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Your Car should have only one pump for boosting purposes which is in front of the spare tire. The pump you see on the abs module is only activated when the abs is kicked in during wheel slip. If the pump in front of the spare tire is running too long you should normally have a warning light on your dash until the pump stops running. i believe the warning light is the one that shows the all-wheel- drive system. There is also a warning beeper when the pressure on the hydraulic system is too low.
If the pump doesn't stop running at all, i'd suspect either a good sized pressure leak or a bad pressure switch. The pressure switch is on the pump and has a rather large square plug with 5 pins. the pressure switch is usually anodized green.
the other possibility is a bad pressure accumulator if the pump seems to run for a long time every time you start the car but eventually stops running. If you pump the brake pedal a couple of times and you get the warning beep, this is also a sign of a bad accumulator. The accumulator should hold enough pressure to allow you to push the brake pedal 20-25 times before it is discharged with the ignition switch off. You can feel when the accumulator is discharged because the brake pedal becomes really hard.
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