Join Date: Sep 2011
Location: Lima, OH
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the IPDM is the Intelligent Power Distribution Module. its the large "fuse block" on the passenger side of the underhood compartment. it has a square cover panel on it as well. dont go messing with this right now because i dont believe its your problem.
what youre decribing is a memory function of the wiper module. if i recall correctly, this should be a part of the stalk. it is very simple to replace these switches as well. you simply remove the shroud pieces covering the upper end of the steering column, screws should be on the bottom side obviously. i believe there is 3 or 4 of the screws holding the two pieces together. once the screws are out, you can unsnap the pieces and use some common sense not to muscle them apart or break them. they'll snap back together when youre done.
once the shroud is off, you should be able to see a white plastic clip at the top and bottom side of the wiper switch block, press both of these tabs down/in simultaneously and the whole switch should just slide towards the passenger side of the vehicle and out. slide in a new one, and youre good to go. make sure the new one fully clicks.
if memory serves me right, the memory and brain of the module is integrated to that switch in the large bulky section of its base. this is what tells the wipers to pulse after youve selected a certain speed. it sounds to me that the brain is dead and only recognizes the first change in speed between each pulse mode.
as far as a replace and pray method of testing..i would probably go for the switch first in this particular instance, because its the cheaper component of the two, between the switch and the motor with integrated module.