Hi, I have an 02 estate.
I recently changed the Dav2000 comm unit as my indicators were extremely sloppy.
Since then I had a light come on saying airbag fault. Also my horn stuck on and then stopped working.
I think the last was because an earth wire got trapped in one of the contact springs. I've checked all the fuses and all seem ok, inside the car and the engine compartment. The airbag light I read there is a sensor or connection block under both seats. Can someone tell me which ones and how to bypass please as there are several with the same coloured wires.
Thank you
Buck
Lastly (prob same fuse) but the computer display is very dim now too?
Id really appreciate any help as my mot due soon.
Horn and airbag fault
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GingerMagic
- 3.0 24v
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- Joined: Fri Apr 06, 2012 9:02 pm
- Location: Bournemouth
Re: Horn and airbag fault
Did you keep the old comms unit? Sloppy indicators is easier to fix than an airbag fault.
2003 2.2hdi estate - mine
1998 Volvo 940 auto estate - also mine
2019 Citroen C3 something - the wife's
PP2000 user, can help with faults / diagnostics in the Bournemouth area.
1998 Volvo 940 auto estate - also mine
2019 Citroen C3 something - the wife's
PP2000 user, can help with faults / diagnostics in the Bournemouth area.
Re: Horn and airbag fault
Hi, yes I kept the old indicators and bought repair bushes and fitted them(the little metal prongs that slide got bent, I straightened them but have no way of knowing if there making contact)
. However I haven't tested the unit as the other one was on the car and at the time working fine.
Do you think it's likely to be the comm unit? I really hope not though this airbag light is a real worry as it's an mot fail.
Although I've checked all the fuses does anyone know where and which is the horn one?
Thanks.
. However I haven't tested the unit as the other one was on the car and at the time working fine.
Do you think it's likely to be the comm unit? I really hope not though this airbag light is a real worry as it's an mot fail.
Although I've checked all the fuses does anyone know where and which is the horn one?
Thanks.
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GingerMagic
- 3.0 24v
- Posts: 3579
- Joined: Fri Apr 06, 2012 9:02 pm
- Location: Bournemouth
Re: Horn and airbag fault
Possibly, I assumed the airbag fault started when you fitted the new comms unit....
I would firstly unplug the connectors, one at a time, that are under the front passenger seat ( 5 I think ) but only when you have had the ignition off for at least 5 mins as the ECU is still awake for a while when you take the key out.
If this doesn't work then look for a member near you with PP2000 and this will pinpoint the airbag that is causing the fault - please add your location and someone on the forum may be able to help.
The horn fuse on my car is in the engine bay compartment, the fusebox with a grooved lid near the air filter box. It is a blue 15amp and it is on the right of the box, second fuse up from the bottom when standing by the front grill. Mine is a 2.2Hdi which may have a different layout to a 2.0Hdi....
I would firstly unplug the connectors, one at a time, that are under the front passenger seat ( 5 I think ) but only when you have had the ignition off for at least 5 mins as the ECU is still awake for a while when you take the key out.
If this doesn't work then look for a member near you with PP2000 and this will pinpoint the airbag that is causing the fault - please add your location and someone on the forum may be able to help.
The horn fuse on my car is in the engine bay compartment, the fusebox with a grooved lid near the air filter box. It is a blue 15amp and it is on the right of the box, second fuse up from the bottom when standing by the front grill. Mine is a 2.2Hdi which may have a different layout to a 2.0Hdi....
2003 2.2hdi estate - mine
1998 Volvo 940 auto estate - also mine
2019 Citroen C3 something - the wife's
PP2000 user, can help with faults / diagnostics in the Bournemouth area.
1998 Volvo 940 auto estate - also mine
2019 Citroen C3 something - the wife's
PP2000 user, can help with faults / diagnostics in the Bournemouth area.
Re: Horn and airbag fault
Hi, thank you for your reply it's really helpful. If the connectors are left unplugged won't that cause it to display a fault?
The horn stuck on one day as I was leaving work just a few days after fitting the new comm unit . I quickly jiggled the pad and it went off. I reseated the airbag/horn pad and the horn didn't work, I presumed a fuse had gone and that it was my negligence fitting it when ibid the comm.
