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Discussion Starter · #1 ·
Mornin'

My ZT 135 is having some elctrical issues at the moment, I'll list the number of exact problems in a sec, I have been told by an autoelectrician that the issue is with a 'Body Control Module Unit' which needs to be replaced or reprogrammed by a MG specialist. I recently took it to the nearest specialist who told me there seems to be 2 control units which are faulty and they cannot be reprogrammed only replaced at a cost of £350 approx., as the car is under warranty I said go ahead but the warranty co. have said they'll only stump up the money if it fixes the issues, the specialists say it may or may not fix the problems, they're about 90% sure it will, here are the issues;

No dash lights, except trip computer, i.e. indicators, main beam.
Central locking only opens the car via the remote, doesn't lock, locking has to be done manually from within the car (please don't steal my car).
Airbag fault displayed on trip computer screen after approx. 10mins journey time.
Air con/heating displays 'Er' on both sides when turned on.

If anyone has had identical/similar issues and knows which part needs replacing please post, or if anyone has any insight. Personally even if the units are changed out and the problem is not fixed I don't see why I should be paying if the car is under a valid warranty...any thoughts?
 

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mg_zt_260
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Well if the specialist says there's two units which are faulty, then they should be replaced under warranty regardless if whether it fixes the problem or not, shouldn't they?

If you took the car in for this problem, and they found a fault which meant the wheels were about to all fall off, would they not have to fix that under warranty, despite the fact it's not the reason you took the car in to start with?

Sorry, warranty companies annoy me.

From my limited experiance of car electronics, it does sound like a control unit fault, but i wouldn't have a clue as to which units there even are.

Sorry, not much help, but i hope it all gets sorted.
 

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Mornin'

My ZT 135 is having some elctrical issues at the moment, I'll list the number of exact problems in a sec, I have been told by an autoelectrician that the issue is with a 'Body Control Module Unit' which needs to be replaced or reprogrammed by a MG specialist. I recently took it to the nearest specialist who told me there seems to be 2 control units which are faulty and they cannot be reprogrammed only replaced at a cost of £350 approx., as the car is under warranty I said go ahead but the warranty co. have said they'll only stump up the money if it fixes the issues, the specialists say it may or may not fix the problems, they're about 90% sure it will, here are the issues;

No dash lights, except trip computer, i.e. indicators, main beam.
Central locking only opens the car via the remote, doesn't lock, locking has to be done manually from within the car (please don't steal my car).
Airbag fault displayed on trip computer screen after approx. 10mins journey time.
Air con/heating displays 'Er' on both sides when turned on.

If anyone has had identical/similar issues and knows which part needs replacing please post, or if anyone has any insight. Personally even if the units are changed out and the problem is not fixed I don't see why I should be paying if the car is under a valid warranty...any thoughts?

Morning to you too.
Has anyone tried disconnecting the battery for about 20 mins to reboot the systems?

Nick
 

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Discussion Starter · #4 ·
Battery

Cheers for the replies,

The specialists have told me that they have rebooted the ECU thru the computer which diagnosed the 2 faulty units, so yes i believe that has been tried.

The arguement the warranty co. put up was that if i took it to a specialist with say a gearbox issue, the specialist could, for example, fit a new exhaust on the car and turn round and say "well that didn't fix the gearbox but its under warranty so the warranty company can pay for the new exhaust". Its a rather obscure example but i can see their point but then my arguement back at that them each time is, if i'm paying ££'s to them each month but i still have to pay for new parts then why the hell do they exist in the first place.
 

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mgb
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A lot of electrical hiccups can be resolved by disconnecting te battery for a while, re-booting the ECU may not re-boot the other control units.

The specialists have identified 2 faulty control units, have they told you which ones? The symptoms are that of a faulty K-Bus connection (computer data link cable) which is connected to the various control units.

The airbag has its own ECU, the aircon has its own ECU (a K-Bus fault will show up as 'err' in the panel window) the central locking is connected to the BCU. The common factor is the K-Bus, it could be faulty, not the control unit it is connected to.
 

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Discussion Starter · #6 ·
hello again

After waiting weeks for the specialists to receive the 2 new control units, they fitted them and no change, still no remote central locking, still has an airbag fault, still no indicator dash light & sound, basically it made no difference.

The specialist then said that this all points to the instruments pack, a new one is on order and can be fitted when it arrives.

I'm gonna ask about the connector but I just wanted to be sure i'm not being taken for a ride and that the specialists are just fitting new parts for anything to do with the electrics, I mean they've already missed once. So anybody know that fitting a new instruments pack is gonna have any affect on the problems the car is experiencing?
 

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Electrical Fault MG ZT-T cdti

Same thing happened to me this morning, opened the car started up and a way I went. Put the indicator on to turn left - no flashing light on the dash, no radio and "er" on both sides of the air conditioning. Checked all the fuses so gave up, car would not lock.
Somebody mentioned a connector that could be faulty, could anyone tell me where it is and what it looks like?

thanks
 

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I am experiencing the same problem, any chance you could tell me where the K-bus connector is and what it looks like - do they come loose?

Peter

Thanks to Keith, I checked the connectors in the boot (TV Tuner/Radio Tuner) water, lots of green corrosion, disconnected battery, cleaned them up, WD40, dried evrything out, re-connected battery and everything back to normal. Keep checking for water and nothing seems to be coming back.
 

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mgb
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The K-Bus is a data cable that is connected to various electrical components, Have you got a fuel burning heater? that is one thing that is connected to the K-Bus and has been known to cause problems. If you have, unplug the connector nearest the front of the car and see if that clears it.
 

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You lot have missed the obvious water!

These problems can be a bit of pain to sort out but my hourly rates are reasonable ;)

I trust you have verified the plenum and spare wheel well in the boot is clear of water?

If so next thing you can do if you have one fitted is to eliminate the Webasto FBH as Ray said above

Unplug the power plug with two wires in it then unplug the 6 pin plug then see if things are working.

As for two ecus being faulty at the same time leading to this one fault I doubt it without there being a cause, was it diagnosed on Testbook as some of these third party system are hopeless?
 

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Can't these symptoms also be an indication that the battery is on the way out? Should be relatively easy to put in a known good one and see if it sorts it.
 

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Can't these symptoms also be an indication that the battery is on the way out? Should be relatively easy to put in a known good one and see if it sorts it.
Nope not when as severe as described what he has imho is a classic case of K bus errors probably due to water penetration grounding the data signal or a connection fault at one of the K bus headers

My money is on a swimming pool in the boot!
 
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