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

Vehicle Platform: NEXON, X4, Q5, TIGOR_MCE ECU Name: PEPS DTC Troubleshooting Data Version: 1.7 Date: 01 Aug 2019 Author: Rajasekhara Reddy Page: 85 of 389 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. B1649 - 14:- ACC Relay Feedback - circuit short to ground or open Overview:- ISO Code (DTC Code) B1649 - 14 Customer Symptom During IGN cycle, LED color should change in sequence of LED OFF – LED OFF – Green ON – LED OFF with every press of the Engine start/stop button. Fault Effects (On Vehicle) During IGN cycle, LED color should change in sequence of LED OFF – LED OFF – Green ON – LED OFF with every press of the Engine start/stop button. Lamp Status (If Any) NA Fault Detection Condition During IGN OFF. Normal Operating Condition During IGN cycle, LED color should change in sequence of LED OFF - Amber ON – Green ON – LED OFF with every press of the Engine start/stop button. Probable Trouble Area 1. Permanent short of output of accessory relay. 2. Accessory relay feedback line between PEPS ecu pin- 15 and battery signal. Healing Condition IGN OFF  ON Table 169 :- B1649- 14 overview details Component Details:- 1. PEPS ECU. 2. Accessory relay Preliminary Checks:- 1. Check Battery Voltage (9V-16V) 2. Check ECU pins for oxidation, bending & damage.