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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: 474 of 737
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TATA MOTORS Ltd.
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B221E - 15: Heated Rear Windscreen Relay - circuit short to battery or open
Overview:
ISO Code (DTC Code)
B221E - 15
Customer Symptom
1.
Rear window always heated without input
2.
In case of ETC variant CCM LED always OFF on user
request.
3.
In case of FATC variant CCM LED always OFF on
user request.
Fault Effects (On Vehicle)
1. Rear de-fogger always off
2. Battery discharge
Lamp Status (If Any)
NA
Fault Detection Condition
If engine is running and rear-defogger is requested ON and
the rear defogger relay is shorted to battery or open.
Normal Operating Condition
Rear window will be started heating only on user request.
Probable Trouble Area
1.
BCM Cockpit Wiring harness faulty
2.
BCM connector Fault
3.
Infotainment ECU Fault
4.
BCM ECU fault
Healing Condition
1.
Ignition OFF
ON
2.
Clear DTC Command
Component Details:
If engine is running with more than 600 rpm, the Rear Defogger would be started by pressing Rear Defogger
switch either on the FACIA switch bank or on FATC control panel.
Preliminary Checks:
1. Check Battery Voltage (9V-16V)
2. Check ECU pins for oxidation, bending & damage.