There is a diode under the drivers side dash that fails and causes this. The seats should work with the door closed. A common failure for sure.

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Charlie

85 2.3-16 ECE Track Car "Connie"
86 2.3-16 Slushbox Devils Stepchild. "Red"
89 2.5-16 ECE. Bimmer Eater "Sophie"
02 ML 55 Towmeister "Gertie"