Part Replacement strategy IVI IC SVS Reflashing and Replacement spec Version: 0.7 Draft Released On: June 21, 2023 Copyright © Tata Motors Ltd. Page 21 of 34 Step-1 TML service tool to read VIN, HU Unique ID, etc… via DIDs Read VIN, HU Unique ID, etc… Step-2 TML service tool to pass on VIN, HU Unique ID to TML Send HU Unique ID, VIN, etc… Step-3 TML service tool to request for new certificate using REST API Request for new certificate Step-4 TML TML server to generate new certificate for specific HU Unique ID generation of new certificate Step-5 TML TML server to provide text content of certificate in .pem file in JSON format JSON without signed Step-6 TML service tool to convert .JSON format to .s19 format and its generate CRC for S19 s19 without signed Step-7 TML service tool to inject .s19 format in specific HU using UDS service certificate injection Step-8 TML service tool to check S19 CRC CRC check Step-9 HU Supplier HU to convert S19 --> .JSON --> required certificate format required format conversion of certificate Step-10 HU Supplier HU Supplier to check for intended HU Unique ID and VIN(TBD), if ok then flash the certificate verification and certificate installed in HU Step-11 TML service tool to read the new cert installation status using DIDs and confirmed to technician in service tool confirmation to technician For additional details refer below specification Refer Document: TML Gen3 Certificates and keys specs
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