HARRIER BOOK 2

Vehicle Platform: OSPREY / AMP

ECU Name: PEPS

DTC Troubleshooting Data

Version: 1.2

Date: 29 Mar 2017

Author:

Rajasekhara Reddy

Page: 81 of 369

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)

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.