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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: 488 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- 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)
1.
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
1. 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:-