User's Manual

Title : User manual of IM900 Immobilizer Spec. No. : N/A
Written by : SUNG HUN AHN Rev. No. : Revision A
Date :2007.11.07 Page : 3 / 10
Technical Center Automotive Electronics
1 Introduction
This document is user manual & description of function of immobilizer with crypto transponder based on the
GM GMLAN Global Architecture immobilizer system consist of Pass Key III Plus. IM900 (hereinafter
Immobilizer or ICU) is designed to meet the GM global architecture requirements.
The purpose of the DPI Immobilizer System is to provide additional theft deterrence to the vehicle in which
it is installed and to prevent it from being driven by unauthorized users. The verification of the user
authorization is done by using an Accessory key with integrated transponder.
2 System Description
The Immobilizer system consist of
• a maximum of 10 Accessory keys is learned with integrated transponder,
• the Coil Antenna for energizing and reading the transponder mounted at the Accessory lock,
• the Immobilizer control unit(ICU) with :
• the external LED provided by instrument cluster or clock module status message for displaying the
Immobilizer status,
• the serial data link between Immobilizer, Gateway and ECM and