Here is the pic of the location for the head lamp control module. It controls both the popup mechanism.
Trace the wires from the control module and you should see the fusible links behind the battery.
You will need to do some testing to verify if the fusible links has blown. Once blown you will need to replace these. If they are OK I would start looking to test the headlight control module. They can go faulty. My 1990 has never had a failure except for the dreaded slipping bushes of the mechanism itself.
Here is a link for more information.
Hope this helps.