Symptom Chart - Climate Control Systems

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SYMPTOM CHART - CLIMATE CONTROL SYSTEMS

Condition	Possible Sources	Action
No communication with the Traction Battery Control Module (TBCM)	Circuitry TBCM	REFER to HIGH VOLTAGE TRACTION BATTERY .
The air conditioning (A/C) is inoperative/does not operate correctly	Fuse(s) Circuitry open A/C system discharged/low charge PCM HVAC module A/C clutch relay A/C low charge protection switch Dual-function pressure switch A/C compressor clutch air gap A/C clutch field coil	GO to PINPOINT TEST F .
The air conditioning (A/C) is always on - A/C compressor does not cycle	Circuitry shorted PCM A/C clutch relay A/C compressor clutch air gap	GO to PINPOINT TEST G .
The air conditioning (A/C) is always on - A/C mode always commanded ON	Circuitry shorted PCM HVAC module A/C low charge protection switch	GO to PINPOINT TEST H .
The air inlet door is inoperative	Circuitry open/shorted Air inlet door actuator Air inlet door/linkage damaged, binding or stuck HVAC module	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
Incorrect/erratic direction of airflow from outlets	Circuitry open/shorted Mode door actuator Mode door/linkage damaged, binding or stuck HVAC module	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
The HVAC system is inoperative, intermittent or incorrect operation	Fuse(s) Circuitry open HVAC module	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
Insufficient, erratic or no heat	Low engine coolant level Plugged or partially plugged heater core Temperature blend door/actuator	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
Temperature control is inoperative/does not operate correctly	Circuitry open/shorted HVAC module Temperature blend door is binding or stuck Temperature blend door actuator	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
The blower motor is inoperative - EATC	Fuse(s) Circuitry short/open Blower motor relay Blower motor Blower motor speed control module HVAC module	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
The blower motor does not operate correctly - EATC	Circuitry open/shorted Blower motor speed control module HVAC module	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
The dual temperature control is inoperative/does not operate correctly	Temperature blend door/actuator broken/binding HVAC module Low A/C refrigerant charge	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .
The temperature set point does not repeat after turning the ignition switch OFF	Fuse Circuitry short/open HVAC module	VERIFY Smart Junction Box (SJB) fuse 15 (10A) is OK. If OK, CHECK circuit SBP15 (WH/RD) for a short or open and REPAIR as necessary. TEST the system for normal operation. If OK, INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
The temperature display will not switch between Celsius and Fahrenheit	HVAC module Instrument Cluster (IC) module	If the IC does not switch between English and Metric, REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION and diagnose. If only the HVAC module does not switch between English and Metric, INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
Inaccurate external temperature display	HVAC module Ambient temperature sensor	REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS .