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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.
Tata Bolt / Zest / Tiago/ Tigor – 4 Loop – Restraints Control Module (SRS / Airbag)
ECU Replacement Procedure
Version: 3.1
Date: 24-Feb-2017
Author: Airbag CoC, ERC
Page: 3 of 6
l.
Clear DTC’s and check for DTC’s.
m.
Check the Warning Lamp in Instrument Cluster. (
After prove out SRS warning lamp
should be off in Instrument Cluster, if no faults are qualified in SRS ECU
)
n.
Read ECU data after successful writing and compare it with PLM server data for the
respective VC:
1.
VIN (Vehicle Identification) number ($22 F1 90)
2.
ECU installation date ($22 F1 9D)
3.
ECU assembly number ($22 72 34)
4.
ECU parameterization number ($22 72 44)
5.
System Configuration ($22 40 10)
6.
CAL parameter number ($22 40 11) (
Unique identification number of
Calibration
). Also compare the CAL parameter ID (last 3 bytes of the response)
with the server data.
7.
ECU Customer mode ($22 40 13)
Steps for SRS (Airbag) ECU cannibalizing (try out) during Service
:
Please refer Annexure 1 of SRS ECU Serviceability document version 2 (Serviceability_SRS_ECU_v
2.doc).
Cannibalization meaning: - to remove a part from a vehicle to repair or make a similar unit.
1.
Connect the Service tool to vehicle OBD connector.
2.
Turn ON Ignition, Clear the DTC’s and Check for DTC’s in both the Airbag ECU’s.
3.
Read the ECU Assembly number ($22 72 34) using service tool and compare it with Look up
table/PLM server (or with old ECU) as per defined VC. It should match with the existing ECU
data.