94 and I thought 93 use Teves MarkIV unit(I think specifically MarkIV(g)). Should control front left individually, front right individually, and both rear together.
Will be located here:
looks like:
If you choose to try address your abs and get it working. Read the codes. If it is a valve issue, worth it to open up as likely it is just shorting rust on the solenoids:
View attachment 327642
Doesn't mean you don't clean the valves and put new orings on though!
If an issue exists with your ABS, your brakes will still work fine (barring any separate issue), but won't pulse to prevent lockup.
As for the brake warning, check the actual harness connector going to the master cylinder too.