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Vehicle Platform: Tiago,Tigor & Osprey
ECU Name: Hella Body Control Module (BCM)
DTC Troubleshooting Data
Version: 2.0
Date: 22-10-2018
Author: Parag K
Page: 77 of 737
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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.
U100A - 16:- Control Module Input Power 3 - circuit voltage below threshold
Overview:
ISO Code
U100A - 16
Customer Symptom
BCM will probably not function or will function intermittently or
partially
Fault Effects (On Vehicle)
Cannot determine scope without knowledge of power line
applicability
Lamp Status (If Any)
None
Fault Detection Condition
If Battery(supply) voltage goes below 11.5V
If Alternator is not charging the battery and alternator voltage
is less than 13.5V or 0V.
Normal Operating Condition
Normal operating range:
ECU will be awake from 6V to 16 V.
Full assistance is b/w 11.5 to 16 volts.
Reduced assistance is b/w 9 to 11.5 V
Probable Trouble Area
Low battery
Healing Condition
N/A
Component Details:
N/A
Preliminary Checks:
1. Voltage at the battery terminals should be greater than 11.5V.
2. BCM power supply connector should have greater than 11.5V for full assistance.
3. Check battery cable and BCM connector terminals for damage.
4. Check BCM ECU for pin bend/damage.
5. Alternator output voltage should be between 13.5 V to 14.5 V in engine running condition.