Programming Theft Deterrent System Components Scan 100
Reprogram the identification (ID) code in the following situations:
| • | An immobilizer control unit has been replaced. |
| • | An electronic control module (ECM) has been replaced. |
If a valid key has been lost, refer to Programming Additional Keys .
Transponder
Each valid ignition key has an internal transponder which is a read/write transponder.
The transponder contains an implementation of a crypto-algorithm with 96 bits of user configurable secret-key contained in electrically erasable programmable read-only memory (EEPROM). This data is transmitted to the immobilizer control unit (ICU) by modulating the amplitude of the electromagnetic field; it also receives the data and commands in a similar way.
Programming Theft Deterrent System Components Tech 2
Important: Turn ON the ignition before installing in the scan tool. Failure to connect in this procedure may cause communication errors and the programming procedure will not complete. Any keys that are not programmed at this time will no longer function.
Important: Try to obtain all the keys. At least 2 keys are necessary to successfully program the immobilizer system.
A maximum of 5 keys may be programmed.
Conditions
Use these procedures after replacing:
| • | Theft deterrent control module (Immobilizer) |
| • | Engine control module (ECM) |
| • | Any key |
Immobilizer Programming Procedure
- Turn the ignition switch to the ON position.
- Install the scan tool.
- Select IMMOBILIZER PROGRAMMING FUNCTION from the BODY menu.
- Follow the scan tool instructions with each key until all keys are programmed.
- Cycle the ignition 3 times as indicated by the scan tool.
- Turn the ignition to the LOCK position, disconnect the scan tool and test all the keys.
- If any key does not function, perform this procedure again with all keys.
- If any key does not accept the programming, replace it with a new key and perform this procedure again with all the keys.
