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: 53 of 202 B1F2F-12:- Blower Motor Drive Signal - Circuit Short to battery; ISO Code B1F2F - 12 Customer Symptom Blower noise and annoyance Fault Effects (On Vehicle) Blower will be Off. Hence no heating or cooling will be achieved Lamp Status (If Any) AC will be switched Off Blower will be turned OFF Fault Detection Condition Blower Control Circuit Motor line- Circuit short to Battery Normal Operating Condition With the Blower control circuit connected to the harness and with Ignition ON, check the voltage between pin no 24 of blue connector & ground of the Connector. The voltage range should be in between 1.73 to 8.71 V. Probable Trouble Area Drive line is short circuited to battery Healing Condition If there is a continuity between the Blower control circuit & battery line correct the wiring harness (wiring harness short to battery) Component Details: The blower is used for moving air from either an outside source--referred to as vented air--or from cabin air past the heater core or air conditioning evaporator. In doing so, it causes a heat transfer either to the inside of the car or from the inside to the outside. Preliminary Checks: Switch On the IGN & perform the following check. 1) Connect the Diagnostics tool & check the DTC fault code 2) Read ECU parameter value Blower Speed Output (Internal Value) for Blower speed with the diagnostic tool
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