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: 110 of 202 B1F4C-23:- Blower Speed Down Request Button- Signal Stuck Low; Overview:- ISO Code B1F4C – 23 Customer Symptom Blower Speed down Request cannot be manually selected Fault Effects (On Vehicle) Blower Speed down switch is stuck and blower speed will be stuck at one speed. Lamp Status (If Any) Blower with default speed i.e- Speed 2. Fault Detection Condition Blower Speed down Request Button-Signal Stuck Low Normal Operating Condition Blower speed can be decrease by pressing blower speed down button. Probable Trouble Area Mode switch component failure. Healing Condition Check and lubricate switch, replace control panel Component Details: Blower Speed down Request Button is shown in above image. This button used to decrease the blower speed. 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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