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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: 396 of 549
DTC’s confirmation:-
After rectification, ensure the following points using TML diagnostic tool before handing over to customer.
e) Clear the DTC’s & make sure no DTC’s are present for Airbag system
f) Check whether any new DTC’s are getting qualified for repeated cranking.
g) Ensure the Airbag Warning Lamp Indication is continuously ON in Instrument Cluster for
4 seconds
after
Ignition ON
h) 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
TURN ON IGNITION. CONNECT THE
DIAGNOSTIC TOOL AND CHECK FOR DTC’s
IS DTC
PRESENT?
CLEAR DTC
IS DTC STILL
PRESENT
?
1. TURN OFF IGN,
REMOVE DSP
SENSOR
CONNECTOR FROM VEHICLE W/H.
2. TURN ON IGNITION. CLEAR DTC’s & CHECK
FOR DTC’s.
IS DTC B100C-
12 PRESENT?
REPLACE
THE
DSP
SENSO
YES
NO
NO
YES
NO
YES
TURN OFF
& ON THE
IGNITION &
CHECK FOR
DTC’s
IS DTC
PRESENT?
NO
CHECK WHETHER
THE VOLTAGEAT
OUTPUT PINS OF W/H
W.R.T VEHICLE GROUND
IS IN THE RANGE
OF 10 TO 12 V
STOP
RE-CONNECT
THE ECU,
DSP
SENSOR
& W/H
MODULE IN
THE VEHICLE
NO
YES
REPLACE THE
DSP
SENSOR
IS VOLTAGE IS
IN 10 T0 12 V?
REPLACE AIRBAG ECU
WITH A NEW ONE.
YES
YES
NO
1.
TURN OFF IGN. REPLACE AIRBAG W/H.
2.
CONNECT THE AIRBAG ECU, W/H &
DSP IN VEHICLE.
3. TURN ON IGNITION. CLEAR DTC’s & CHECK
FOR DTC’s.
IS DTC B100C-
12 PRESENT?
START
B100C12
.
C321B-1& C321B-2