Automatic Climate Control, Acc: Other Saab 9-5 II

Radio/HVAC Control

The Radio/HVAC control contains all switches, which are required to control the functions of HVAC and serve as interface between the operator and the HVAC control module. The selected values are passed to the HVAC control module via LIN-Bus.

Radio/HVAC Control - Auxiliary (only CJ4)

The Radio/HVAC control - auxiliary contains all switches, which are required to control the functions of rear HVAC and serve as interface between the operator and the HVAC control module. The selected values are passed to the HVAC control module via LIN-Bus.

HVAC Control Module

The HVAC control module is a GMLAN device that interfaces between the operator and the HVAC system to maintain and control desired air temperature and air distribution settings. The battery positive voltage circuit provides power that the HVAC control module uses for keep alive memory. If the battery positive voltage circuit loses power, all HVAC DTCs and settings will be erased from keep alive memory. The body control module (BCM), which is the vehicle mode master, provides a device ON-Signal. The HVAC control module provides blower, air delivery mode and air temperature settings.

The HVAC control module supports the following features

Mode Actuator (Front and Rear)

The mode actuator is a 5-wire stepper motor. The HVAC control module supplies a 12 V reference voltage to the stepper motor and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motor puts the mode flap into the calculated position in order to reach the selected position. The null point of the stepper motor will be calibrated, if the stepper motor is new. When the stepper motor is calibrated, the HVAC control module can drive the applicable coil to reach exactly the desired position of the flap.

Air Temperature Actuators (Front)

The interior temperature can be selected separately for the driver and passenger. For this purpose, two stepper motors are used that regulates two mixed air flaps independently of each other. The air temperature actuators are 5-wire stepper motors. The HVAC control module supplies a 12 V reference voltage to each stepper motor and energizes the 4 stepper motor coils with a pulsed ground signal. The left air temperature actuator moves the left mixed air flap into the calculated position, in order to reach the selected temperature of the left temperature switch. The right air temperature actuator puts the right mixed air flap into the calculated position, in order to reach the selected temperature of the right temperature switch. The null point of the stepper motor will be calibrated, if the stepper motor is new. When the stepper motor is calibrated, the HVAC control module can drive the applicable coil to reach exactly the desired position of the flap.

Air Temperature Actuator (Rear)

The interior temperature can be selected separately for the rear passengers. The air temperature door actuator - auxiliary is a 5-wire stepper motor. The HVAC control module supplies a 12 V reference voltage to the stepper motor and energizes the 4 stepper motor coils with a pulsed ground signal. The air temperature door actuator - auxiliary moves the rear mixed air flap into the calculated position, in order to reach the selected temperature of the rear temperature switches. The null point of the stepper motor will be calibrated, if the stepper motor is new. When the stepper motor is calibrated, the HVAC control module can drive the applicable coil to reach exactly the desired position of the flap.

Recirculation Actuator

The recirculation actuator is a 5-wire stepper motor. The HVAC control module supplies a 12 V reference voltage to the stepper motor and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motor puts the recirculation flap into the calculated position in order to reach the desired position. The null point of the stepper motor will be calibrated, if the stepper motor is new. When the stepper motor is calibrated, the HVAC control module can drive the applicable coil to reach exactly the desired position of the flap.

Air Inlet Actuator

The air inlet actuator is a 5-wire stepper motor. The HVAC control module supplies a 12 V reference voltage to the stepper motor and energizes the 4 stepper motor coils with a pulsed ground signal. The stepper motor moves the air inlet flap into the calculated position, in order to reach the selected position. The null point of the stepper motor will be calibrated, if the stepper motor is new. When the stepper motor is calibrated, the HVAC control module can drive the applicable coil to reach exactly the desired position of the flap.

Blower Motor Control Processor (Front and Rear)

The blower motor control processor controls the speed of the blower motor by increasing or decreasing the voltage drop on the ground side of the blower motor. The HVAC control module provides a low side pulse width modulation (PWM) signal to the blower motor control processor via the blower motor speed control circuit. As the requested blower speed increases, the HVAC control module increases the amount of time that the speed signal is modulated to ground. As the requested blower speed decreases, the HVAC control module decreases the amount of time that the signal is modulated to ground.

