Overview
The Dual Automatic Temperature Control (DATC) system maintains the selected vehicle interior temperature by heating and/or cooling the air depending on the HVAC control panel selection.
- The driver may override the automatic mode of operation.
- The temperature control setting is the desired cabin air temperature.
- The blower motor control override buttons vary the blower motor speed.
- The driver side and passenger side temperature settings can be individually controlled.
- During A/C operation, the system reduces the relative humidity of the air inside the vehicle.
HEV is equipped with an Exhaust Manifold and Catalytic Converter Assembly with coolant passages to heat engine coolant more rapidly, speeding up passenger compartment heating in cold temperatures.
Controls and Compressor Operation
Climate control commands are input through the HVAC control module. On vehicles equipped with Sony® Sound inputs can also be commanded through voice commands or the touch screen.
When the A/C is requested, the HVAC control module sends the message over the MS-CAN to the GWM . The GWM then forwards the message over the HEV High Speed Controller Area Network (HS-CAN).
The A/C demand message is sent from the SOBDMC over the HEV High Speed Controller Area Network (HS-CAN) to the ACCM . The ACCM engages the A/C electric compressor when all of the following conditions are met
- The PCM does not detect excessively high or low refrigerant pressure from the A/C pressure transducer.
- The PCM does not detect an ambient air temperature below approximately 35.6°F (2°C).
- The BCM does not detect an evaporator discharge air temperature below approximately 35.6°F (2°C).
The ACCM engages the A/C electric compressor when it receives the A/C demand message and target Revolutions Per Minute (RPM) request. Instead of cycling on and off like a traditional A/C compressor, the ACCM raises or lowers the A/C electric compressor speed as required.
The HVAC control module adjusts the air inlet door depending on the humidity measured by the in-vehicle temperature and humidity sensor. If the vehicle cabin becomes too humid and recirculated air is selected, the HVAC control module adjusts the air inlet door to allow more fresh air. When the humidity level drops, it may adjust back to partial recirculated air. The HVAC control module also adjusts the system based on in-vehicle temperature.
The sunload sensor supplies information to the HVAC control module indicating the intensity of the sun on the vehicle. The HVAC control module adjusts the system based on the intensity.
Normal operation and Fault Conditions
The A/C pressure transducer receives a ground from the PCM . A 5-volt reference voltage is supplied to the A/C pressure transducer from the PCM . The A/C pressure transducer then sends a voltage to the PCM to indicate the A/C pressure.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0532 | A/C Refrigerant Pressure Sensor "A" Circuit Low | The A/C pressure transducer inputs a feedback voltage to the PCM . This DTC sets if the feedback voltage is less than 0.26 volts for at least 2 seconds and the ambient air temperature is greater than 0°C (32°F). |
| P0533 | A/C Refrigerant Pressure Sensor "A" Circuit High | The A/C pressure transducer inputs a feedback voltage to the PCM . This DTC sets if the feedback voltage is greater than 4.95 volts for at least 2 seconds and the ambient air temperature is greater than 0°C (32°F). |
DTC FAULT TRIGGER CONDITIONS
The ACCM requires an operating voltage between 9 and 16 volts. The ACCM receives this voltage from the BJB . The ACCM has a single ground circuit located in the engine compartment wiring harness.
