Part Replacement strategy IVI IC SVS Reflashing and Replacement spec Version: 0.7 Draft Released On: June 21, 2023 Copyright © Tata Motors Ltd. Page 20 of 34 Step 21. Flash TLS Certificate Below is the list of TLS certificates to be flashed at TML Service center. Table 5: TLS certificates Sr. No Certificate Description 1 (TLS1) TCM-HU TLS certificate (If Telematics ECU is present) Certificate required for secure communication between Infotainment and telematics ECU. 2 (TLS2) HU TML cloud TLS certificate Certificate required for secure communication between Infotainment and TML cloud via telematics or Wi-Fi. Step 22. Certificate injection process in HU at TML Service center Figure 7: Certificates injection process Figure 8: Certificate injection process in HU at TML Service center Step 23. Steps for injecting certificate at TML service center (applicable to both certificates) Table 6: Certificate injection steps Process Responsibility Activity Output sd Certificate injection via service tool after expirry of certificate TML Certificate Mangement Cloud Plant Server HU Service tool alt if flashing fails retry 3 times «sw logic» Precondition: Assign certificate to respective HU unique ID() Request for HU unique ID, VIN and other required parameter() «DID request» Provide HU unique ID, VIN and other required parameter() «DID response» Request for certificate assigned for HU unique ID() Request for certificate assigned for HU unique ID() Provide new HU certificate as per unique ID and revoke the previous one() Provide HU certificate as per unique ID() convert the certificate in the S19 format() Flash HU certificate as per HU unique ID() «CAN» Retry flashing HU certificate() «CAN» Certificate flashed status ack() «CAN» converting in required format and install() Certificate flashed status ack() «CAN»
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