[imidazol97]

When you get in to the control assembly
there are three connectors one of them is a 10 pin connector
Should be marked A through K.

K J H G F
A B C D E

Pin F to ground is battery voltage through IP fuse block fuse 11
Pin C is battery voltage measured to ground
Pin H to C should be battery voltage between the two

This is the car end of the connector: not the part to the ac control
The key is in run position.

To get to the unit
the lower trim parts pry out gently. The glove box comes out with a bunch of screws. There are then 4 screws inside the louvers for the air condition at the top. The vents gently pull out forward. The screws at the top DO NOT DROP. You will spend a lifetime getting them back out of the heater unit if ever.

This is from a 93 factory service manual