Copyright © TATA MOTORS Ltd. This document must not be used in any way, such as copying and redistributing to third parties, without the consent of author. Restraints Control Module AB12 (SRS / Airbag) ECU Replacement Procedure Version: 4.0 Date: 15-July-2021 Author: Airbag CoC, ERC Page: 11 of 14 (Send service request $27 01 XXXX) 2. Process the received 4-byte seed to calculate 4-byte security key. 3. Send the security key to unlock the ECU. (Send service request $27 02 YYYY) YYYY – This represents 4 byte Key value 4. Write Programming Date DID (Based on Calibration / Application file selected) ($2E either 7223 / 721B Data) 5. Write Repair Shop Code DID (Based on Calibration / Application file selected) ($2E either 7225 / 721D Data) 6. Write tester Serial Number DID (Based on Calibration / Application file selected) ($2E either 7224 / 721C Data) 7. EraseMemoryRoutine FF00h(erase a single block) Send service request (31 01 FF 00 xx xx xx xx yy yy yy yy) Response (71 01 FF 00 01 00) xx xx xx xx –Address of 4-byte yy yy yy yy – length of 4-byte 8. Request to Download Send service request (34 00 44 xx xx xx xx yy yy yy yy) Response (74 00 0F F2) xx xx xx xx - address of 4byte yy yy yy yy – length of 4byte 9. TransferDataService(flash a single block) Send service request (36 xx Data) Response (76 xx) Repeat the step until all the data is transferred xx - sequence counter
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