the ECU is short for Electronic Control Unit (computer) and is not on the fob. Does the car have a "VIP" sticker on the windows? The directions you are describing are for that type system, but a 99 should have the true factory style remotes and the program method is much more complex-even to describe correctly in one paragraph. The dealer should only charge $40-$50 for this service and it is done. Best to go to the experts here. Good Luck
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