Then a week or two later while on a run the airbag warning light came on. Initially I thought it was the horn/airbag pad again but could see no problems.
Then the screen that displays car info and the airbag warning went very dim and has stayed like that. I thought perhaps it worked on the same circuit as the horn or that another fuse had popped.
Tonight I went out and checked fuses, disconnected the battery and removed the airbag/horn pad again and found a red earth wire had become trapped it one of the springs. The wire was flattened but looked ok. I'll replace it tomorrow.
The comm units are so expensive I'm hoping it's not that again!
Once again thank you.
The horn stuck on one day as I was leaving work just a few days after fitting the new comm unit . I quickly jiggled the pad and it went off. I reseated the airbag/horn pad and the horn didn't work, I presumed a fuse had gone and that it was my negligence fitting it when ibid the comm.
Then a week or two later while on a run the airbag warning light came on. Initially I thought it was the horn/airbag pad again but could see no problems.
Then the screen that displays car info and the airbag warning went very dim and has stayed like that. I thought perhaps it worked on the same circuit as the horn or that another fuse had popped.
Tonight I went out and checked fuses, disconnected the battery and removed the airbag/horn pad again and found a red earth wire had become trapped it one of the springs. The wire was flattened but looked ok. I'll replace it tomorrow.
The comm units are so expensive I'm hoping it's not that again!
Once again thank you.
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GingerMagic
- 3.0 24v
- Posts: 3579
- Joined: Fri Apr 06, 2012 9:02 pm
- Location: Bournemouth
Re: Horn and airbag fault
Silly me, I meant unplug, then replug the connectors one at a time.... 
Maybe do this several times ( plug/unplug/plug/unplug ) to get a good connection.
Check the horn fuse next, I'm not sure the MFD diming is related to anything else...
Maybe do this several times ( plug/unplug/plug/unplug ) to get a good connection.Check the horn fuse next, I'm not sure the MFD diming is related to anything else...
2003 2.2hdi estate - mine
1998 Volvo 940 auto estate - also mine
2019 Citroen C3 something - the wife's
PP2000 user, can help with faults / diagnostics in the Bournemouth area.
1998 Volvo 940 auto estate - also mine
2019 Citroen C3 something - the wife's
PP2000 user, can help with faults / diagnostics in the Bournemouth area.
Re: Horn and airbag fault
I'm just about to change the red wire that was trapped. I think it's the earth for the horn and possibly the airbag to. It would explain both faults and why I can't find a blown fuse.
If that doesn't work I've established it's the orange wire under the seats.
They go into connection blocks, I believe the blue block is for the side airbags if fitted and the brown block is for the airbag. (pretension)
I did it wrong and did the blue block yesterday which obviously was no help.
As I said I'll try the earth wire again and hopefully that's it, if not I'll do the brown connection block.
Note the wires going into one side of the plug are both orange, on the other side there's a blue and a brown so it's best to join 1 side at a time.
I struggled getting this information. So I hope it's of use to someone.
buck.
If that doesn't work I've established it's the orange wire under the seats.
They go into connection blocks, I believe the blue block is for the side airbags if fitted and the brown block is for the airbag. (pretension)
I did it wrong and did the blue block yesterday which obviously was no help.
As I said I'll try the earth wire again and hopefully that's it, if not I'll do the brown connection block.
Note the wires going into one side of the plug are both orange, on the other side there's a blue and a brown so it's best to join 1 side at a time.
I struggled getting this information. So I hope it's of use to someone.
buck.
Re: Horn and airbag fault
Just to update:
After trying to remove the airbag from the steering wheel it jammed on one side, sadly this meant that the little extra pressure required caused me to pull the ribbon from the plug on the side of the pad. I had to start soldering.
Meanwhile I tried my old comm unit but that's had it.
So I still have no horn, and no an airbag fault and NO blown fuses.
A friend has a snap on diagnostic kit and has offered so hopefully that'll help.
You'd think it was so easy lol.
