TIAGO TIGOR BSVI - SERVICE MANUAL - DTC 24-12-2021

Vehicle Platform: Zest, Bolt, Tiago, Tigor, Osprey, Q501, X451, Q502 ECU Name: Hella Body Control Module (BCM) DTC Troubleshooting Data Version: 3.1 Date: 30-11-2019 Author: BCM COC Page: 621 of 1106 Copyright © 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) 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 Switch stuck low Wiring harness short to GND BCM fault BCM connector fault Healing Condition Run Input Switch test routine DTC. 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.