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Determining BCM Programmed Key Code

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: To determine unknown BCM key code, use Interrogator (J-35628-A) and Adapter (J 25628-A) and the following procedure.
  1. Remove knee bolster under steering column. Connect Adapter (J-35628-A) wiring to Yellow 3-pin PASS-Key(R) dash connector at base of steering column. DO NOT connect to steering column wiring.
  2. Turn on Interrogator and move key code switch to "1" position and attempt to start engine using blank key. If engine starts, key code is "1". If engine does not start, turn ignition off and press 4-minute timer on Interrogator.
  3. When timer indicator light goes out, move key code switch to next number and attempt to start engine. If engine does not start, continue trying different key codes until proper key code is determined.
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