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: 8 of 202 B1F1B-15:- Solar Radiation Sensor Circuit - Circuit short to battery or open; ISO Code B1F1B- 15 Customer Symptom System operates but with reduced sensitivity to conditions Fault Effects (On Vehicle) Solar load cannot be evaluated and solar compensation will not be possible Lamp Status (If Any) No solar load is considered Fault Detection Condition Solar Radiation Sensor - Circuit short to battery or open Normal Operating Condition With the sensor connected to the harness and with Ignition ON, check the voltage between pin no 1 & 2 of the sensor. The voltage range should be in between 4.057 to 1.334 V Probable Trouble Area 1) Sensor connector is not connected firmly 2) Sensor signal short to Battery 3) No continuity between FATC ECU to Sensor Healing Condition 1) If the values seen on the diagnostics tool in read ECU parameters is not getting updated then replace the sensor 2) If there is a continuity between the sensor signal and battery line correct the wiring harness (wiring harness short to battery). Component Details: Solar sensors sends the voltage to control unit according to the intensity of sunlight. Stronger the incident sunlight, higher the voltage. Preliminary Checks: Switch On the IGN & perform the following check. 1) Connect the Diagnostics tool & check the DTC fault code 2) Read ECU parameter for solar sensor Solar Load Status. Drive the vehicle in sun & check the parameter is changing or not. 3) Cover the solar sensor and check if the parameter value is changing.
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