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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: 100 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.
C0040 – 12: Brake Pedal Switch - Circuit short to Battery
Overview:
ISO Code (DTC Code)
C0040 - 12
Customer Symptom
1. Brake lamps always ON
Fault Effects (On Vehicle)
1. Brake lamps always ON
2. Battery Drain
Lamp Status (If Any)
Always ON
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 Brake lamp
selection 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 Fault
2. Cockpit harness Short to battery
3. Switch damaged or stuck
4. BCM ECU fault
5. Brake selection switch side connector fault.
Healing Condition
1. Ignition OFF
ON
2. Clear DTC Command
Component Details:
Brake Pedal Switch is operate manually. If the IGN is KeyIN/ Accessory/Keyout/ON/Run and user presses the
Brake, Brake lamps will be turned ON.
Preliminary Checks:
1. Check Battery Voltage (9V-16V)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-