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: 119 of 202 B1F33-23:- Auto Request Button-Signal Stuck Low Overview:- ISO Code B1F33– 23 Customer Symptom Auto request cannot be manually selected Fault Effects (On Vehicle) The Auto switch is stuck and Auto is deactivated also Auto LED status is not changing Lamp Status (If Any) if AUTO button is stuck in AUTO mode and AUTO Key Jam is detected, then control algorithm shall run in manual modes as per the user interventions. If Key Jam(Stuck) is cleared, AUTO will be activated with single AUTO key press. Fault Detection Condition Auto Request Button -Signal Stuck Low Normal Operating Condition When the Auto button is pressed. CCM shall take the input from different sensors and maintain the user temperature. Probable Trouble Area Auto switch component failure. Healing Condition Check and lubricate switch, replace control panel Component Details: Auto switch Button is shown in above image. The user shall be able to activate fully automatic temperature control when the Auto request button on CCH is pressed. 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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