Excessive resistance or an open in one or more of these circuits, a discharged battery or an inoperative charging system results in the ACCM setting a DTC .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0562:00 | System Voltage Low: No Sub Type Information | If the ACCM detects low voltage system voltage drops below 8.5 volts, this DTC sets after 5 seconds and the A/C electric compressor motor is stopped. |
DTC FAULT TRIGGER CONDITIONS
Control System Logic
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0140:00 | Lost Communication With Body Control Module: No Sub-Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets in the HVAC control module if data messages received from the BCM over the Medium Speed Controller Area Network (MS-CAN) are missing for 5 seconds or more. |
DTC FAULT TRIGGER CONDITIONS
Control System Logic
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0140:00 | Lost Communication With Body Control Module: No Sub-Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets in the ACCM if data messages received from the BCM over the High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or more. |
DTC FAULT TRIGGER CONDITIONS
System Operation
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
Actuator - Air Inlet Door
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
During an actuator calibration cycle, the HVAC control module drives the air inlet door until the door reaches both internal stops in the HVAC case. If the air inlet mode door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the air intake may not be from the expected source.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1083:00 | Recirculation Damper Motor: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) and on-demand DTC sets when the HVAC control module senses no changes in door actuator circuit when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
During an actuator calibration cycle, the HVAC control module drives the defrost vent/register door or the footwell vent door until the door reaches the internal stops in the HVAC case. If either mode door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be from the expected outlets.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1085:00 | Defroster Damper Motor: No Sub Type | Information This Continuous Memory Diagnostic Trouble Code (CMDTC) and on-demand DTC sets when the HVAC control module senses no changes in the feedback circuit when motor movement is commanded and no motor electrical Diagnostic Trouble Codes (DTCs) are present. |
| B1086:00 | Air Distribution Damper Motor: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) and on-demand DTC sets when the HVAC control module senses no changes in the feedback circuit when motor movement is commanded and no motor electrical Diagnostic Trouble Codes (DTCs) are present. |
DTC FAULT TRIGGER CONDITIONS
When the engine is at operating temperature hot coolant flows from the electric motor through the heater core and back to the electric motor. Correct coolant temperatures are critical for good heater performance.
Control System Logic
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
Controls and Compressor
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
A/C pressure transducer
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
Evaporator Temperature Sensor
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B11EE:19 | A/C Compressor: Circuit Current Above Threshold | This DTC sets when the ACCM detects excessive voltage on the low voltage circuit. |
| B11EE:92 | A/C Compressor: Performance or Incorrect Operation | This DTC sets when the ACCM detects the number of stops due to "software overcurrent" or "start failure" exceeds a specified value. |
DTC FAULT TRIGGER CONDITIONS
Control System Logic
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
Controls and Compressor Operation
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
A/C pressure transducer
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
Evaporator Temperature Sensor
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
Temperature Door Actuator - Driver Side
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
During an actuator calibration cycle, the HVAC control module drives the temperature door until the door reaches both internal stops in the HVAC case. If the temperature door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1081:00 | Left Temperature Damper Motor: No Sub Type Information | This DTC sets when the HVAC control module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
Temperature Door Actuator - Passenger Side
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
During an actuator calibration cycle, the HVAC control module drives the temperature door until the door reaches both internal stops in the HVAC case. If the temperature door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1082:00 | Right Temperature Damper Motor: No Sub Type Information | This DTC sets when the HVAC control module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
Voltage is supplied to the blower motor relay from the BJB . When the blower motor relay coil receives a ground from the BCM , the relay coil is energized and voltage is delivered to the blower motor speed control module. Voltage and ground for the blower motor is provided by the blower motor speed control. The HVAC control module sends a PWM signal to the blower motor speed control to control the blower speed.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:12 | Blower Fan Relay: Circuit Short To Battery | This DTC sets in continuous memory when the BCM senses voltage on the relay coil ground circuit when the module is grounding the circuit. |
| B10AF:13 | Blower Fan Relay: Circuit Open | This DTC sets in continuous memory when the BCM senses no voltage on the relay coil ground circuit when the module is grounding the circuit. |
| B10AF:14 | Blower Fan Relay: Circuit Short To Ground or Open | This DTC sets in continuous memory when the BCM senses no voltage on the relay coil ground circuit when the module is grounding the circuit. |
