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Old 25th July 2018, 19:34   #11
klarzy
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Quote:
Originally Posted by Rsnail View Post
Tried again the battery trick with the amp completely disconnected, not a single thing changed... Looked in the boot spare wheel well and I can't see ANY connector in there, just a rubber grommet and a cable bundle going through it kind of on the left outer car part of the well, also, no signs of water in there. Also, pulled the cover away from the right side of the boot, and noticed that there are 2 connector that are not connected to anything, one blue and one red, they have the same shape as the 2 that go into the sat nav unit, those are also there and connected to the sat nav, one blue and one pink, but I never touched them before and the seats were also working properly so I don't think it has something to do with that.

I looked again at all points where I ran the cables for the amp when installing it, all looks clean to me so I'm kinda standing here clueless and it's really annoying

EDIT: Looked a little bit deeper into the RAVE CD for the memory seats system description and figured out some things, the communication between the 3 memory push buttons and the seat memory ECU is intact, because 1st: it can store new memory positions, and 2nd: did a seat memory self test mode and that also confirmed that the buttons are communicating with the ECU. Now, the problem is, as far as I can see, the ECU receives the command from one of the 3 push buttons when they are pushed, but somehow, doesn't send it forward to the motors, also, if a relay inside the ECU would be faulty, it says that it would show on diagnostics, and I am pretty sure that either my Toaf or Delphi would've picked them up. Another thing that I don't know, is that the ECU communicates with the BCU also, but doesn't state for what, my guess is that only for the lazy seats part of the system, because the memory seat positions are stored in the seat memory ECU, and also, regarding the K bus, how can I know if that really is the issue for my problem? Can I measure the K bus wire somehow and tell if it works by measuring it's voltage for example? And also, what is the role of the K bus wire for the memory seats in my case and what would happen if it wouldn't work properly?

AFAIK the k-Bus is used to take the remote signal from the EWS / remote receiver and tell the memory seat ECU which key is being used to open the door and thus which default position to move the seat into.

if the only think you have done is fit an amplifier then please recheck the wiring connections as a voltage drop may be causing this...
IIRC if the kbus voltage goes too low then it stops communicating and may cause issues with windscreen wipers and indictors etc...

the car stereo is also on the k-bus so this is possibly the root of an issue if the wrong wire is connected
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Old 25th July 2018, 20:11   #12
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I have a similar issue (going on for two years now - I am not that bothered that the memory doesnt work, since I am the sole driver)

After discovering the wiring present, I obtained and fitted a set of electric memory seats. (into a mk2 ZT diesel auto). I have an aftermarket stereo initially Kenwood, and latterly Alpine, with a single 4 channel amp. The seats were fitted after the amp and Kenwood stereo. They were plug and play. Memory, heat and electric operation were all fully operational. They still operated after the Alpine was installed, and power cable for the amp re routed.

I assume them to have remained operational until I had the crank pulley and injectors replaced. I know it was put onto a T4 at the time, as the map was adjusted. It was about a fortnight after I discovered the memory was not operational. I didnt contact the guy that did the work (he is a very trustworthy and capable specialist) as since it didnt bother me, I didnt want to disturb him lol, and besides I can assume it just as possible to be a coincidence.

I have read up, and it seems the memory ECU can be a possible issue - non memory apparently do not have the ECU (?). A couple of weeks ago, I serviced it, and resetting the oil service indicator with Phil's IPK tool, I started up TOAF to have a look at it. All seat functions were accessible on TOAF. The seat ECU showed the VIN from the car they came from, and I did not know if or how I could change it (but it shouldnt matter since it worked previously, unless the T4 has seen an issue with the mismatch and disabled it?)

So is it possible that T4 has disabled it due to the mismatched vin? or could it be a seat ECU issue on RSNAIL's car, with the kbus being a coincidental and additional issue?
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Old 25th July 2018, 20:25   #13
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Quote:
Originally Posted by clf View Post
I have a similar issue (going on for two years now - I am not that bothered that the memory doesnt work, since I am the sole driver)

After discovering the wiring present, I obtained and fitted a set of electric memory seats. (into a mk2 ZT diesel auto). I have an aftermarket stereo initially Kenwood, and latterly Alpine, with a single 4 channel amp. The seats were fitted after the amp and Kenwood stereo. They were plug and play. Memory, heat and electric operation were all fully operational. They still operated after the Alpine was installed, and power cable for the amp re routed.

I assume them to have remained operational until I had the crank pulley and injectors replaced. I know it was put onto a T4 at the time, as the map was adjusted. It was about a fortnight after I discovered the memory was not operational. I didnt contact the guy that did the work (he is a very trustworthy and capable specialist) as since it didnt bother me, I didnt want to disturb him lol, and besides I can assume it just as possible to be a coincidence.

I have read up, and it seems the memory ECU can be a possible issue - non memory apparently do not have the ECU (?). A couple of weeks ago, I serviced it, and resetting the oil service indicator with Phil's IPK tool, I started up TOAF to have a look at it. All seat functions were accessible on TOAF. The seat ECU showed the VIN from the car they came from, and I did not know if or how I could change it (but it shouldnt matter since it worked previously, unless the T4 has seen an issue with the mismatch and disabled it?)

So is it possible that T4 has disabled it due to the mismatched vin? or could it be a seat ECU issue on RSNAIL's car, with the kbus being a coincidental and additional issue?
I don't think the vin so much as the ZCS coding
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Old 26th July 2018, 04:15   #14
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Well, the ONLY "modification" I made for the radio (I have an android radio which didn't ever disturb the memory seats evem after having it installed for 1 year) is that I cut the blue wire of the 17 pin loom of the radio for the amp to receive the AUX signal and start when the key is in AUX position, that is a normal 12v wire that only gives the amp the signal to start and I can't imagine how that would disturb the seat memories. Also, as I said, I disconnected the amp completely, left the car more tham half an hour disconnected from the battery, than connected the battery without connecting the amp wiring to the battery, still, memories not working.

Also, when unlocking the door and if the seat is in another position than normally set with the key in the ignition, it doesn't move amymore to it's default position set by me like before, so the lazy seat function is also not working anymore
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Old 26th July 2018, 05:59   #15
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I had a similar problem with my seats the memory button beeped but the 3 buttons did nothing.
Turned out the seat ECU was faulty, got hold of another from Mickeyboy and not had any problems since.
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Old 26th July 2018, 09:18   #16
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So you're saying you've had the exact problem like me and the fix for that was a ECU replacement? I'd try to do that also because I was thinking that if the motors work, the memory positions can be stored, the only problem is in between which would be the ECU... Now it could also be a K bus problem or something similar but I really don't know how the K bus system works and can't say if it really is that or not
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Old 26th July 2018, 12:20   #17
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That's what I did, for the price it cost I thought it was worth ago.
After reading on the forums different threads I came to the conclusion it had to be that.
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Old 27th July 2018, 08:57   #18
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I'll try unplugging the connectors and then connecting them back in again, hope it'll work, if not, I'll also try replacing the ECU unit of the seats, now I remembered, when I installed the amp, I've had the plus wire already connected to the battery, and then I accidentally pulled the wire out of the glass fuse that is connected to the power wire of the amp and burned the end of the wire that goes into the fuse a little bit, maybe that had also to do with disturbing the system, I can't really imagine how because all the current went to the car's body metal ground, maybe the + original wire of the car that is connected to the battery picked up that huge battery power loss caused by the short of the amp wire and screwed up the system of the seats... I can't know this for sure, was just saying
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Old 27th July 2018, 09:25   #19
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Unfortunately the slightest thing can trigger problems & these things can just fail for no apparent reason.

When I converted a drivers height memory seat to the passengers side the memory function worked fine when I took the seat from the donner car, but when I put it all back together, Nothing.

Changed the Control unit & it all worked fine. I'd not played around with it, it just stopped working.

Change the Control unit for a known working one, then if there's still an issue check the wiring working back from the seat.

Good luck with it.

Regards

Paul
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Old 14th January 2020, 19:17   #20
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Hello everybody after a year and a half not updating this thread lol. So as I said, bought the memory seats ECU a year and a half ago and decided to do the 15 min job to swap it today lolll. Done that together with fixing the airbag connector from under the passenger seat, which was an eaxy fix, just tightly wrapped one cable tie around the connector to firmly hold it in place and error doesn't appear anymore regardless the seat position. So to get back at the memory seat ECU; replaced it, now it seemed that the memory seats won't store new positions and would only move to positions set before on the donor car. Gave it up and fixed the seat back in position again. After 2 hours drove the car and just thought well let's try and set a position, and voila! Surprisingly, I could all of a sudden store positions and also move the seat to the stored positions by preasing the position buttons. So the problem was indeed the memory seat ECU.
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