Key Programming — Unlimited Key Mode

Enable

NOTE: When in the unlimited key mode, the KEYS_PROGMD PID in the BCM always reads 2, regardless of how many keys are programmed to the vehicle (after the first 2 keys have been programmed to the vehicle).

NOTE: If the BCM PID UNL_KEY_ID is not available, unlimited key mode is turned on and must be turned off before viewing the stored code. At this time, unlimited keys may be programmed to the vehicle. To view/disable/change the stored code, follow the procedure below for disabling the unlimited key mode.

1. The customer must choose an 8-digit number (except for 00000000, 00000001, or FFFFFFFF) to be programmed to all of their vehicles or to all of the keys for one vehicle. Valid digits are 0-9 and the letters A-F.

2. From the scan tool, enter TOOLBOX. Select Body>Security>PATS Functions and follow the IDS on-screen instructions to enter PATS security access.

3. Once in security access, select "unlimited key mode ON" and follow the IDS on-screen instructions.

4. Select "program unlimited key code" and follow the IDS on-screen instructions. Enter the 8-digit code chosen by the customer in step 1 of this procedure and follow the IDS on-screen instructions.

5. Select "Ignition Key Code Erase" and follow the IDS on-screen instructions.

6. Turn the key to OFF and disconnect the scan tool (the key does not need to be removed from the ignition at this time).

7. Turn the first PATS key to RUN for a minimum of 3 seconds.

8. Turn the first PATS key to OFF and remove the key from the ignition key cylinder.

9. Insert the second PATS key into the ignition key cylinder and turn the ignition key cylinder to RUN for a minimum of 3 seconds.

10. The engine should now start with either PATS key.

11. If it is desired to program additional key(s), REFER to Key Programming Using Two Programmed Keys .

Disable

1. From the scan tool, enter TOOLBOX. Select Body>Security>PATS Functions and follow the IDS on-screen instructions to enter PATS security access.

2. Select “unlimited key mode OFF” and follow the IDS on-screen instructions.

3. Select “Ignition Key Code Erase” and follow the IDS on-screen instructions.

4. Turn the key to OFF and disconnect the scan tool (the key does not need to be removed at this time).

5. Turn the first PATS key to RUN for a minimum of 3 seconds.

6. Turn the first PATS key to OFF and remove the key from the ignition key cylinder.

7. Insert the second PATS key into the ignition key cylinder and turn the ignition key cylinder to RUN for a minimum of 3 seconds.

8. The engine should now start with either PATS key.

9. If it is desired to program additional key(s) (a total of 8 keys can be programmed into the BCM ), REFER to Key Programming Using Two Programmed Keys .