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Vehicle Platform: Tiago,Tigor & Osprey
ECU Name: Hella Body Control Module (BCM)
DTC Troubleshooting Data
Version: 2.0
Date: 22-10-2018
Author: Parag K
Page: 326 of 737
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.
START
Connect Diagnostic tool and Run Input Test Routine and operate the
switches as mentioned in the input switch test routine specification.
Is DTC B1301 – 12
logged by Routine?
Disconnect vehicle battery connection.
(Please follow the safety guidelines)
Check BCM and
Driver door switch connectors
for terminal backout
Are connectors loose?
1.Remove BCM Connector.
2.Perform visual check of connectors for pins bent or damaged.
Is connector
faulty?
Check continuity between BCM connector pin
[ C1-
1
] Harness
side) with battery
[C3-2/C3-1]
Continuity
Found?
1. Remove
Driver door switch
2. Check continuity between BCM harness side connector pin
[ C1-
1
] and
Driver door switch
[C101-1]
STOP
YES
NO
YES
NO
Reconnect connectors firmly
Correct connector fault
(Terminals Bend)
YES
NO
Correct BCM Side wiring harness
(Short to Battery)
NO
YES
B1301 - 12: Driver Door Ajar Switch - Circuit short to Battery or Open Circuit
Open Circuit?
Perform the visual check of connectors for pin bend or
damaged
Is connector faulty?
Check continuity at Driver door switch
[C101-1]
with
ground
[C1-34/C1-47]
Continuity found?
BCM ECU Faulty
Correct wiring harness
(Open Circuit)
YES
NO
Correct connector fault
(Terminal Bend)
Correct connector fault at Driver door
switch mating connector
(Open Circuit)
YES
NO
YES
NO
Replace BCM ECU
Continuity found?
YES
NO
1. Switch is faulty
2. Replace
Driver
Door switch
Check continuity between two
terminals of Driver door switch
DTC’s confirmation: