The 'Anti Lock' light on my 1993 has just started staying on permanently (it would previously go out after a few seconds). Brakes feel normal, pump runs ok, and accumulator holds pressure too.
BUT, trying to pull fault codes, using a switch connected across the 2-pin diagnostic connector in the loom under the rear seat, next to the ABS ecu, gives nothing; i.e: the 'Anti Lock' light does not flash at all.

Exhaustive searches of the Saab TB's reveals no mention of such a symptom.

Anybody got any ideas?