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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: 410 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.
U100F - 12: Ignition Power mode Input - Circuit Short to Battery
Overview:
ISO Code (DTC Code)
U100F - 12
Customer Symptom
Active power mode may operate when in Accessory or
battery-only power mode
Fault Effects (On Vehicle)
1. Active power mode may operate when in Accessory
or battery-only power mode
2. Battery Drain
Lamp Status (If Any)
NA
Fault Detection Condition
This fault will be logged after the input switch test routine
execution. User has to operate the switch manually during
routine. If short to battery fault is detected for ignition power
mode input switch then this DTC code will be returned with
the Routine results.
Normal Operating Condition
There should not be any fault returned by routine.
Probable Trouble Area
1. BCM connector wired wrong
2. Cockpit wiring harness short to battery
3. switch damaged
4. Ignition switch failure
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
Ignition power mode input switch is part of Ignition switch and interfaced to the BCM. If the Ignition power mode
input switch is activated and all functionality will work properly and if user put the ignition switch to ignition power
mode input position, all functionality will work.
Ignition power mode input switch is active high.
Preliminary Checks:
1. Check Battery Voltage (9V-16V)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-