Does anybody know how to repair a water leak from the sun roof in a 2003 S430 ? I think it a leak from the sun roof and the water leak drip onto back seat via the light fixture.

 

Likely the drain tubes from the sun roof assembly have become blocked / trapped.
Ever had any rear end damage? If so likely that when the rear bumper was refitted the tubes got trapped.

In fact there are 4 tubes leading down each pillar and out to the road.

Not easy to access without taking the roof out but try blowing air up from the outlet end of the tubes or a suitable wire / "fish" (If you understand that term in USA)

If you remove the boot linings you should see the drain tube in the area above the rear wheel arch.

Stuart

 

i had no idea ur rear bumper were connected to the drain tubes...interesting.

 

There not connected in the physical sense. However the bumper passes in the vicinity of the exiting tubes and it is possible that they are trapoped. Alternatively they can be blocked with pine needles etc which can collect when the roof is open and then get washed down the tubes and cause an obstruction..

Stuart