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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: 484 of 737
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TATA MOTORS Ltd.
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B2238- 12: Rear Defogger switch circuit short to BATT
Overview:
ISO Code (DTC Code)
B2238-12
Customer Symptom
Rear Defogger will not switch ON even though after
switch request.
Fault Effects (On Vehicle)
1. Rear Defogger remains OFF.
Lamp Status (If Any)
NA
Fault Detection Condition
DTC logged during input switch test routine.
Normal Operating Condition
No DTC logged during input switch test routine.
Probable Trouble Area
1. Switch damage
2. Wiring harness short to BATT
3. BCM fault
4. BCM connector fault
Healing Condition
1. Run Input Switch test routine DTC.
2. Read DTC, no DTC shall be logged
Component Details:
Rear Defogger switch(part of fascia switch) is a non-latchable switch. Hence BCM detects GND at this input pin till the
switch is pressed. Short to BATT indicates the BCM detects as switch not pressed condition.
Preliminary Checks:
1. Check Battery Voltage (9V-16V)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-