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: 128 of 202 B1F38-23:- Rear Defog Request Button -Signal Stuck Low Overview:- ISO Code B1F38 – 23 Customer Symptom Rear Defog Request Button cannot be manually selected Fault Effects (On Vehicle) The Rear Defog switch is stuck and unable to ON/OFF rear defog heater grids Lamp Status (If Any) If Rear Defog function was active prior to key jam detection, then the rear defog request to BCM will continue to transmitted as ON until BCM timeouts the rear defog function If Key Jam(Stuck) is cleared, Rear Defog can be activated/deactivated along with supporting conditions with the rear defog key press. Fault Detection Condition Rear Defog Request Button -Signal Stuck Low Normal Operating Condition Rear Defog push button shall be used to manually switch ON/OFF the rear defog heater grids on the rear window. Probable Trouble Area Mode switch component failure. Healing Condition Check and lubricate switch, replace control panel Component Details: Rear Defog switch Button is shown in above image. The user shall be used to manually switch ON/OFF the rear defog heater grids on the rear window. 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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