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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: 341 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.
B1306 - 12: Left Rear Door Ajar Switch - Circuit short to Battery or Open Circuit
Overview:
ISO Code
B1306 - 12
Customer Symptom
1. Interior Roof lamp in Auto mode selection doesn’t
operate when Rear Left door is opened.
2. The IC shows Rear Left door as closed status, even if
the Rear Left door is opened as presumed by the
customer.
3. The Mis-lock sound does not occurs on RKE lock
command.
4. The vehicle will get lock on RKE lock command.
Fault Effects (On Vehicle)
1. Interior Roof lamp in Auto mode selection does not
operate when L door is opened.
Lamp Status (If Any)
1. Roof lamp in Auto mode selection is OFF.
2. IC shows Rear Left door closed status always
Fault Detection Condition
This fault will be logged after the input switch test routine
execution. User has to operate the switch manually during
routine. If short to battery or open circuit fault is detected for
Left Rear Door Ajar Switch, then this DTC code will be
returned with the routine results.
Normal Operating Condition
There should not be any fault returned by routine
Probable Trouble Area
1. BCM connector Fault
2. Left side wiring harness Short to battery or open
circuit
3. Left Rear Door Ajar Switch is damaged or stuck or
faulty
4. BCM ECU fault
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
Rear Left Door Switch, BCM connector
Functionality:
If the Rear Left Door Switch is short to Battery or Open Circuit, then the Rear Left door state is in closed state.
If the Rear Left door is closed, then BCM shall receive the feedback of Rear Left door as closed status.
Preliminary Checks:
1. Check Battery Voltage (12.5 V & above)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting: