Vehicle Platform: NEXON ECU Name: ESCL DTC Troubleshooting Data Version: 1.4 Date: 09 Jan 2018 Author: Hitesh Kaneria Page: 67 of 88 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. B1027–09: System basis chip error – component failure Overview: ISO Code (DTC Code) B1027-09 Customer Symptom ESCL unable to lock and unlock the steering wheel. Fault Effects (On Vehicle) ESCL unable to lock and unlock the steering wheel. Lamp Status (If Any) NA Fault Detection Condition This fault gets log when ESCL internal hardware component (micro switch) failure. Normal Operating Condition This Fault shall not log during ESCL locking, unlocking. Probable Trouble Area ESCL hardware failure Healing Condition ESCL ECU replacement Table 24: B1027-09 overview details Component Details: ESCL ECU is located on steering column behind steering wheel. ESCL ECU locks and unlocks the steering wheel based on CAN message received from PEPS, EMS, ABS and BCM. Preliminary Checks: 1. Check Battery Voltage (9V-16V). 2. Check EMS, PEPS, BCM and ABS ECU’s signals are available on CAN bus by confirming that ABS, EMS, BCM and PEPS related DTCs are not available in ESCL. Troubleshooting: Start Stop 1. Keep vehicle in static condition. 2. Turn ignition ON -> OFF Replace ESCL ECU Note: Refer ESCL ECU replacement procedure doc to replace ESCL ECU. DTC’s confirmation: After rectification, ensure the following points by using TML diagnostic tool before handling over to customer. 1. Switch IGN ON -> OFF. 2. Press Lock button on UID or Driver door close to open for ESCL locking trigger. 3. Press unlock button on UID. 4. Switch IGN OFF->ON and read DTC. ESCL shall not log B1027-09.
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