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: 3.5 Date: 27-Jan-2020 Author: BCM CoC Page: 13 of 34 Caution – This is an essential step without unlocking the security access further steps will not be executed. f. Read Assembly Number (7234) and compare against server. If new Software is found in the server against above parameters, then automatically download the flashing files. g. Before flashing the BCM ECU, Execute the routine 200D(Routine for check Reprogramming Preconditions), if response is 0x00 proceed for flashing the BCM ECU, else if it is 0x01 display the message as “Check the preconditions IGN ON, Voltage 9v to 16v, Vehicle speed = 0kmph, Engine speed = 0rpm, Acceleration Peddle position = 0%, Gear = Park(AMT vehicle)”. 16. Update BCM ECU VIN & VC with following procedure a. Turn the IGN ON again and Unlock security to BCM ECU with the help of diagnostic tool. b. Read VIN & VC from BCM ECU (22 F1 90 & 22 72 35) and compare with VIN and VC from IC ECU. c. If VIN and VC mismatched then execute following step d and e to write correct VIN and VC into BCM ECU. d. Write correct VIN in BCM ECU (2E F1 90 XX XX . . . . . ) e. Write correct VC in BCM ECU (2E 72 35 XX XX . . . . . ) f. Read VIN & VC from BCM ECU (22 F1 90 & 22 72 35) and verify once again with IC ECU. 17. AES writing Procedure 17.1. AES writing Procedure in BCM: Note- “AES key writing in BCM is applicable for the trims wherever PEPS Enable is applicable” Generate AES_SK code (using tester tool) and write AES_SK code into BCM. Before writing check whether AES_SK is locked for writing or not, send service request $22 42 23 and read the response. If response is ‘01’ i.e. 62 44 1C 01 then unlocking of AES_SK is required before writing, else if response is ‘00’ i.e. 62 44 1C 00 then start writing AES_SK key immediately
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