NEXON BSVI MCE - SERVICE MANUAL

ELECTRICAL 106 CONNECTION DIAGRAM CONNECTION DETAILS OF PIN IMMOBILIZER CONNECTOR INSTRUMENT CLUSTERCONNECTOR Status bulb Pin -5 Pin 20 IMMOBILIZER CONNECTOR EMS VEHICLE CONNECTOR PIN NO. DIESEL PETROL CAN_H Pin 3 Pin 19 Pin 19 CAN_L Pin 8 Pin18 Pin18 IMMOBILIZER CONNECTOR & PIN OUT DETAILS XE - 4 PIN CONNECTOR PIN SIGNAL NAME USED LEVEL NOMINAL OPERATING CURRENT AT 13.5V 1 LIN Y 500 µA 2 INTERNAL_12V Y HIGH 100 mA 3 - N NA 4 GND Y NA Key ring illumination Immobilizer earthing PIN SIGNAL NAME PIN SIGNAL NAME 1 KEY RING SUPPLY 1 IMMO GND 2 GND 2 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 be possible to learn the new keys for that immobilizer, as original key is required during E-key learning operation. IMMOBILIZER SYSTEM STATUS  During Ignition off, immobilizer status bulb (“Lock” symbol on the instrument cluster) blinks, indicating Immobilizer is awaiting E-key.  When the ignition key is turned to the “ON” position, if the status bulb goes OFF indicates that the system is working and the vehicle is unlocked (Engine is ready to start). If the status bulb is continuously ON, there may be something wrong with key or with the immobilizer system.