Connection diagram 2002 aurora sunroof drain - 2002 Cadillac Sts

It is always blocked sunroof drains. Videos in the link

https://www.google.com/search?q=2002+Toyota+Celica+GT%2C+sunroof+drains

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What do you mean "discharge line"? Do you mean for the fuel circuit, AC, vent drains, sunroof, heater, transmission, etc.?

find the main ecu under the hood pull connection apart check for corrosion-clean any out -you can get a pin cleaning kit at autozone or advanced auto-plug back together -sometimes just pulling apart and re plugging can help with connectivity-Denny

Remove the sun visors & what ever else you need, to drop the head liner

Then you can access the drain tubes,if they came off

To blow out, you just open the roof you will see the holes in the corners

water leaks from your sunroof are most likely due to plugged or blocked drain tubes. make sure water with flow out of all 4 drains,2 in front and 2 in rear.pine needles and leafs will pull them and cause water to flood over the guttersand into vehicle.

Id start by just checking the fuse and relay for the sunroof to make sure they are good. Im not exacly sure, but I think the sunroof fuse and relay are in the fuse box located under your back seat. Your owners manual has a diagram of both the fuse boxes in that car (under the hood to). Id start here. If the fuses and relay is good, I would take it to a dealer, it may be the motor. If you can hear the motor whining but it is just not moving, something may be jammed in the track, Good luck

yes go to any gm dealer parts dept.and ask for a print out they will be glad to help

There is a Relay in the Box under the Hood for the Same thing. Change this Relay and they Should Work. Is the fuse good? Hope this Helps

There are 4 holes on sun roof to drain water from up. You have to check & Clean those lines....