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: 108 of 202 Trouble Shooting:- Is DTC B1F4B-23 is Present? Check for Blower Speed Up Request functionality. Check the Blower Speed Up Request functionality by pressing Speed Up button Is Blower Speed Up button stucked? Check and lubricate switch if still the Blower Speed Up button is stucked then replace control panel. Clear the DTC from the ECU memory. Turn Ignition OFF & ON. Check the Blower Speed Up Request functionality by pressing Speed Up button Stop Stop YES NO YES NO Turn ON Ignition. Connect the TML Diagnostic Tool. Check the status of DTC’s (Memorized/Current) Record the DTC & Clear DTC’s Turn Ignition OFF & ON Verify If DTC B1F4B – 23 is present
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