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Vehicle Platform: OSPREY
ECU Name: Hella Body Control Module (BCM) DTC
Troubleshooting Data
Version: 1.4
Date: 15 May 2018
Author: Body CoC
Page: 804 of 855
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 DTCB1326 – 12
logged by Routine?
Disconnect vehicle battery connection.
(Please follow the safety guidelines)
Check BCM and
Express Down switch
connector for terminal blackout
Are connectors loose?
1.Remove BCM Connector.
2.Perform visual check of connectors for pins bent or damaged.
Is connector
faulty?
Check continuity between BCMconnector
pin
Harness side with
battery
Continuity
Found?
1. Remove Express Down switch connector
2. Check continuity between BCMharness side connector pin and Express
down output signal
STOP
YES
NO
YES
NO
Reconnect connectors firmly
Correct connector fault
(Terminals Bend)
YES
NO
Correct BCM Sidewiring harness
(Short to Battery)
NO
YES
B1326 - 12: Express Down Output - 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 Express down output signal
with
ground
Continuity found?
BCM ECU Faulty
Correct wiring harness
(Open Circuit)
YES
NO
Correct connector fault
(Terminal Bend)
Correct connector fault atExpress down
switch connector
(Open Circuit)
YES
NO
YES
NO
Replace BCM ECU
Continuity found?
YES
NO
1. Switch is faulty
2. Replace Express
down output
switch
Check continuity between two
terminals of Express down switch