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Vehicle Platform: NEXON
ECU Name: ESCL
DTC Troubleshooting Data
Version: 1.4
Date: 09 Jan 2018
Author: Hitesh Kaneria
Page: 59 of 88
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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.
B1023–12: ESCL motor driver high side circuit - short to battery
Overview:
ISO Code (DTC Code)
B1023-12
Customer Symptom
ESCL unable to lock steering wheel.
Fault Effects (On Vehicle)
ESCL unable to lock steering wheel.
Lamp Status (If Any)
NA
Fault Detection Condition
This fault gets log when ESCL motor high side driver circuit is
short to battery.
Normal Operating Condition
This fault B1023-12 shall not log during ESCL locking and
unlocking.
Probable Trouble Area
ESCL internal hardware failure.
Healing Condition
ESCL ECU replacement
Table 20: B1023-12 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 messages 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.