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DaddyPax
Newbie


Joined: 24 Mar 2019
Posts: 14
Location: Newcastle upon Tyne


PostPosted: Thu Aug 08, 2019 6:17 pm    Post subject: Automatic Seat Problems - Won't go up from recline position Reply with quote

Hi there,

Apologies to those who may feel like this is groundhog day but I was hoping to get some input on a problem I've just encountered in my 2005 997 C2S. It has electric seats and all has been fine since I got hold of the car a few months back. Last week, whilst driving, my passenger reported that they were unable to recline/upright the seat. Forwards/backwards, up/down and the lumbar were all fine.

I took a look later int he day and found that the recline function had worked but the uprighting was not. As a result I currently have an overly-reclined passenger seat and cannot upright it. All other electric seat functions on both sides are operating OK, it is just passenger side uprighting that doesn't respond.

I've looked under the seat and all appears to be in order. I assume the motor that reclines is the same one that uprights but the cause of not being able to go one way is a mystery. Any support or signposting would be hugely appreciated.

many thanks,

DP.
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7287
Location: Brighton


PostPosted: Thu Aug 08, 2019 6:55 pm    Post subject: Reply with quote

My guess would be a faulty switch .. you would need to start checking the wiring from the switch to the control unit .. that's basically seat out a wiring diagram and a continuity check .

As all the other functions are ok then that rules out any power supply problems .

LV is the motor , it can be power probed to operate but you would need to do this when disconnected to the control unit .
_________________
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My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

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seat-1.jpg
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seat-1.jpg


  
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DaddyPax
Newbie


Joined: 24 Mar 2019
Posts: 14
Location: Newcastle upon Tyne


PostPosted: Thu Aug 08, 2019 7:42 pm    Post subject: Reply with quote

deMort wrote:
My guess would be a faulty switch .. you would need to start checking the wiring from the switch to the control unit .. that's basically seat out a wiring diagram and a continuity check .

As all the other functions are ok then that rules out any power supply problems .

LV is the motor , it can be power probed to operate but you would need to do this when disconnected to the control unit .


thanks. removing the seat feels like a potential can of worms! Do you know if there's a way of manually uprighting the seat in the meantime?
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7287
Location: Brighton


PostPosted: Sat Aug 10, 2019 3:27 pm    Post subject: Reply with quote

Its an electric motor with no manual option im afraid .

If it was me i would probably pull off the switch cover and just try to press the switch direct .. sometimes it's just this cover that breaks .
_________________
.

My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 
  
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DaddyPax
Newbie


Joined: 24 Mar 2019
Posts: 14
Location: Newcastle upon Tyne


PostPosted: Sun Aug 11, 2019 7:01 pm    Post subject: Reply with quote

deMort wrote:
Its an electric motor with no manual option im afraid .

If it was me i would probably pull off the switch cover and just try to press the switch direct .. sometimes it's just this cover that breaks .


thanks, I just tried that but everything's intact. Upon removal, I can still recline the seat with the little white switch but a forward movement yields nothing. Very frustrating, passenger seat now as good as unusable.
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7287
Location: Brighton


PostPosted: Sun Aug 11, 2019 7:24 pm    Post subject: Reply with quote

Im afraid its a seat out and diagnose at this point .. i was hoping the white switch would move it .
_________________
.

My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 
  
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DaddyPax
Newbie


Joined: 24 Mar 2019
Posts: 14
Location: Newcastle upon Tyne


PostPosted: Fri Aug 23, 2019 8:21 pm    Post subject: SOLVED!! Power Seat Adjustment Problems Reply with quote

Thanks to everyone who contributed. I finally identified the route cause tis evening and fixed it. Read on.

As advised above, I first of all got my multimeter out and did a continuity check on all the 18 cables coming out of the switch and going to various parts under the seat. All passed.

I then removed the switch and dismantled it. On the reverse I founf the issue. The track from the switch was broken. I can only assume it had previously been overloaded with volts (not sure how this might have happened). Anyway, soldered the track back together, reassembled and everything worked. I was nearly sick with excitement.

