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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: 281 of 855
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TATA MOTORS Ltd.
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B220A – 23: Front Fog Lamp Control Switch – Signal Stuck Low
Overview:
ISO Code
B220A - 23
Customer Symptom
Front fog lamp does not operate.
Fault Effects (On Vehicle)
1. Front Fog lamp will not come ON
2. Facia Switch illumination for fog lamp will not
turn ON
Lamp Status (If Any)
Always OFF
Fault Detection Condition
This fault gets logged by BCM; if signal stuck low
condition is detected for front fog lamp switch.
Normal Operating Condition
If the IGN is ON and headlamps / position lamps are ON
then front fog lamps shall turn ON immediately after
pressing the front fog lamp switch.
Probable Trouble Area
1. BCM connector Fault
2. Front fog lamp switch input wire Short to ground
from cockpit wiring harness
3. Switch damaged or stuck
4. Facia Switch connector fault.
5. BCM ECU fault
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
Front fog lamp switch is part of facia switch bank. If the IGN is ON and headlamps / position lamps are
ON and user presses the front fog lamp switch, front fog lamps will turn ON.
Preliminary Checks:
1. Check Battery Voltage (12.5 V & above)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-