PAIRING OF VCU-ECU & LIN BASED BCM IMMOBILIZER: A. For replacing only LIN based BCM Immobilizer: Start the Diagnostic software and select • “TATA_Antitheft_Immobilizer” option. Now click on the “Pair with VCU ECU” button • and follow the instructions. B. For replacing only VCU-ECU Unit: Start the Diagnostic software and select specific vehicle model (1.05L CRAIL / 1.2 NA NG) option and in that click on “ECU Functions MORE” option. Now click on the “Pair with IMMO” button and follow the instructions. C. For replacing both VCU-ECU and ICU Units: Start the Diagnostic software and select • “TATA_Antitheft_Immobilizer” option. Now click on the “Write VIN No” button and • enter the VIN number. Now click on the “Pair with VCU ECU” button • and follow the instructions. After this stage, come out of the “Immobilizer” • option and go to “VCU-ECU” option. Click on “Pair with IMMO” option and follow • the instructions. D. Checking Pairing status: In the VCU-ECU software select “Engine Parameter 1”, then select “Electronic key” option and click START. One window will pop-up & shows below mentioned options. This window gives the current status of immobilizer system. i.e. Immo Programmed: Immobilizer enabled. • Vehicle Not Locked: Vehicle ready for start. • Vehicle locked: Vehicle will not start • Immo code programmed and locked: Pairing • operation OK. AES key is written in to VCU and locked. Immo code programmed and unlocked: • Pairing operation not done properly. AES key is written in to VCU and Unlocked. Key code OK / Authentication OK: AES key • for VCU ECU and ICU are same. Free starts Inactive: After locking AES, free • starts are inactive. If AES is not locked free starts is active for 5 times. Immo CAN Communication OK: Proper • communication. Otherwise it will show CAN communication “OFF”. NOTE In Software version-1.6, VIN number entry is not required for replacing only one control unit). LIN based IMMO configuration in BCM and the keys pairing shall be done as per step 19th in “BCM ECU replacement procedure”. NOTE in Version – 1.6 software, VIN number entry is not required for replacing only one control unit). CAUTION As AES key is based on VIN no, proper care should be taken while reading and writing of VIN No. & it cannot be changed once it is written into the ICU. Any irregularity in the above procedure may leads to vehicle immobilization, in spite of new Immobilizer. LOW VOLTAGE ELECTRICAL SYSTEM (LV) 174
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