You have a problem with vats. shbox.com has a good write up on vats and how to do a resister trick to make up for worn key pellet or bad ignition lock contacts. This resistor trick works about 95% of the time to turn security light off and let car crank and run.
When your security light is on, starter is disabled, as well as, fuel injectors. For the 5% of cars that don't respond to the resistor trick, we have the vats fuel enable signal bypass module. This module sends the pcm the 30 hertz signal your 93 needs to enable the fuel injectors. Please note that your 93 will take the 30 hertz bypass module, while 94 and newer cars use a 50 hertz bypass module.
if you order this module, use the drop down as you need the 30 hertz model, not the standard one.
However, once you wire the bypass module in, you will still need to make the starter function. Again go to shoebox's site, choose the starting and charging wiring diagram.
You are going to have to locate the tdr (theft deterrent relay) it's a starter relay tucked way up under the dash. I believe it's near the passenger airbag bracket. It will have 2 large yellow wires, 1 large dark green wire, and one small yellow/black wire.
The yellow/black small wire is your target. You will need to cut the wire several inches from where it goes into relay. You then splice in another piece of wire, splice it into the piece of wire going to the relay. The other end of the wire you splice in goes to a good ground. Look for a ground located under the dash.
Once you splice and ground the small yellow/black wire, your starter will work anytime you need it, unless there are problems elsewhere.
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