Puzzled me ...
Wednesday last week (cold snap here in London), started up (Nissan 200SX) and drove around a bit (5 miles) and the ABS dashboard warning light came on. Parked up at home and noted that whirring was coming from the engine compartment - looked like part of the ABS circuitry with pipes / wires running off to the four wheels (R, L, RR, RL).
Whirring continued once ignition switched off and kept going until battery flattened ! Recharged the battery overnight and next morning (warmer weather) the cars started fine and ABS happily back to normal.
Any ideas what might have happened? I'm going to guess temperature - but it seems a pretty feeble explanation ... Cheers
Martin (sandylane.d.c.u)
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