Bosch built in dishwasher -spray arm on top basket wont rotate as no water coming from outlet on spray pump.but the outlet for lower basket is fine.when i plugged the bottom hole the water then shot up to top basket.now it will only rotate bottom basket when loaded.

Check the water supply line for kinks, check bottom strainer/drain inside to remove particles/trash blocking water from exiting to pump washer motor, be sure no items block rotation of washer heads. Good luck.

Check your salt container is full and the cap is on securely. Check the rinse aid is full. Check that the holes in the top spray arm are not blocked with food, plastic etc. or if you have a deodoriser hanging on the top basket that it is not obstructing the rotation of the spray arm.
This model has a diversion motor that alternates the water flow between the top and bottom arms, there is the possibility that this is faulty and the water flow is locked and only feeding the bottom spray arm. (This unfortunately will require a professional to replaced the instantaneous water heater). If you put the machine on a prerince cycle you should be able to hear the switch between the two baskets (approx every minute) to verify this, if you completely remove the top basket the change in the noise will be more obvious.
Hopefully, the first part of info will solve your problem.
Hope this helps, please leave feedback or add comment if this helps or you require further assistance.

Check top basket is straight and moves back fully, remove top spray arm and check holes are not blocked. The water pressure from the top arm is deminished if they are blocked and once the dispenser door opens it is the top spray arm water that propels the tab into the tank. Also, check that when your tallest item is in the bottom basket it does not obstruct the rotation of the top one.
Hope this helps to give you a starting point to remedy fault.

If the water is noticed at the bottom of door it is probably the seal at the bottom (very unusual for the tank seal to leak, however it is just pushed in, so you could take it completely off, give it a clean up and put it back in) or one of the spray arms is restricted and instead of rotating the water is spraying continually at the corner of the door. Check all hole in the spray arms are clear and if you have a dishwasher freshener make sure it is not stopping the top spray arms rotation field. You could also check that the top arm is clear to move when your dinner plates are in the bottom basket (the top basket could have been moved inadvertently to the lower level).
Hope this gives you a starting point for checks.
ps bottom door seal is quite tricky to replace, so you may need to get an expert is the above tests indicate that that is the leak source.

Carefully inspect the lower spray arm for a crack or separation.
Also inspect the holes in the spray arm that may be stopped up with debris.
Remove and clean the filter in the front center of the tub.
Set the spray arm at the 12 o'clock position and start the washer. After 30 seconds open the door and check the position of the spray arm. Do thi several times to confirm the spray arm is rotating.

your top spray arm is blocked and not rotating,remove it from top basket and thoroughly clean it paying particular attention to the holes right at the ends these are angled to drive the arms round if they block up the arms will not rotate.

usually it will clip to the basket that holds cups and the like, and engages with the water outlet when the basket is slid into position. Some spray arms have a locking ring that, when the spray bar is held in place, rotates clockwise (if viewed from underneath) and locks the spraybar in place.

Our Bosch has a round knob in the center of the arm, under the basket. ROtate it 90 degrees, and the arm drops away and can be cleaned.

you have a failed circulation pump

Penrod, sounds like a circulation problem. Two things to check first. make sure the upper spray arm is not clogged with debris or split. Second is to twist and remove the filter and clear out any debris where the water enters the circulation pump impeller. If something has jammed the impeller, you would have to remove the dishwasher, remove the tank, remove the circulation motor and clean out the impeller...Catriver...post back.