Vehicle Platform: All ECU Name: Telematics Control Unit (TCU) DTC Troubleshooting Data Version: 1.12 Date: 02-06-2022 Author: TCM COC Page: 68 of 150 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. U1605 - 09:- Internal Control Module Battery - Component Failures Overview: ISO Code U1605 – 09 Internal Control Module Battery - Component Failures Customer Symptom Telematics ECU features will not be working Fault Effects (On Vehicle) Remote , Vehicle security, Alerts and other telematics features will not be working Fault Detection Condition DTC is set in case of component failure on Internal Control Module Battery Normal Operating Condition TCU having proper internal battery in normal condition. Probable Trouble Area Internal battery is damaged Faulty TCU Internal Component failure connector problem with internal battery Internal battery connector is open/short Healing Condition 1. Verify DTC ageing-Clear in case of ageing 2. Verify any other communication related DTCs present 3. Verify TCU DTCs and check for any related DTCs 4. Follow TCU trouble shooting guideline to clear the relevant functional DTCs 5. Replace internal battery 6. If problem persists after above steps (from 1 to 5) then replace TCU
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