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: 129 of 202 Trouble Shooting:- Is DTC B1F38 -23 is Present? Check for Rear Defog Request Button functionality. Check the Rear Defog Request shall be change by pressing Rear Defog button Is Rear Defog button stucked? Check and lubricate switch if still the Rear Defog button is stucked then replace control panel. Clear the DTC from the ECU memory. Turn Ignition OFF & ON. Check the Rear Defog Request shall be change by pressing Rear Defog 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 B1F38 – 23 is present
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