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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: 254 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
TURN ON IGNITION.
CONNECT THE
DIAGNOSTIC TOOL AND CHECK FOR DTC’s
IS DTC
PRESENT?
CLEAR DTC
’s. TURN OFF & ON
IGNITION & CHECK FOR DTC’s
.
IS RESISTANCE
OK?
YES
NO
NO
YES
NO
YES
TURN OFF
& ON THE
IGNITION
&
CHECK FOR
DTC’s
NO
RUN THE VEHICLE FOR A FEW MINUTES &
CHECK FOR DTC
B100B1F)
(
MATURATION &
DEMATURATION IN RUNNING CONDITION.
1.
CLEAR DTC. TURN OFF AND ON IGNITION.
2.
CHECK WHETHER THE DTC
B100B1F
IS
GETTING MATURED?
REPLACE
PAD SWITCH
CLEAR DTC’s. TURN OFF & ON IGNITION &
CHECK FOR DTC’s
REPLACE
RESPECTIVE
WIRING
HARNESS
RE-CONNECT
THE AB
ECU,
PAD SWITCH
&
AB W/H IN
THE
VEHICLE
YES
NO
1) DISCONNECT THE PAD SWIT
CH FROM VEHICLE
WIRING HARNESS.
2) CHECK WHETHER THE RESISTANCE ACROSS
THE
PINS
C225-1 & C225-2 OF PAD SWITCH
IS:
a)
SWITCH IN CLOSED CONDITION IS 100
-
10% Ω
b)
SWITCH
IN OPEN
CONDITION IS 400
+
%Ω
10
YES
YES
IS DTC
STILL
PRESENT?
NO
IS DTC
STILL
PRESENT?
IS DTC
STILL
PRESENT?
CLEAR DTC. TURN OFF & ON
IGNITION. AND CHECK WHETHER
DTC IS STILL PRESENT
REPLACE THE
AIRBAG ECU
STOP
YES
NO
START
B100B1F::
Passenger Airbag
Deactivation
switch(PADS)
circuit
intermittent.