| B10AF:19 | Blower Fan Relay: Circuit Current Above Threshold | This DTC sets in continuous memory when the BCM senses excessive voltage on the relay coil ground circuit when the module is grounding the circuit. |
DTC FAULT TRIGGER CONDITIONS
Voltage is supplied to the blower motor relay from the BJB . When the blower motor relay coil receives a ground from the BCM , the relay coil is energized and voltage is delivered to the blower motor control module and ground for the blower motor is provided by the blower motor speed control. The HVAC control module sends a PWM signal to the blower motor speed control to control the blower speed.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:11 | Blower Fan Relay: Circuit Short To Ground | This DTC sets when the BCM senses a ground on the blower motor relay coil control circuit when the relay is not grounded by the module. |
| B10B9:00 | Blower Control: No Sub Type Information | This DTC sets when the HVAC control module senses incorrect voltage on the blower motor control PWM circuit. |
DTC FAULT TRIGGER CONDITIONS
The 4 air discharge temperature sensors contain a thermistor. The sensor varies its resistance with the temperature. As the temperature rises, the resistance falls. As the temperature falls, the resistance rises.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10B3:00 | Right Panel Air Discharge Temperature: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the right panel air discharge temperature sensor. |
| B10B4:00 | Right Floor Air Discharge Temperature: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the right floor air discharge temperature sensor. |
| B10B5:00 | Left Panel Air Discharge Temperature: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the left panel air discharge temperature sensor. |
| B10B6:00 | Left Floor Air Discharge Temperature: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the left floor air discharge temperature sensor. |
DTC FAULT TRIGGER CONDITIONS
In-Vehicle Temperature and Humidity Sensor
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B105A:00 | Cabin Temperature Sensor Fan: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses no voltage or unexpected voltage on the circuit for the cabin temperature sensor fan. |
| B1A61:00 | Cabin Temperature Sensor: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the cabin temperature sensor. |
| B1A69:00 | Humidity Sensor: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses erratic voltages from the humidity sensor. |
DTC FAULT TRIGGER CONDITIONS
Sunload Sensor
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1A63:00 | Right Solar Sensor: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses lower than expected voltage on an open, short to voltage or short to ground from the light sensor input circuit. |
| B1A64:00 | Left Solar Sensor: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses an open, short to voltage or short to ground from the light sensor input circuit. |
DTC FAULT TRIGGER CONDITIONS
The HVAC control module requires an operating voltage between 9 and 16 volts. The HVAC control module receives this voltage from the BJB. The HVAC control module has a single ground circuit located in the engine compartment wiring harness. Excessive resistance or an open in one or more of these circuits, a discharged battery or an inoperative charging system results in the HVAC control module setting a DTC .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U3006:16 | Control Module Input Power "A": Circuit Voltage Below Threshold | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses lower than expected voltage. |
| U3006:17 | Control Module Input Power "A": Circuit Voltage Above Threshold | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses greater than expected voltage. |
DTC FAULT TRIGGER CONDITIONS
Control System Logic
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0155:00 | Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets in the HVAC control module if data messages received from the IPC over the Controller Area Network (CAN) are missing for 5 seconds or more. |
DTC FAULT TRIGGER CONDITIONS
Evaporator Temperature Sensor
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1B71:21 | Evaporator Temperature Sensor: Signal Amplitude < Minimum | This DTC sets when the BCM senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground. |
| B1B71:22 | Evaporator Temperature Sensor: Signal Amplitude > Maximum | This DTC sets when the BCM senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor. |
| B1B71:2F | Evaporator Temperature Sensor: Signal Erratic | This DTC sets when the BCM senses erratic voltages from the evaporator temperature sensor. |
DTC FAULT TRIGGER CONDITIONS
Control System Logic
REFER to: CLIMATE CONTROL SYSTEM - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0293:00 | Lost Communication With Hybrid/EV Powertrain Control Module: No Sub Type Information | This DTC sets in the ACCM if data messages received from the SOBDMC over the High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or more. |
DTC FAULT TRIGGER CONDITIONS
HEV is equipped with an exhaust manifold and catalytic converter assembly with coolant passages. It is used to heat engine coolant more rapidly, speeding up passenger compartment heating. This system includes an ECT sensor 2 (also known as cabin heater coolant temperature sensor) on the coolant tube that is hardwired to the PCM . When low, high or erratic voltage is sensed by the PCM on the ECT sensor 2 circuit, a DTC is set.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P2184 | Engine Coolant Temperature Sensor 2 Circuit Low | This DTC sets when the PCM senses low voltage on the ECT sensor 2 circuit, indicating a short to ground. |
| P2185 | Engine Coolant Temperature Sensor 2 Circuit High | This DTC sets when the PCM senses high voltage on the ECT sensor 2 circuit, indicating a short to voltage. |
| P2186 | Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic | This DTC sets when the PCM senses erratic voltage on the ECT sensor 2 circuit, indicating an intermittent connection or a short to ground or voltage. |
DTC FAULT TRIGGER CONDITIONS