After trying to remove the airbag from the steering wheel it jammed on one side, sadly this meant that the little extra pressure required caused me to pull the ribbon from the plug on the side of the pad. I had to start soldering.
Meanwhile I tried my old comm unit but that's had it.
So I still have no horn, and no an airbag fault and NO blown fuses.
A friend has a snap on diagnostic kit and has offered so hopefully that'll help.
You'd think it was so easy lol.
Re: Horn and airbag fault *Resolved*
Hi all, last post on this as the problems been resolved.
With the help of a good friend we established no power was coming from the comm unit to the horn, and on his diagnostic machine it showed fault 1 igniter problem and fault 2 igniter 2. Basically nothing was travelling along the 3 wires from the comm unit that pass through the steering wheel. Inside the comm unit these wires become part of a very long ribbon prob 6ft long that's coiled up. That had failed, luckily I had another unit and we were able to swap bits over.
I say we but it was mostly my friend that deserves the credit as he were at it for 3 hours after long days at work.
Mine wasn't a run of the mill fault, I don't know what caused it but a lot was learnt.
Thanks for your advice,
Regards buck
With the help of a good friend we established no power was coming from the comm unit to the horn, and on his diagnostic machine it showed fault 1 igniter problem and fault 2 igniter 2. Basically nothing was travelling along the 3 wires from the comm unit that pass through the steering wheel. Inside the comm unit these wires become part of a very long ribbon prob 6ft long that's coiled up. That had failed, luckily I had another unit and we were able to swap bits over.
I say we but it was mostly my friend that deserves the credit as he were at it for 3 hours after long days at work.
Mine wasn't a run of the mill fault, I don't know what caused it but a lot was learnt.
Thanks for your advice,
Regards buck
Re: Horn and airbag fault
You have probably damaged one of the cables while undoing the steering wheel release spring. I have done something similar, I made a tool to release the airbag and it slipped and went through both cables to the igniters :-( I have tried soldering but it seems if there is a difference in resistance between cables you will get an airbag fault, so for now I have stuck resistors on the connectors and no longer got a fault, but of course do not have a drivers airbag now! I am going to try to repair the cables again when I have a minute to spare but it might be as well to pull another unit apart and swap the reel over. BTW The airbags are in no way connected to the circuit within the comm unit.
Re: Horn and airbag fault
If it's any help I can post pics of the inside, and if there are any parts you need let me know.
Coming from the comm unit or more specifically the boss, there are 3 wires, the live for the horn and the two airbag ignitors.
As I said above I broke one and tried soldering it but it didn't work and since broke off anyway.
Anything you need from the comm unit your welcome to.
Kind regards buck
Coming from the comm unit or more specifically the boss, there are 3 wires, the live for the horn and the two airbag ignitors.
As I said above I broke one and tried soldering it but it didn't work and since broke off anyway.
Anything you need from the comm unit your welcome to.
Kind regards buck
Re: Horn and airbag fault
Just to add to this, I caused a very similar fault after fixing the indicator being sloppy.
The circular part that i was told not to move and tape it still i didnt do properly, and it spun and i didnt realise when putting it all back together. After testing the wheel alignment when id put it all back together and putting the steering on full lock either direction, the horn stoped working and the airbag showed a fault.
The long ribbon cable inside the dav2000 unit had become wound tight inside so the extra turn of the wheel cause it to rip the ribbon cable off its terminating connectors. I should have made sure it was not wound tight and a little loose. The ribbon end has some flat copper strip comming out of it and im going to attemp to solder it back onto the coresponding flat bits of copper on the plastic, hopefully it works !
The circular part that i was told not to move and tape it still i didnt do properly, and it spun and i didnt realise when putting it all back together. After testing the wheel alignment when id put it all back together and putting the steering on full lock either direction, the horn stoped working and the airbag showed a fault.
The long ribbon cable inside the dav2000 unit had become wound tight inside so the extra turn of the wheel cause it to rip the ribbon cable off its terminating connectors. I should have made sure it was not wound tight and a little loose. The ribbon end has some flat copper strip comming out of it and im going to attemp to solder it back onto the coresponding flat bits of copper on the plastic, hopefully it works !