Hi there,

The relay I’m talking about is not a square metal box or anything you can open up.
It is flat and is mounted to the inner fender with two screws on top of an aluminum base.
It maybe a dark gray to black looking.
The component itself is held to the base with two other screws.
The paste goes on between the base and the electronic component.

The part is not between the coil and the battery but hidden behind the battery.
You almost have to take the battery out to even see. It’s dark back down in there.

In fact, I just went to look and familiarize myself again
It’s forward of the battery and more in line with the rear of the left headlight but on the fender.
Sort of off the front corner of the battery on the 1991.

What you are saying yours is mounted on the strut tower.
There is a headlight dipping relay and a fan relay for the air conditioning.
If you have a EGR there is a grey vacuum valve that operates the EGR.
It has a filter under a cap that can get clogged and cause the CEL to come on. Just a past experience.

I have three 1990’s cars so it’s been sometime since I have made a visit to bother them!
That part of the problem with these. Out of sight, out of mind!

Hope this helps with my confusion anyways!

Phil