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I have had a recurring problem with the ABS light coming on while driving. The ABS has been checked, the monitoring system has been checked and all is OK. The latest suggestion from my VW dealer is a new ABS control box - £500.00 plus labour! Any cheaper suggestions greatly appreciated. ( I can't ignore this light, in the Corrado it's fairly prominent. )
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Ask them if this is going to fix the problem. If they say it will, and it doesn't, then don't pay them. You are paying for their expertise, not their ability to guess and bolt on parts.
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A comon cause of this is a faulty sensor or a faulty connection on the cable to the wheels .My Citroen XM did the same ,they wanted to change the control unit at a mega price so I took each sensor off cleaned the connections and tested the cable with a AVO and found a cable had a broken core under the insulation .Total Cost zero + time
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Doug, I can endorse Andy's suggestion, and it is often the cause. If you put a multimeter (If you are lucky enough to have an AVO, use that by all means) on AC volts 0-12v scale, with it connected to each sensor cable in turn, get someone to hand spin each wheel in turn as fast as they can. You are unlikely to get much more than 0.5v, but they should all be about even. If one is different, then there is the problem. We use an oscilloscope for this, because we have one. Secondly, are all of your tyres at about the same level of wear? If one is well worn or new, it will rotate at a different speed to the others and can make the ecu think there is a problem; rare but worth a try. Thirdly, I'm not certain on VW's, but the brakelight switch often activates the ABS pump when you press the pedal, and if it is out of adjustment, can cause faults too. Disconnecting the bulb will ensure an MOT failure, and also mask a potentially dangerous fault, I wouldn't recommend that.
regards
Mike
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If only it was that simple and, unfortunately, electronics problems on Corrados aren't. Check the FAQ answer which gives a list people who can test ECUs.
HJ
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remove the ABS warning light bulb.
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If you remove the ABS warning light the car will fail its MOT. The light must come on, then go out as it's supposed to. There could be scope for some unscupulous scumbag to come up with a bit of circuitry that does this and fools the MOT tester (probably exists already), but anyone who uses this could really be putting lives at risk so not a good idea.
HJ
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Spinning the wheels individually with the car off the ground is likely to cause the ABS light to go on anyway, requiring a VAG diagnostic reset.
The sensors and voltages are the way to go. Use a digital scope meter ( about £2000!) Then & only then, test the ECU, but 99% likely sensor/wiring fault.
The mot tester has a list/chart of ABS light behaviour for all makes so fitted. If it doesn't do as the chart says - fail.
This is one for an ABS specialist.
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Bet its a wheel sensor,they get all the abuse and neglect.
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