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: 107 of 202 B1F4B-23:- Blower Speed Up Request Button-Signal Stuck Low Overview:- ISO Code B1F4B – 23 Customer Symptom Blower Speed Up Request cannot be manually selected Fault Effects (On Vehicle) Blower Speed Up 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 Up Request Button-Signal Stuck Low Normal Operating Condition Blower speed can be increase by pressing blower speed up button. Probable Trouble Area Mode switch component failure. Healing Condition Check and lubricate switch, replace control panel Component Details: Blower Speed Up Request Button is shown in above image. This button used to increase 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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