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: 125 of 202 B1F37-23:- Max. Defrost Request Button-Signal Stuck Low Overview:- ISO Code B1F37– 23 Customer Symptom Max. Defrost Request Button cannot be manually selected Fault Effects (On Vehicle) Max. Defrost Request switch is stuck and air distribution mode is not changing to defrost mode Lamp Status (If Any) If panel was in Max Defrost state prior to Key jam detection, then the panel will continue to remain in Max defrost state until any user interventions. To change the air-distribution settings, user can press the manual mode setting button. If Key Jam(Stuck) is cleared, Max Defrost will be activated with single Max Defrost key press. Fault Detection Condition Max. Defrost Request Button -Signal Stuck Low Normal Operating Condition Max Front Defrost Request push button shall be used to manually switch the air distribution to defrost mode and clearing/defogging the front windshield Probable Trouble Area Max defrost switch component failure. Healing Condition Check and lubricate switch, replace control panel Component Details: Max Front Defrost switch Button is shown in above image. Max Front Defrost Request push button shall be used to manually switch the air distribution to defrost mode Preliminary Checks: Switch On the IGN & perform the following check. 1) Connect the Diagnostics tool & check the DTC fault code 2) If the fault code exists, refer the corrective actions
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