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Q5/X451 FATC
DTC Troubleshooting Data
Version: 1.0
Date: 16-Oct-2018
Copyright ©
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.
Author: ERC
Page: 151 of 202
B1F48-12:-
All HVAC & non-HVAC sensors Voltage reference pin- Circuit Short to battery
ISO Code
B1F48- 14
Customer Symptom
System is less responsive to user control and
environmental conditions
Fault Effects (On Vehicle)
Non HVAC sensor input out of range
Lamp Status (If Any)
Door flaps shall be timer controlled
Fault Detection Condition
If C2 - 14 of HVAC side connector to battery
Normal Operating Condition
FATC setting is updating properly as per user input.
Probable Trouble Area
HVAC connector wired wrong,
Sensor connector wired wrong,
harness wire shorted
Healing Condition
If there is a continuity between the C2-14 of HVAC side
connector and battery line correct the wiring harness
(wiring harness short to battery)
Component Details:
N/A
Preliminary Checks:
1.
Voltage at the battery terminals should be greater than 9V at the Ignition ON Condition.
2.
FATC power supply connector should have greater than 9V for normal functionality of FATC.
3.
Check battery cable and FATC connector terminals for damage.
4.
Check CCM for pin bend/damage.