HARRIER BOOK 2

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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: 342 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 B1306 – 12
logged by Routine?
Disconnect vehicle battery connection.
(Please follow the safety guidelines)
Check BCM and Rear Left 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 [ C4-17] Harness
side) with battery [C3-2/C3-1]
Continuity
Found?
1. Remove Rear Left door switch
2. Check continuity between BCM harness side connector pin [C4-17] and
Rear Left door switch [C104-1]
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
B1306 - 12: Left Rear 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 Rear Left door switch [C104-1] 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 Rear Left
door switch mating connector
(Open Circuit)
YES
NO
YES
NO
Replace BCM ECU
Continuity found? YES
NO
1. Switch is faulty
2. Replace Rear
Left Door switch
Check continuity between two
terminals of Rear Left door switch