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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: 169 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.
B221F – 15: Left Front Fog Lamp Circuit – Short to Battery or Open Circuit
Overview:
ISO Code
B221F – 15
Customer Symptom
1. Left Front Fog Lamps always ON.
2. Facia Switch illumination for rear fog lamp always ON
Fault Effects (On Vehicle)
1. Left Front Fog Lamps always ON.
2. Facia Switch illumination for rear fog lamp always ON
3. Battery drain
Lamp Status (If Any)
Always ON
Fault Detection Condition
This fault gets logged by BCM when left front fog lamp output
is shorted to battery or open circuit
Normal Operating Condition
If the IGN is ON and headlamps / position lamps are ON then
front fog lamps turn ON immediately after pressing the front
fog lamp switch.
Probable Trouble Area
1. BCM connector Fault
2. Left front fog lamp output wire Short to battery or
open circuit
3. Left front Fog Lamp bulb blown /lamp damaged
4. BCM ECU fault
5. Left front fog lamp mating connector fault
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
Left front fog lamps are located at left front side of vehicle. If the IGN is ON and headlamps / position lamps are
ON and user presses the front fog lamp switch then front fog lamps turn ON.
Preliminary Checks:
1. Check Battery Voltage (12.5 V & above)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-