After removing the plastic covers around the seats - it will look like this. The seat back lock mechanism is hiding inside under the seat back.
You have to remove the lower 3 hog rings to get access to the two mounting screws.
The new mechanism I got from AVP on the left and the old original one which does no longer work
After installing the new part all you need to do is to install the hog rings again and install the seat cover surround moldings. Here I´m using a hog ring plier - but you can use some simple other pliers as well.
This is how the disassembled original power antenna looked like when taken apart - you can clearly see that the motor was burnt.
This is how the disassembled original power antenna looked like when taken apart - you can clearly see that the motor was burnt. Also the mechanism itself was damaged.
The 74 has a working power antenna again.
You have to remove the seat back material to be able to access the solenoid and latch mechanism
The latch mechanism
The solenoid disassembled - before cleaning - there are two coils inside.
A quick drawing of how the system works.
The upper switch is controlling the seat back solenoid. (Picture was taken before cleaning the door jambs...)
The removed door jamb switch. When the door is closed no contact is made and the solenoids are not energized causing the seat back to be locked in position.
You can see that the switch was slightly bent - making no good contact.
When the door is open contact should be made and the solenoid should energize... The switch did no longer make a good contact though.
I had to remove the lower dash to access the cables on the rear of the door jamb switch through a tiny hole and disconnect the connector with a long nose plier...
I´m now in the long process of thoroughly cleaning the engine bay to look like new again...