Stripped the central locking module out and warmed it gently in the oven (60 degrees) - installed it again and no hazards. Took it for a spin and they came on after about 2 mins. Hazard switch turned them off. Came on again after 30 seconds, couldn't turn off. Pulled up on the drive and switched engine off. Hazards stayed on. Fiddled with the switches on the dash and discovered that if the hazards are flashing cycling the headlights on and off turns the hazards off. Cycling the headlights again then switches the hazards on again and so on. I think its getting towards diagnostics time unless anyone has any further suggestions :o(

Thanks Peter. I've checked all the other lights, interior and exterior and all seems OK. My Dads gonna take it to the local garage on Tuesday morning and see if they can sort it. A mate of mine with a local garage reckons it might be the alarm siren ECU which apparently are well known for getting damp. I think this is located behind the rear bumper - thats certainly where the siren is but I'm not about to take the back bumper off.

Not the case at all and I don't see the purpose of you coming along and getting a***y - I did as Peter suggested and checked all functions relating to lighting etc and all seemed OK. I'm very appreciative of the advice that was given, its just that potentially now stripping sections of the dash out or taking the back bumper off is taking me away from what I'm entirely comfortable doing.

Appreciate that but I'm genuinely not after free advice without giving something back.

Part of the panic was due to the car being up for sale, in the meantime it's been sold with the fault, the buyer happy to address it himself. He's promised to let me know what the problem was when its identified so I'll post it back on this thread when I've found out. Thanks again for everyones help with this. If I'd had more time maybe I'd have investigated this further but sadly time was of the essence. A happy outcome so far though.

Noticed yesterday that the drivers side carpet was still a little damp after I used an upholstery cleaner to remove a stain. Wonder if theres a module under the carpet there that might have got damp as a result ?

I texted the guy that bought it who drove it home 120 miles. The hazards started on our drive, I switched them off by cycling the headlights and he got all the way home without it happening again.

If I get any more detail I'll post it up

Hi i bought this car in question and i took it to the auto electricians and they diagnosed it as a electrical unit part number 8E0907279D some power control unit up behind the dash, ive got the old unit, and car is perfect now :)

Rob

Thanks Peter spot on with your diagnosis their..

What is BBA rep-man a user name on here or a short cut for somewhere sorry dont know what you mean thats all..

Rob

Spot on mate thanks :)

I have all the same problems as stated above, but with a 2002 Audi A4 Quattro 3.0, does anyone know what part I would need to fix this? My driver side floor got wet due to sunroof leakage and I think maybe something in the floor got damaged, PLEASE HELP ME! :(

Hi gaz,

Sounds like the convenience control unit has got wet or the connections on the passenger side A pillar are corroded by water ingress ?

Take the passenger's plastic sill trim and lower A pillar kick panel off, lift the carpet and check inside the module for dampness and green, corroded connections. Also, check the connection blocks in the rail on the A pillar by disconnecting them and inspecting for corrosion on the pins. It's usually the grey coloured block connector that gets it badly.

If either location show bad connections you may be lucky and a case of drying them and cleaning with a good electrical contact cleaner may fix it ? Don't forget to find and cure the cause of the water ingress though. The usual culprit is blocked drainage holes in the plenum (battery compartment) that fills up and spills over the pollen filter housing and into the cabin.