The computer, or "ECM," doesn't control your lights. What you should check first is your fusible links. They look like 14-gauge wires (but they are not) at the positive battery cable; they have a black, plastic connector that plugs into a receptacle on the positive cable end. You can use a 12v test light to back probe the connector furthest from the cable end to see if power is getting through the fusible link wires. If the link is "open," it will cut power to several different fuses in your fuse box and affect multiple, not necessarily related, items. Fusible links can be purchased from the dealer and typically run about $12-15. Usually when they fail, it's because a circuit shorted or the battery was cross-jumped. I had a power wire to a fuel injector get cut by the edge of the cylinder head on my 97 Hardbody KA24E and caused a fusible link to "open." If those are good, check the rest of your fuses, both in the engine compartment and under the dash.
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