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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: 480 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.
B2238- 11: Rear Defogger switch circuit short to GND/ Open
Overview:
ISO Code (DTC Code)
B2238-11
Customer Symptom
Every time vehicle enters into RUN mode is switched
ON, Rear defogger switches ON for 15 mins.
Fault Effects (On Vehicle)
1. Unintended switching ON of rear defogger.
Lamp Status (If Any)
Rear Defogger LED switches ON for 15 mins every time
vehicle in RUN mode.
Fault Detection Condition
DTC logged during Input switch routine
Normal Operating Condition
No DTC logged during Input switch test routine
Probable Trouble Area
1. Switch stuck low
2. Wiring harness short to GND
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.
Preliminary Checks:
1. Check Battery Voltage (9V-16V)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-