GM Service Manual Online
For 1990-2009 cars only

Duplicating Ignition Keys

Tools Required

J 35628-A PASS/VATS Interrogator

In order to copy an ignition key, determine which PASS-Key II® key code or resistance value is needed. Test the key that you will copy in order to determine the code. Use the following steps in order to determine the code:

  1. Insert the customer's spare ignition key into the key code reader on theJ 35628-A .
  2. Press the On-Off rocker switch to the ON position.
  3. A number from 1 to 15 will appear in the window designating the electrical code of the key.
  4. Cut a new key.
  5. Ensure that the key has the electrical code that was determined by the J 35628-A .

  6. Start the engine with the new key in order to ensure the key is mechanically and electrically correct.