ELECTRICAL 235 CONNECTION DIAGRAM: IMMOBILIZER CONNECTOR EMS VEHICLE CONNECTOR PIN NO. A _H Pin 3 Pin 64 CAN_L Pin 8 Pin40 IMMOBILIZER WORKING PRINCIPLE: The EMS ECU and the immobilizer are paired together by an encrypted secret code called as “AES secret key”, to improve the security of the vehicle. This AES secret key is generated using the vehicle identification number (VIN) and it is unique for each vehicle. Both immobilizer and the EMS ECU are programmed with same secret key for mutual authentication. If any one of EMS or ICU has different/ wrong secret key, vehicle will be locked (engine cannot be started). If EMS or Immobilizer is changed in a vehicle, it is required pairing operation (EMS ECU & ICU programmed with same secret key) for proper mutual authentication. The pairing of EMS and Immobilizer can be done through diagnostic tester. These E-keys are learned for that immobilizer and are unique to that Immobilizer & vehicle. The E-key of other vehicles will not work with this immobilizer and vice versa. If anyone of the E-key is lost, it is recommended to approach TATA AUTHORIZED dealer for new E-key. It is possible to learn new keys with the help of diagnostic tester (Refer the key learning procedure). If both the keys are lost, it is not being possible to learn the new keys for that immobilizer, as original key is required during E-key learning operation.
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