Determining the secret number
If the 4-digit secret number is not known or the new vehicle key fob with the secret number is not available, the secret number must be requested from the WIN system code retrieval system by supplying the 14-character immobilizer control module identification number.
The 14 digit identification number of the Engine Control Module (ECM) or control module for anti-theft immobilizer can be read out via the "Check control module version" function of On Board Diagnostic (OBD).
NOTE:
Effective calendar date 03.11.2002, the immobilizer secret number is encoded for increased security. The encoded number is now 7-digits and is referred to as a "PIN" ("Personal Identification Number"). The associated process is also new. See ANTI-THEFT IMMOBILIZER ON BOARD DIAGNOSTIC (OBD), INITIATING
.