, it should be similar. Our sales staff can get you the part you need (you didn't mention what car exactly you have). Drop them a line in our Message Center: http://www.pelicanparts.com/support/ContactUs.htm and they should be able to assist you. - Wayne at Pelican Parts  
Gregg Comments: How do you remove the wires for the forward/backward power seat switch from the little plastic "junction box" under the driver's seat? 1996 911 c2cab. thanks
June 13, 2010
  Followup from the Pelican Staff: There is one large slide and lock connector. Then you have to unbolt the seat module, unplug the connectors from the seat module. - Nick at Pelican Parts  
Ned Comments: Thanks! You just saved me some money and gave me a small project. The power seat drive shaft had slipped out of the motor drive. A quick fix once you showed me what to look for.
December 12, 2009
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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