Like others have already stated, the CEL light is usually turned on through the ECU which probably makes a ground connection inside the unit to turn on the lamp. You can check to see if there is voltage on the lamp lead going to the ECU. If there is about 12 volts on it you should be able to ground that point and turn on the lamp to verify the rest of the circuit is ok. If the ECU is causing the trouble you can purchase a rebuilt unit for a lot less money than a new one from the dealer. This is a fairly common trouble. I have fixed some in the past by replacing the lamp driver IC inside the ECU.
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