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. Vehicle Platform: F4 (Bolt) / F5 ( Zest) / TIAGO / TIGOR / EAGLE/OSPREY/Q5/X451 ECU Name: Hella Body Control Module (BCM) ECU Replacement Procedure Version: 3.9 Date: 09-June-2022 Author: BCM CoC Page: 17 of 39 }// END else if (XX == 01 && YY==01) 17.2. AES_SK Unlocking Procedure PEPS: Write same AES_SK code (using tester tool) in PEPS as well. Before writing check whether AES_SK is locked for writing or not, send service request $22 44 1C and read the response. If response is ‘00’ i.e. 62 44 1C 00 then unlocking of AES_SK is required before writing, else if response is ‘01’ i.e. 62 44 1C 01 then start writing AES_SK key immediately. AES_SK Unlocking Procedure PEPS: i. Send service request $ 31 01 4F 0B ii. Check Start routine response of the routine 71 01 4F 0B XX YY XX = RoutineStatusRecord, RoutineInformation, YY = Response additional data. iii. If (XX == 01 && YY==01) { Successful }// END if (XX == 01 && YY==01) Else { Unsuccessful }// END else if (XX == 01 && YY==01) 18. Confirm the AES_SK code from BCM-PEPS ECU as identical. 19. Configure and pair the keys with LIN based IMMO BCM using following steps (Note : - in case of CAN based IMMO (with VICM ECU) and PEPS ECU present, then skip this step (19) and go to step number 20 (Configure the BCM ECU (parameterization of BCM ECU))). : - a. Select “Pairing” main option from TDS Tool. Give ECU reset (Diagnostics Request) ($11 01). Wait for 3 sec after reset. b. Enter into Diagnostic Session = Extended. (Send service request $10 03). c. Unlock the ECU for performing EOL operations i.e. for writing configuration parameters and flashing. Perform the following steps: i. Request Security Access Seed (Send service request $27 07). ii. Process the got 4 byte (XXXX) seed to Produce 4 byte security key. iii. Send the security key to unlock the ECU. (Send service request $27 08 YYYY).
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