My Answer:
It appears that
very possibly you have a bad ABS wheel sensor either up front (right or
left side) if you only have Disc Brakes in the front and drum brakes in
the rear, or else a bad ABS sensor in one of the rear wheels with a 4
wheel Disc Brake system.
The damp part was the giveaway, as if it's doing it in dampness then surely it'll do it when wet as well. That is a given!
Esp if it's not doing it in DRY weather.
If it's not a bad (leaky as from moisture getting inside it) ABS wheel
sensor then it could just be chaffed wires coming off from one of the
wheel sensors that's shorting to ground. Esp when it gets wet as from
dew point moisture or from rain. Possibly, but somewhat doubtful.
If you just had the brakes serviced recently, and the problem started
shortly there afterwords then I would definitely suspect the (a) wheel
sensor.
If it's been a problem from DAY ONE, or even under the original
warranty period then it needs to be fixed for FREE under that original
warranty. No bones about it.
What's probably happening is that the sense wire from whichever wheel
sensor is bad is shorting out and causing the ABS FAULT LIGHT to come
on. I seriously doubt that you will get a CHECK ENG code fault, as this
is purely a BRAKE ABS fault.
One thing you might do is pull the main wiring harness connector off of
the ABS unit itself and check it for MOISTURE on the contacts. If any
is found then that is your problem point.
Even if no moisture is spotted get a can of waterproofing spray from
you local automotive parts store and spray out both sides of the ABS
wiring harness connectors.
Since this is purely a MOISTURE related ABS Warning Light issue/problem it has to be one or the other and nothing else.
Sometimes it's best to check for this issue at night with a good bright
LED type light, as then the MOISTURE will show up better then in the
daytime.
If this fixes the problem please post the result.
Frank
Use wd40 to spray wheel sensores-- wd stands for water diplacement
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