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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: 357 of 737
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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.
B1620 - 12: Other Doors Switch - Circuit short to Battery or Open Circuit
Overview:
ISO Code
B1620 - 12
Customer Symptom
1. Interior Roof lamp in Auto mode selection doesn’t
operate when Other Doors is/ are opened.
2. The IC shows Other Doors as closed status, even if
the Other Doors 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.
NOTE:
Here, Other Doors means Passenger door, Rear Left Door
and Rear Right Door
Fault Effects (On Vehicle)
1. Interior Roof lamp in Auto mode selection does not
operate when Other doors is/ are opened.
Lamp Status (If Any)
1. Roof lamp in Auto mode selection is OFF.
2. IC shows Other Doors 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
Other Doors 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 and Right side wiring harness Short to
battery or open circuit
3. Other Doors Ajar Switch is damaged or stuck or faulty
4. BCM ECU fault
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
Other Door Ajar Switch, BCM connector
Functionality:
If the Other door state is short to Battery or Open Circuit, then the Other door state is in closed state.
If the Other door is closed, then BCM shall receive the feedback of Other doors as closed status.
Preliminary Checks:
1. Check Battery Voltage (12.5 V & above)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting: