NEXON 3.0 EV DTC Troubleshooting Document for VCU Version: 2.0 Date: 22-Sep-2023 Copyright © TATA MOTORS Ltd. This document must not be used in anyway, such as copying and redistributing to third parties, without the consent of author. U0164 - 08: - Lost Communication with Heating Ventilation and Air-Conditioning (HVAC) module - Bus Signal / Message Failures Overview: ISO Code U0164-08 Customer Symptom AC and heater function is affected Fault Effects (On Vehicle) AC and heater function is affected Lamp Status (If Any) No Indicator Fault Detection Condition HVAC CAN messages are not received at VECU Normal Operating Condition HVAC CAN message is received at VECU for vehicle operation Probable Trouble Area LV wiring Harness HVAC fuse Healing Condition Ignition OFF wait till VCU sleeps & Ignition ON Component Details: HVAC ECU is responsible to regulate the operation of a heating and/or air conditioning system Preliminary Checks: 1. Check for proper terminal connection of 12V LV Battery 2. Check LV Battery voltage to be in range (7.5V - 14V) 3. Check LV Supply Connection of HVAC for damage (connectors, terminals bending & rusting of pins) 4. Check for loose connection of LV wiring harness between HVAC and VCU 5. Check for damage to LV wiring harness connections between HVAC and VCU Trouble Shooting: - Check for the ABS ECU supply pin and ignition pin connection from LV battery to ECU. (Refer schematic for details) Check for the LV wiring harness connection between VCU and ABS ECU on Vehicle CAN network as per the details given in LV schematic. Step no. Description Check Point if YES if NO
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