Hi all,

Sorry for the long post but please stick with it haha, i think i know the answer but looking for a bit of reassurance or a fresh idea!

My steering wheel adjustment stopped working as in it will move a bit then stop, if I try to move it again it just does the same thing. I initially thought the column was at fault but then I noticed the drivers seat does exactly the same when I try to adjust it in any direction.

After looking at rave & googling found that the driver seat ecu looks like the culprit, I have an iid tool so did a scan & found k bus failure to driver seat ecu... At this point I carried out a rescan of all ECU's (not a read code) & the driver seat ecu is now no longer listed so looks like it has completely failed.

So checked the fuses, all ok, took the ecu out yesterday, all the connections look good, did a continuity check from the bcm to driver seat ecu kbus wire, which was fine. ( looks like ecu fault)

I opened the ECU but no obvious signs of damage, so put it all back together and connected it back to the car with only the 15way connector & the seat function is still the same. ( there may be 1 relay failed but not 100% convinced & for the price of a single relay can virtually pick up a second hand ecu)

So I reckon it is the driver seat ecu, but a bit concerned by the kbus issue & wondering if it could be the bcm as that stores & controls seat function! Has anyone got any similar experience or other ideas?

Thanks for reading if you did haha.

I have just encountered the very same issue minutes ago. I have no drivers seat adjustment at all and the steering wheel had lost it's movement also. I have not checked anything yet but a point in the right direction would be a big help.

I would start by checking fuses 20 & 23. (30a & 7.5a)

If you have no movement it could be a blown fuse, if it has blown replace it & see if it goes again when you try to adjust your steering or seat. If it does repost.

Hope your is a simple fix

Fuse 20 has blown. Went to replace it and it blew straight away. Any suggestions.

Did you move either the seat or the steering wheel or did it blow without touching anything?

Blew as soon as blades made contact in the fuse holder. Short under seat I reckon. All because I let swmbo drive and adjust the seat.

Haha, yeh that's how mine started too!

Yeh you have a short on the main power see if there is anything obvious under the seat if not you will have to take the seat trim off, 1x torx scre and some plastic clips, really easy to get off tho.

If I can help let me know

Geordiefella,

Have you tried a hard battery reset sir? Even if you reset everything using the IID, if the ECU is in distress (stuck) no use of any diagnostics will help the situation sir...

Hi Craig

Yeh I disconnected the battery & left it for about 1hr while I was looking inside the seat ecu but it was still the same when I reconnected.

Cheers

But did you follow the correct procedure? Allowing the car to go to sleep first etc etc??? Even then, I’m not sure if 1hr would be long enough sir... Can you try a hard battery reset?

Ive not found any definite stuff regarding the hard reset, i take it you mean short the +ve & -ve leads together after allowing srs to discharge?

I assume the car will have gone to sleep by the time I disconnected as it was probably more than 20mins before i did it, so could that be the issue I should have done it before it was asleep?

Rave states:

Battery Disconnecting
It is imperative that the key is removed from the ignition switch before disconnecting the
battery. A time of 2 minutes must also elapse (after the ignition has been switched off) before
the battery should be disconnected. Failure to do so could result in:
- Navigation computer software damage
- Incorrect fuel gauge reading.
Before disconnecting the battery, disable the alarm system and switch off all electrical
equipment. If the radio is to be serviced, ensure the security code has been deactivated.
CAUTION: Never disconnect the battery with the ignition switched on.
CAUTION: To prevent damage to the navigation computer software, a waiting period
of two minutes must elapse after the ignition is switched off before the battery leads
are disconnected.
CAUTION: To prevent damage to electrical components, always disconnect the
battery when working on the vehicle's electrical system. The earth lead must be
disconnected first and reconnected last.
CAUTION: Always ensure that battery leads are routed correctly and are not close to
any potential chafing points.
After reconnecting the battery, the steering wheel must be turned to full LH and RH lock (with
the engine running). This allows the Dynamic Stability Control (DSC) system to relearn the
steering wheel position. Failure to do so will result in a variety of instrument pack warning
lamps being illuminated.

I would have thought 1 hr more than enough for the electrics to discharge in the ecu's tho

Hi - you don't say what MY your vehicle is. I've got an 07 which had steering wheel adjustment issues. Whizzing the seat out is fairly easy and once removed from the car, you get good access to all the electronics, etc. that are likely to be causing the issue. Incredibly the connector had pulled out for my steering wheel caused by (I suspect) incorrect fitting when the seat was previously removed. If you've got a decent mulitmeter and RAVE circuit diagrams to hand, fault finding isn't too bad. On an 07-09 MY, the common point is the seat control ECU which is mounted alongside the offside runner on the drivers seat. Regards, Chris

Did either of you find the fault?