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TATA MOTORS Ltd.
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SRS / Airbag
ECU – DTC Troubleshooting Guide
Version: 14.0
Date: 14-February-2017
Prepared by:Airbag COC Review &
Approved by:Sanjeev VM
Page: 258 of 549
DTC’s confirmation:-
After rectification, ensure the following points using TML diagnostic tool before handing over to customer.
a) Clear the DTC’s & make sure no DTC’s are present for Airbag system
b) Check whether any new DTC’s are getting qualified for repeated cranking.
c) Ensure the Airbag Warning Lamp Indication is continuously ON in Instrument Cluster for
4 seconds
after
Ignition ON
d) Ensure the Airbag Warning Lamp Indication goes OFF after
4 seconds
from Ignition ON.
Circuit Schematic Diagram:-
Schematic shown below for illustration
Battery>>>>>Fuse>>>>Relay>>>>>>>Sensor/Actuator>>>>>ECU
IS DTC
PRESENT?
CLEAR DTC. TURN OFF & ON IGNITION
&
CHECK FOR DTC’s (at least 2 to 3 times).
IS DTC
STILL
PRESENT
?
1. READ EXISTING
AIRBAG
ECU
SYSTEM
CONFIGURATION USING
EOL
or SERVICE
TOOL.
2.
VERIFY WHETHER T
HE VEHICLE
IS HAVING
THE CORRECT
AIRBAG ECU SYSTEM
CONFIGURATION AS PER THE
VC?
IS CONFIG.
CORRECT
?
WRITE CORRECT
SYSTEM
CONFIGURATION IN
AIRBAG ECU USING EOL
or SERVICE TOOL
YES
NO
NO
YES
NO
YES
TURN OFF &
ON THE
IGNITION
&
CHECK FOR
DTC’s
IS DTC
STILL
PRESENT?
NO
1.
TURN OFF IGNITION &
CHECK THE VEHICLE
WIRING HARNESS
FOR ANY DEVICES
CRASH
(
OUTPUT HARDWARE (CRO))
PHYSICALLY
PRESENT, BUT NOT
REQUIRED AS
PER
VEHICLE REQUIREMENT.
2.
REMOVE THE WIRING FOR THE DEVICE
(CRO)
NOT REQUIRED AS PER VEHICLE
REQUIREMENT.
STOP
RE-CONNECT
THE ECU,
CRASH OUTPUT
HW & W/H
MODULE IN
THE
VEHICLE
YES
START
B101055::
Crash Output
Hardware not
configured
.
TURN ON IGNITION.
CONNECT THE
DIAGNOSTIC TOOL AND CHECK FOR DTC’s