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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: 499 of 855
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TATA MOTORS Ltd.
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B2238- 23: Rear Defogger switch circuit short to GND
Overview:
ISO Code (DTC Code)
B2238-23
Customer Symptom
Every time vehicle enters into RUN mode is switched
ON, Rear defogger switches ON for 15 mins.
Fault Effects (On Vehicle)
Unintended switching ON of rear defogger for one
cycle(15 mins)
Lamp Status (If Any)
Rear Defogger LED switches ON for 15 mins every time
vehicle in RUN mode.
Fault Detection Condition
DTC logged during rear defogger switch is operated
DTC logged in RUN/ IGN ON mode.
Normal Operating Condition
No DTC logged when vehicle in RUN mode and rear
defogger switch is switched ON. Rear defogger shall
operate for 15 minutes without logging any DTC.
Probable Trouble Area
1. Switch stuck low
2. Wiring harness short to GND
3. BCM fault
4. BCM connector fault
Healing Condition
RUN the vehicle and operate rear defogger switch. Let
rear defogger be ON for first cycle(15 mis) and rear
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.
Preliminary Checks:
1. Check Battery Voltage (9V-16V)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-