Vehicle Platform: OSPREY / AMP ECU Name: PEPS DTC Troubleshooting Data Version: 1.2 Date: 29 Mar 2017 Author: Rajasekhara Reddy Page: 81 of 369 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 - 12:- ACC Relay Feedback - circuit short to battery Overview:- ISO Code (DTC Code) B1649 – 12 Customer Symptom Amber color LED continuously ON in IGN OFF mode. Fault Effects (On Vehicle) Amber color LED continuously ON in IGN OFF mode. 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 ON OFF Table 18:- B1649- 12 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.
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