{Osprey CCM} DTC Troubleshooting Data Version: 2.0 Date: 28-Jul-17 Author: ERC Page: 55 of 244 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. B1F28-12:- Blower Motor Diagnostic Feedback OR Blower Motor DTC - Circuit Short to Battery;: ISO Code B1F28- 12 Customer Symptom No cooling Fault Effects (On Vehicle) Blower current status cannot be evaluated Blower will be OFF Lamp Status (If Any) NA Fault Detection Condition Blower Control Circuit feedback 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 blue connector pin no 27 & ground of the Connector. The voltage range should be in between 0.33 to 7.65 V Probable Trouble Area Feedback line is short circuited to battery Healing Condition NA 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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