GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 DeVille 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 Programming Replacement Keys, Ignition Cylinder, or Powertrain Control Module

Tools Required

    • J 35628-A VATS/PASS Interrogator
    • J 35628-90 VATS/PASS Harness Adapter

In order to replace lost PASS-Key® II ignition keys, determine the required mechanical cut and the key code to start the vehicle from the vehicle invoice.

If the codes are not available, use the following steps in order to determine the code:

  1. Determine the mechanical cut from the following sources:
    2. • The code sticker on the steering column (ignition) lock cylinder
    • The original key knock outs
    • If the mechanical cut can not be determined, replace the steering column (ignition) lock cylinder.
  2. Using the J 35628-A and the J 35628-90 determine the correct key code using the following steps:
    3. 2.1. Connect the J 35628-90 (48 way) connectors to both the body harness and the steering column harness of the steering column inline connector C202.

            Important: Do not connect to the ignition lock switch.

    2.2. Connect 1 J 35628-90 (2 way) connector to the harness side of the steering column (ignition) lock cylinder connector.
    2.3. Connect the other end of the J 35628-90 (2 way) connector to the J 35628-A .
    2.4. Turn on the J 35628-A .
    2.5. Place the key code switch in the number 1 position.
    2.6. Start the engine with the new mechanically cut key.

    If the engine starts, the key code is 1.

    2.7. If the engine does not start, turn the ignition switch to the OFF position.
    2.8. Press the 4 minute timer on the J 35628-A .
    2.9. When the timer light turns OFF or the START CAR message is displayed, place the J 35628-A key code switch in the next position (2,3,4, etc.).
    2.10. Attempt to start the engine.

    If the engine starts, you have the correct key code. Proceed to the next step.

    If the engine does not start, perform the previous 3 steps.

    2.11. Make a new ignition key using the correct key code and the mechanical cut.
    2.12. Ensure that the new key starts the engine.

Theft Programming

Important: 

   • If replacing the instrument panel cluster (IPC) with a GM Service Parts Operations (SPO) replacement part, the module will learn the passkey data code immediately. The existing PCM however, must learn the new fuel continue password when the IPC is replaced.
   • If replacing a PCM with a GM Service Parts Operations (SPO) replacement part, after programming, these modules will learn the incoming fuel continue password immediately upon receipt of a password message. Once a password message is received, and a password is learned, a learn procedure must be performed to change this password again. A PCM which has been previously installed in another vehicle will have learned the other vehicle's fuel continue password and will require a learn procedure after programming to learn the current vehicle's password.

Conditions

Use these procedures after replacing:

    • IPC
    • PCM

10 Minute Learn Procedure

Tools Required:

    • Tech 2
    • Techline terminal with current SPS (Service Programming System) software
  1. Connect the Tech 2 to the vehicle.
  2. Select "Request Information" under "Service Programming".
  3. Disconnect the Tech 2 from the vehicle and connect it to a Techline terminal.
  4. On the Techline terminal, select "Theft Module Re-Learn" under "Service Programming".
  5. Disconnect the Tech 2 from the Techline terminal and connect it to the vehicle.
  6. Turn ON the ignition, with the engine OFF.
  7. Select "VTD Re-Learn" under "Service Programming".
  8. Attempt to start the engine, then release the key to ON (vehicle will not start).
  9. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF (the vehicle is now ready to relearn the password on the next ignition switch transition from OFF to CRANK).
  10. Turn OFF the ignition, and wait 5 seconds.
  11. Start the engine (the vehicle has now learned the password).
  12. With the Tech 2 (scan tool), clear any DTCs.

30 Minute Learn Procedure

Tools Required:

None

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON (vehicle will not start).
  3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
  4. Turn OFF the ignition, and wait 5 seconds.
  5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the password on the next ignition switch transition from OFF to CRANK).

    6. Important: The vehicle learns the password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

  6. Start the engine (the vehicle has now learned the password).
  7. With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).