1983 / 4910
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: 640 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.
B2256- 12: Wiper High/Low Relay Short to BATT
Overview:
ISO Code (DTC Code)
B2256- 12
Customer Symptom
Front Wiper will always operate in Low speed mode
when user request Wiper LOW/ HIGH through combi
switch.
Fault Effects (On Vehicle)
1.
Front Wiper will always operate in low speed
mode when requested.
Lamp Status (If Any)
NA
Fault Detection Condition
This fault will logged with IGN ON and wiper switch ON
is requested.
Normal Operating Condition
IGN ON and No DTC logged. Front wiper operated in low
speed and high speed as per switch request.
Probable Trouble Area
1. BCM connector Fault.
2. Front harness Short to Ground.
3. Relay fault.
4.
ECU fault.
Healing Condition
1.
Switch request after fault removal
2.
Clear DTC command- No DTC logged
Component Details:
BCM drives the wiper motor in Low/ High speed through this relay(speed selection) by providing GND to the relay coil.
Hence in case this output is shorted to BATT the relay will be continuously OFF(If the relay is OFF, it will drive the wiper
motor in SLOW speed when wiper is ON). Hence whenever User will switch ON the wiper, the wiper motor will switch ON
in slow speed mode.
Preliminary Checks:
1. Check Battery Voltage (9V-16V)
2. Check ECU pins for oxidation, bending & damage.
Trouble Shooting:-