I love Porsches!
Pics below.
 



soldered_track.jpg
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My (shabby) track repair. I may revisit this with a shielded wire but for now, the seat is back up and everyone is smiling.
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broken-track.jpg
 Description:
The back of the PCB showing the broken track
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broken-track.jpg



switch.jpg
 Description:
the PCB inside the switch once I'd removed it.
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switch.jpg



under-seat.jpg
 Description:
the 18 wires go to various points under the seat. motors, power etc.
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under-seat.jpg



switch18x.jpg
 Description:
the 18 cables coming form the switch. I continuity checked all these to rule them out as problem areas.
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switch18x.jpg


  
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Zoto
Newbie


Joined: 28 Mar 2016
Posts: 2
Location: Perth, Western Australia


PostPosted: Fri Aug 23, 2019 11:43 pm    Post subject: Reply with quote

Well done for finding and fixing the fault - and excellent photos.
The damage to the pcb track was due to excessive current and not voltage. To be honest surprising that the fuse didn't blow before this damage occurred. In the end the pcb's track failure acted like a fuse.

It might be worth checking to make sure someone previously hasn't fitted a larger than specified fuse (avoid same problem happening again ….or worse).
 
  
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DaddyPax
Newbie


Joined: 24 Mar 2019
Posts: 14
Location: Newcastle upon Tyne


PostPosted: Sat Aug 24, 2019 6:48 am    Post subject: Reply with quote

Zoto wrote:
Well done for finding and fixing the fault - and excellent photos.
The damage to the pcb track was due to excessive current and not voltage. To be honest surprising that the fuse didn't blow before this damage occurred. In the end the pcb's track failure acted like a fuse.

It might be worth checking to make sure someone previously hasn't fitted a larger than specified fuse (avoid same problem happening again ….or worse).
thanks Zoto. Will do.
 
  
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Magic919
Suzuka


Joined: 05 Jun 2013
Posts: 1241
Location: Berkshire


PostPosted: Sat Aug 24, 2019 7:23 am    Post subject: Reply with quote

Well done. Must be satisfying sorting it that way.
_________________
997.2 C4S PDK
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7287
Location: Brighton


PostPosted: Sat Aug 24, 2019 6:26 pm    Post subject: Reply with quote

Excellent repair .. it will do the job and not need to be revisited i feel .

I think you are somewhat more talented than you let on young man Very Happy
_________________
.

My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 
  
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DaddyPax
Newbie


Joined: 24 Mar 2019
Posts: 14
Location: Newcastle upon Tyne


PostPosted: Sat Aug 24, 2019 6:58 pm    Post subject: Reply with quote

deMort wrote:
Excellent repair .. it will do the job and not need to be revisited i feel .

I think you are somewhat more talented than you let on young man Very Happy


Thanks for the plaudits although, a week ago, I didn’t know how to use a multimeter! It’s amazing what you pick up on forums and YouTube and the inputs from guys on here set me in the right direction.

The switch part costs around £500 online which is ridiculous when you know what it comprises (about a quid’s worth of parts) but I guess they’re past end of line. I’m pleased I didn’t need to put my hand in my pocket for this one. The seat removal was staggeringly straight forward (oddly other son forums talk of this like its a monumental challenge) then it’s just screws and patience to dissect everything.

I must confess, the sense of jubilation was off the scale when it worked!!!
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7287
Location: Brighton


PostPosted: Sat Aug 24, 2019 7:06 pm    Post subject: Reply with quote

Yup .. seat removal is 4 bolts and unplug a bit of wiring .. hard part is lifting it out of the car without scratching anything lol .

Im now even more impressed .. your a quick learner that's for sure !

I Know many mechanics that would struggle to find this fault so credit where its due i feel .

The repair .. that's fine unless there's an underlying fault causing an overheat .. a jammed or sticking motor perhaps .. passengers side rarely gets altered so its possible i guess .

The repair though .. i've done similar and it's a permanent repair .

Porsche parts .. hmm .. expensive is an understatement to be honest.

Now you know why i still do this job after 37 years .. the buzz of finding a fault and then fixing it .. the rest is just nuts and bolts .. the challenge is the fault finding Very Happy
_________________
.

My Daughter's Crowdfunding has hit the target see Here

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Now At An Indy.
 
  
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DaddyPax
Newbie


Joined: 24 Mar 2019
Posts: 14
Location: Newcastle upon Tyne


PostPosted: Sat Aug 24, 2019 8:55 pm    Post subject: Reply with quote

deMort wrote:

Now you know why i still do this job after 37 years .. the buzz of finding a fault and then fixing it .. the rest is just nuts and bolts .. the challenge is the fault finding Very Happy


Smile Thanks again for your help!
 
  
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James M-S
Suzuka


Joined: 11 Apr 2017
Posts: 1076
Location: Derbyshire

2009 Porsche 997 Carrera 2

PostPosted: Sat Aug 24, 2019 10:38 pm    Post subject: Reply with quote

Hats off to you sir Thumb worship
_________________
Manual 997.2 c2 :Basalt + gtechniq : H&S + Gundo
 
  
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