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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: 418 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.
U1000 - 12: Accessory Power mode Input - Circuit Short to Battery
Overview:
ISO Code (DTC Code)
U1000 - 12
Customer Symptom
Accessory power mode may operate and head lamps may
operate when in battery-only power mode
Fault Effects (On Vehicle)
1. Accessory power mode may operate and head lamps
may operate when in 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 ground
3. switch damaged
4. Ignition switch failure
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
Accessory power mode input switch is part of Ignition switch and interfaced to the BCM. If the Accessory power
mode input switch is activated and head lamps and power windows functionality will work properly. If user put the
ignition switch to Accessory power mode input position, head lamps and power windows functionality will work.
Accessory 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:-