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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: 104 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.
B221A– 12: Headlamp On Signal – circuit short to battery
Overview:
ISO Code
B221A - 12
Customer Symptom
Headlamp always OFF
Fault Effects (On Vehicle)
Headlamp lamps always OFF
Lamp Status (If Any)
Always OFF
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 fault is detected for Headlamp
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. Cockpit Headlamp switch input wire Short to battery
3. Switch damaged or stuck
4. BCM ECU fault
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
HeadlampON switch is part of combi switch. If the IGN is at ACC/ON position and through combi switch head
lamp are turned ON then headlamps will turn ON.
Preliminary Checks:
1. Check Battery Voltage ( 9 V & above)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-