Duct Temperature Sensors

The air temperature sensors are 2-wire negative temperature co-efficient thermistors. The sensors operate within a temperature range of -40 to +85°C (-40 to +185°F). The sensors are installed in the air distribution ducts and measure the temperature of the air that streams from the ducts. The HVAC control module uses these values to calculate the mixed air flap position.

Evaporator Temperature Sensor

The evaporator temperature sensor is a 2-wire negative temperature co-efficient thermistor. The sensor operates within a temperature range of -40 to +85°C (-40 to +185°F). The sensor is installed at the evaporator and measures its temperature. If the temperature drops under 2°C (36°F), the compressor will be switched off in order to prevent a frozen evaporator.

A/C refrigerant pressure sensor

The A/C refrigerant pressure sensor is a 3-wire piezoelectric pressure transducer. A 5 V reference voltage, low reference, and signal circuits enable the sensor to operate. The A/C pressure signal can be between 0.2-4.8 V. When the A/C refrigerant pressure is low, the signal value is near 0 V. When the A/C refrigerant pressure is high, the signal value is near 5 V. The engine control module (ECM) converts the voltage signal to a pressure value. When pressure is too high or too low, the ECM will not allow the A/C compressor clutch to engage.

A/C Compressor (only LLU)

The A/C compressor is belt driven and operates when the magnetic clutch is engaged. When the A/C switch is pressed, the HVAC control module sends an A/C request signal to the ECM via the CAN bus. The ECM then grounds the A/C compressor clutch relay control circuit, which energises the AC compressor clutch relay. Battery voltage is supplied via the relay contacts to the A/C compressor clutch which is then activated.

A/C Compressor (only LAU, LBR, LBS, LBY, LDK, LHU)

The A/C compressor is constantly belt driven. The performance of the A/C compressor is regulated per a lifting magnet in the A/C compressor. The HVAC control module supplies battery voltage to the A/C compressor. When the A/C switch is pressed, the HVAC control module provides a pulse width modulation (PWM) signal to the A/C compressor in order to command the performance of the A/C compressor. The performance of the A/C compressor is regulated according to adjusted interior temperature on the basis of characteristic lines. Therefore the HVAC control module grounds the A/C compressor with the PWM signal.

Windshield Temperature and Inside Moisture Sensor

The windshield temperature and inside moisture sensor includes the relative humidity sensor, windshield temperature sensor and humidity sensing element temperature sensor.

This sensor assembly provides information about

1. Relative humidity level at windshield (compartment side)
2. Temperature of the windshield inside (compartment side)
3. Temperature of the humidity sensor element

The relative humidity sensor measures the relative humidity of the compartment side of the windshield. It also detects the temperature of the windshield surface on the passenger compartment side. Both values are used as control inputs for the HVAC control module application to calculate the fog risk on windshield compartment side and ability to reduce fuel consumption by decreasing A/C compressor power to a minimum without causing any fog. The sensor will also enable partial recirculation mode in order to improve heat-up performance of the passenger compartment under cold ambient temperature conditions without the risk of mist build-up on the windshield. The humidity sensor element temperature sensor supplies the temperature of the humidity sensor element. It is only needed if the thermal contact between the humidity sensing element and the inside windshield surface is not sufficient.

Ambient Light/Sunload Sensor

The ambient light/sunload sensor includes the sunload sensor and passenger compartment temperature sensor.

This sensor assembly provides information about

1. Sun heat intensity
2. Elevation
3. Azimuth
4. Passenger compartment temperature

The sunload sensor is connected to ground and to a 12 V clocked power supply through the HVAC control module. This clocked power supply is to power the sensor electronics and to work as a clock generator to the sunload sensor micro controller. The sensor uses a pulse signal for data identification and transferring the sun intensity measurement. At each positive transition from the clocked supply input, the sunload sensor micro controller will shift channels enabling new intensity measurement on the signal output to the HVAC control module. The signal voltage varies between 0-4 V.

The passenger compartment temperature sensor is a negative temperature co-efficient thermistor. A signal and low reference circuit enables the sensor to operate. When the air temperature increases, the sensor resistance decreases. The sensor signal varies between 0-5 V.

Bright or high intensity light causes the vehicles interior temperature to increase. The HVAC system compensates for the increased temperature by diverting additional cool air into the vehicle.

Air Speed (Front)

The blower control switch is part of the Radio/HVAC control. The selected value of the blower switch position is sent to the HVAC control module via LIN-Bus.

The blower motor control module is an interface between the HVAC control module and the blower motor. The blower motor control module regulates supply voltage and ground circuits to blower motor. The HVAC control module provides a PWM signal to the blower motor control module in order to command the desired blower motor speed. The blower motor control module supplies battery voltage to the blower motor and uses the blower motor ground as a low side control to adjust the blower motor speed. The voltage amounts between 2-13 V and changes linear to the height of the PWM signal.

Air Speed (Rear)

The blower control switches are part of the Radio/HVAC control - auxiliary. The selected value of the rear blower switches position is sent to the HVAC control module via LIN-Bus.

The blower motor control module - auxiliary is an interface between the HVAC control module and the blower motor - auxiliary. The blower motor control module - auxiliary regulates supply voltage and ground circuits to blower motor - auxiliary. The HVAC control module provides a PWM signal to the blower motor control module - auxiliary in order to command the desired blower motor speed. The blower motor control module - auxiliary supplies battery voltage to the blower motor - auxiliary and uses the blower motor - auxiliary ground as a low side control to adjust the blower motor speed. The voltage amounts between 2-13 V and changes linear to the height of the PWM signal.

Air Delivery (Front)

The HVAC control module controls the distribution of air by the use of recirculation and mode door actuator. The modes that may be selected are

1. Defrost
2. Defog
3. Panel
4. Floor
5. Tri-Level
6. Bi-Level
7. Hi-Level

The desired air distribution mode can be selected with the air distribution switches at the Radio/HVAC control. The Radio/HVAC control delivers the values to the HVAC control module via LIN-Bus. The HVAC control module controls the mode door actuator so that it drives the flap to the calculated position. Depending on the position of the flap, air is distributed through various ducts leading to the outlets in the dash. Turning the mode flap to the defrost position, the HVAC control module will move the recirculation actuator to outside air, reducing window fogging. When defrost is selected, the blower motor will be activated, regardless of the coolant temperature. The HVAC control module enables a high volume of air delivered to the front defrost vents. A/C is available in all modes.

The rear window defogger does not affect the HVAC system.

Air Delivery (Rear)

The HVAC control module controls the distribution of air by the mode door actuator - auxiliary. The modes that may be selected are

1. AUTO
2. Floor
3. Bi-Level
4. Vent

The desired rear air distribution mode can be selected with the Mode switch at the Radio/HVAC control - auxiliary. The Radio/HVAC control - auxiliary delivers the values to the HVAC control module via LIN-Bus. The HVAC control module controls the mode door actuator - auxiliary so that it drives the flap to the calculated position. Depending on the position of the flap, air is distributed through various ducts.

Engine coolant

Engine coolant is the essential element of the heating system. The thermostat controls the normal engine operating coolant temperature. The thermostat also creates a restriction for the cooling system that promotes a positive coolant flow and helps prevent cavitation.

Coolant enters the heater core through the inlet heater hose, in a pressurized state. The heater core is located inside the HVAC control module. The ambient air drawn through the HVAC control module absorbs the heat of the coolant flowing through the heater core. Heated air is distributed to the passenger compartment, through the HVAC control module, for passenger comfort. Opening or closing the air temperature flap controls the amount of heat delivered to the passenger compartment. The coolant exits the heater core through the return heater hose and recirculates back to the engine cooling system.

A/C Cycle

Refrigerant is the key element in an air conditioning system. R-134a is presently the only Environmental Protection Agency approved refrigerant for automotive use. R-134a is a very low temperature gas that can transfer the undesirable heat and moisture from the passenger compartment to the outside air.

The compressor builds pressure on the vapor refrigerant. Compressing the refrigerant also adds heat to the refrigerant. The refrigerant is discharged from the compressor, through the discharge hose, and forced to flow to the condenser and then through the balance of the A/C system. The A/C system is mechanically protected with the use of a high pressure relief valve. If the A/C refrigerant pressure sensor fails or if the refrigerant system becomes restricted and refrigerant pressure continued to rise, the high pressure relief will pop open and release refrigerant from the system.

Compressed refrigerant enters the condenser in a high temperature, high pressure vapor state. As the refrigerant flows through the condenser, the heat of the refrigerant is transferred to the ambient air passing through the condenser. Cooling the refrigerant causes the refrigerant to condense and change from a vapor to a liquid state.

The condenser is located in front of the radiator for maximum heat transfer. The condenser is made of aluminum tubing and aluminum cooling fins, which allows rapid heat transfer for the refrigerant. The semi-cooled liquid refrigerant exits the condenser and flows to the Receiver/Dehydrator (R/D).

The R/D contains desiccant that absorbs moisture that may be in the refrigerant system. The R/D also acts as a storage vessel to ensure that a steady flow of liquid reaches the thermal expansion valve. The refrigerant exits the R/D and flows through the liquid line to the thermal expansion valve.

The thermal expansion valve is located at the front of dash and attaches to the evaporator inlet and outlet pipes. The thermal expansion valve is the dividing point for the high and the low pressure sides of the A/C system. As the refrigerant passes through the thermal expansion valve, the pressure on the refrigerant is lowered. The thermal expansion valve also meters the amount of liquid refrigerant that can flow into the evaporator.

Refrigerant exiting the thermal expansion valve flows into the evaporator core in a low pressure, liquid state. Ambient air is drawn through the HVAC control module and passes through the evaporator core. Warm and moist air will cause the liquid refrigerant boil inside of the evaporator core. The boiling refrigerant absorbs heat from the ambient air and draws moisture onto the evaporator. The refrigerant exits the evaporator through the suction line and back to the A/C compressor, in a vapor state, and completing the A/C cycle of heat removal. At the A/C compressor, the refrigerant is compressed again and the cycle of heat removal is repeated.

The conditioned air is distributed through the HVAC control module for passenger comfort. The heat and moisture removed from the passenger compartment will also change form, or condense, and is discharged from the HVAC control module as water.

Actuator Recalibration

Note. Do not adjust any controls on the HVAC control module while it is performing self-calibration. Interruption could cause the HVAC system to malfunction.

When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following

1. Place the ignition switch to the OFF position.
2. Disconnect the scan tool.
3. Install the HVAC control module.
4. Connect all previously disconnected components.
5. Ignition ON.
6. Wait 40 s for the HVAC control module to self-calibrate.
7. Verify that no DTCs have set as current DTCs.

When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC actuator be sure to perform one of the following

Electrical Information Reference

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Circuit/System Verification

1. Verify that DTC B1405 02 or B1405 05 is not set.
2. If DTC is present, refer to «AMBIENT LIGHT/SUNLOAD SENSOR POWER SUPPLY MALFUNCTION»(ref-653671-S29522843172014090100000) .
3. Verify that DTC B0163 02 or B0163 05 is not set.
4. If DTC is present, refer to «PASSENGER COMPARTMENT TEMPERATURE SENSOR CIRCUIT MALFUNCTION»(ref-653671-S25597128032014090100000) .
5. Verify that DTC B0183 02 or B0183 05 is not set.
6. If DTC is present, refer to «SUNLOAD SENSOR CIRCUIT MALFUNCTION»(ref-653671-S38470513672014090100000) .
7. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Passenger Compartment Air Temperature parameter. The measured temperature should be within 5°C (9°F) difference of parameter value.
8. If not within the specified range, replace the B10B Ambient Light/Sunload Sensor.

Ambient Light/Sunload Sensor Power Supply Malfunction

1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor and the X1 harness connector at the K33 HVAC Control Module.
2. Test for less than 5 ohms between the B10B Ambient Light/Sunload Sensor ground circuit terminal 6 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, test for less than 0.3 V between the reference voltage circuit terminal 2 and ground.
5. If greater than the specified range, test the reference voltage circuit for a short to voltage.
6. Ignition OFF, test for infinite resistance between the reference voltage circuit terminal 2 and ground.
7. If less than the specified value, test the reference voltage circuit for a short to ground.
8. Test for less than 5 ohms between the B10B Ambient Light/Sunload Sensor reference voltage circuit terminal 2 and control circuit terminal 20 X1 at the K33 HVAC Control Module harness connector.
9. If the value is greater than the specified value, test the reference voltage circuit for an open circuit/high resistance.
10. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor and verify the DTC does not reset.
11. If the DTC resets, replace the K33 HVAC Control Module.

Passenger Compartment Temperature Sensor Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
2. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 3 and ground.
3. If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
4. If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module.
5. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor and verify the DTC does not reset.
6. If the DTC resets, replace the K33 HVAC Control Module.

Sunload Sensor Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
2. Disconnect the harness connector X1 at the K33 HVAC Control Module.
3. Ignition ON, test for less than 0.3 V between the signal circuit terminal 4 and ground.
4. If greater than the specified range, test the signal circuit for a short to voltage.
5. Ignition OFF, test for infinite resistance between the signal circuit terminal 4 and ground.
6. If less than the specified value, test the signal circuit for a short to ground.
7. Test for less than 5 ohms between the B10B Ambient Light/Sunload Sensor signal circuit terminal 4 and control circuit terminal 13 X1 at the K33 HVAC Control Module harness connector.
8. If greater then the specified value, test the signal circuit for an open circuit/high resistance.
9. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor and verify the DTC does not reset.
10. If the DTC resets, replace the K33 HVAC Control Module.

Repair Instructions

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «SUN LOAD TEMPERATURE AND HEADLAMP AUTOMATIC CONTROL AMBIENT LIGHT SENSOR REPLACEMENT»(ref-653671-S29128768922014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Verify that no DTC is set.
2. If a DTC is present, refer to «CIRCUIT/SYSTEM TESTING»(ref-653671-S24904664722014090100000) .
3. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct Actual parameter. The measured temperature should be within 5°C (9°F) difference of appropriate Duct Actual parameter value.
4. If not within the specified range, replace the appropriate duct temperature sensor.
5. Measure actual evaporator temperature using a thermometer. Compare this value to the scan tool A/C Evaporator Temperature Sensor parameter. The measured temperature should be within 5°C (9°F) difference of parameter value.
6. If not within the specified range, replace the B39 A/C Evaporator Temperature Sensor.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «DUCT AIR TEMPERATURE SENSOR REPLACEMENT - UPPER LEFT SIDE (LEFT HAND DRIVE)»(ref-653671-S08598943492014090100000)
2. «DUCT AIR TEMPERATURE SENSOR REPLACEMENT - LOWER LEFT SIDE (RIGHT HAND DRIVE)»(ref-653671-S41569294392014090100000) or «DUCT AIR TEMPERATURE SENSOR REPLACEMENT - LOWER LEFT SIDE (LEFT HAND DRIVE)»(ref-653671-S42627068812014090100000)
3. «DUCT AIR TEMPERATURE SENSOR REPLACEMENT - UPPER RIGHT SIDE (RIGHT HAND DRIVE)»(ref-653671-S12734217652014090100000) or «DUCT AIR TEMPERATURE SENSOR REPLACEMENT - UPPER RIGHT SIDE (LEFT HAND DRIVE)»(ref-653671-S17883439122014090100000)
4. «DUCT AIR TEMPERATURE SENSOR REPLACEMENT - LOWER RIGHT SIDE (LEFT HAND DRIVE)»(ref-653671-S22191696672014090100000)
5. «AIR CONDITIONING REFRIGERANT TEMPERATURE SENSOR REPLACEMENT (RIGHT HAND DRIVE)»(ref-653671-S31799641702014090100000) or «AIR CONDITIONING REFRIGERANT TEMPERATURE SENSOR REPLACEMENT (LEFT HAND DRIVE)»(ref-653671-S05884275742014090100000)
6. «INSIDE AIR TEMPERATURE SENSOR REPLACEMENT (CJ4 FRONT)»(ref-653671-S20802773552014090100000) or «INSIDE AIR TEMPERATURE SENSOR REPLACEMENT (CJ4)»(ref-653671-S10152179852014090100000)
7. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Verify that DTC B1395 03 or B1395 07 is not present.
2. If DTC is present, refer to «WINDSHIELD TEMPERATURE AND INSIDE MOISTURE SENSOR POWER SUPPLY MALFUNCTION»(ref-653671-S13116659522014090100000) .
3. Verify that DTC B048C 02 or B048C 05 is not present.
4. If DTC is present, refer to «HUMIDITY SENSOR HUMIDITY CIRCUIT MALFUNCTION»(ref-653671-S41360090222014090100000) .
5. Verify that DTC B048F 02 or B048F 05 is not present.
6. If DTC is present, refer to «HUMIDITY SENSOR TEMPERATURE CIRCUIT MALFUNCTION»(ref-653671-S02352179902014090100000) .
7. Verify that DTC B018A 02 or B018A 05 is not present.
8. If DTC is present, refer to «WINDSHIELD TEMPERATURE SENSOR CIRCUIT MALFUNCTION»(ref-653671-S38137963712014090100000) .
9. Measure actual temperature using a thermometer at the windshield temperature and inside moisture sensor. Compare this value to the scan tool Passenger Compartment Humidity Sensor Temperature parameter. The measured temperature should be within 5°C (9°F) difference of parameter value.
10. If not within the specified range, replace the B160 Windshield Temperature and Inside Moisture Sensor.
11. Measure actual temperature using a thermometer at the windshield temperature and inside moisture sensor. Compare this value to the scan tool Windshield Temperature parameter. The measured temperature should be within 5°C (9°F) difference of parameter value.
12. If not within the specified range, replace the B160 Windshield Temperature and Inside Moisture Sensor.

Windshield Temperature and Inside Moisture Sensor Power Supply Malfunction

1. Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor.
2. Test for less than 5 ohms between the ground circuit terminal 3 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, test for 4.8-5.2 V between the ground circuit terminal 3 and the reference voltage circuit terminal 1.
5. If less than the specified range, test the reference voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
6. If greater than the specified range, test the reference voltage circuit for a short to voltage. If the circuit tests normal, replace the K33 HVAC Control Module.
7. If all circuits test normal, replace the B160 Windshield Temperature and Inside Moisture Sensor.

Humidity Sensor Humidity Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor.
2. Test for less than 5 ohms between the ground circuit terminal 3 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, test for 4.8-5.2 V between the ground circuit terminal 3 and the reference voltage circuit terminal 1.
5. If less than the specified range, test the reference voltage circuit for an open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
6. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.
7. If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
8. If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module.
9. If all circuits test normal, replace the B160 Windshield Temperature and Inside Moisture Sensor and verify the DTC does not reset.
10. If the DTC resets, replace the K33 HVAC Control Module.

Humidity Sensor Temperature Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor.
2. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 5 and ground.
3. If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
4. If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module.
5. If all circuits test normal, replace the B160 Windshield Temperature and Inside Moisture Sensor and verify the DTC does not reset.
6. If the DTC resets, replace the K33 HVAC Control Module.

Windshield Temperature Sensor Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor.
2. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 4 and ground.
3. If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
4. If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module.
5. If all circuits test normal, replace the B160 Windshield Temperature and Inside Moisture Sensor and verify the DTC does not reset.
6. If the DTC resets, replace the K33 HVAC Control Module.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «INSIDE AIR MOISTURE AND WINDSHIELD TEMPERATURE SENSOR REPLACEMENT»(ref-653671-S21566197912014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming
2. «HEATER AND BLOWER AND AIR CONDITIONING CONTROL MODULE REPLACEMENT»(ref-653671-S17667075732014090100000)

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «AUXILIARY HEATER AND AIR CONDITIONING CONTROL MODULE REPLACEMENT»(ref-653671-S38844337942014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Verify that DTC B023A 02 is not present.
2. If DTC is present, refer to «ACTUATOR POWER SUPPLY MALFUNCTION»(ref-653671-S36612625852014090100000) .
3. Verify that DTC B0223 01 or B0223 06 is not present.
4. If DTC is present, refer to «RECIRCULATION ACTUATOR MALFUNCTION»(ref-653671-S07843173022014090100000) .
5. Verify that DTC B022A 01 or B022A 06 is not present.
6. If DTC is present, refer to «AIR INLET ACTUATOR MALFUNCTION»(ref-653671-S24296150262014090100000) .
7. Verify that DTC B0233 01 or B0233 06 is not present.
8. If DTC is present, refer to «MODE ACTUATOR MALFUNCTION»(ref-653671-S25960763052014090100000) .
9. Verify that DTC B0408 01 or B0408 06 is not present.
10. If DTC is present, refer to «AIR TEMPERATURE ACTUATOR - LEFT MALFUNCTION»(ref-653671-S23709124602014090100000) .
11. Verify that DTC B0418 01 or B0418 06 is not present.
12. If DTC is present, refer to «AIR TEMPERATURE ACTUATOR - RIGHT MALFUNCTION»(ref-653671-S11179659352014090100000) .
13. Verify that DTC B0428 01 or B0428 06 is not present.
14. If DTC is present, refer to «REAR AIR TEMPERATURE ACTUATOR MALFUNCTION»(ref-653671-S10308579322014090100000) .
15. Verify that DTC B3531 01 or B3531 06 is not present.
16. If DTC is present, refer to «REAR MODE ACTUATOR MALFUNCTION»(ref-653671-S11696876102014090100000) .

Actuator Power Supply Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module.
2. Test for infinite resistance between the reference voltage circuit terminal 15 X3 and ground
3. If less than the specified value, test the reference voltage circuit for a short to ground.
4. Test for infinite resistance between the reference voltage circuit terminal 10 X4 and ground
5. If less than the specified value, test the reference voltage circuit for a short to ground.
6. If all circuits test normal, test or replace the K33 HVAC Control Module.

Recirculation Actuator Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M46 Air Recirculation Door Motor.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal at the K33 HVAC Control Module harness connector listed below and ground: Terminal 16 X3 Terminal 17 X3 Terminal 18 X3 Terminal 19 X3
3. If greater than the specified value, test the control circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the control circuit terminal at the K33 HVAC Control Module harness connector listed below and ground: Terminal 16 X3 Terminal 17 X3 Terminal 18 X3 Terminal 19 X3
5. If less than the specified value, test the control circuit for a short to ground.
6. Test for less than 5 ohms between the control circuit terminals listed below: M46 Air Recirculation Door Motor terminal 1 and terminal 16 X3 at the K33 HVAC Control Module harness connector M46 Air Recirculation Door Motor terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector M46 Air Recirculation Door Motor terminal 3 and terminal 17 X3 at the K33 HVAC Control Module harness connector M46 Air Recirculation Door Motor terminal 4 and terminal 18 X3 at the K33 HVAC Control Module harness connector M46 Air Recirculation Door Motor terminal 6 and terminal 19 X3 at the K33 HVAC Control Module harness connector
7. If greater than the specified value, test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the M46 Air Recirculation Door Motor and verify the DTC does not reset.
9. If the DTC resets, replace the K33 HVAC Control Module.

Air Inlet Actuator Malfunction

1. Ignition OFF, disconnect the X3 and the X4 harness connector at the K33 HVAC Control Module and at the M4 Air Inlet Actuator.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground: Terminal 1 X4 Terminal 2 X4 Terminal 3 X4 Terminal 4 X4
3. If greater than the specified value, test the control circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground: Terminal 1 X4 Terminal 2 X4 Terminal 3 X4 Terminal 4 X4
5. If less than the specified value, test the control circuit for a short to ground.
6. Test for less than 5 ohms between the control circuit terminals listed below: M4 Air Inlet Actuator terminal 1 and terminal 1 X4 at the K33 HVAC Control Module harness connector M4 Air Inlet Actuator terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector M4 Air Inlet Actuator terminal 3 and terminal 2 X4 at the K33 HVAC Control Module harness connector M4 Air Inlet Actuator terminal 4 and terminal 3 X4 at the K33 HVAC Control Module harness connector M4 Air Inlet Actuator terminal 6 and terminal 4 X4 at the K33 HVAC Control Module harness connector
7. If greater than the specified value, test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the M4 Air Inlet Actuator and verify the DTC does not reset.
9. If the DTC resets, replace the K33 HVAC Control Module.

Mode Actuator Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M37 Mode Door Actuator.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground: Terminal 2 X3 Terminal 3 X3 Terminal 4 X3 Terminal 5 X3
3. If greater than the specified value, test the control circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground: Terminal 2 X3 Terminal 3 X3 Terminal 4 X3 Terminal 5 X3
5. If less than the specified value, test the control circuit for a short to ground.
6. Test for less than 5 ohms between the control circuit terminals listed below: M37 Mode Door Actuator terminal 1 and terminal 2 X3 at the K33 HVAC Control Module harness connector M37 Mode Door Actuator terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector M37 Mode Door Actuator terminal 3 and terminal 3 X3 at the K33 HVAC Control Module harness connector M37 Mode Door Actuator terminal 4 and terminal 4 X3 at the K33 HVAC Control Module harness connector M37 Mode Door Actuator terminal 6 and terminal 5 X3 at the K33 HVAC Control Module harness connector
7. If greater than the specified value, test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the M37 Mode Door Actuator and verify the DTC does not reset.
9. If the DTC resets, replace the K33 HVAC Control Module.

Air Temperature Actuator - Left Malfunction

1. Ignition OFF, disconnect the X3 harness connector at the K33 HVAC Control Module and at the M6L Air Temperature Door Actuator - Left.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground: Terminal 11 X3 Terminal 12 X3 Terminal 13 X3 Terminal 14 X3
3. If greater than the specified value, test the control circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground: Terminal 11 X3 Terminal 12 X3 Terminal 13 X3 Terminal 14 X3
5. If less than the specified value, test the control circuit for a short to ground.
6. Test for less than 5 ohms between the control circuit terminals listed below: M6L Air Temperature Door Actuator - Left terminal 1 and terminal 11 X3 at the K33 HVAC Control Module harness connector M6L Air Temperature Door Actuator - Left terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector M6L Air Temperature Door Actuator - Left terminal 3 and terminal 12 X3 at the K33 HVAC Control Module harness connector M6L Air Temperature Door Actuator - Left terminal 4 and terminal 13 X3 at the K33 HVAC Control Module harness connector M6L Air Temperature Door Actuator - Left terminal 6 and terminal 14 X3 at the K33 HVAC Control Module harness connector
7. If greater than the specified value, test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the M6L Air Temperature Door Actuator - Left and verify the DTC does not reset.
9. If the DTC resets, replace the K33 HVAC Control Module.

Air Temperature Actuator - Right Malfunction

1. Ignition OFF, disconnect the X3 and the X4 harness connector at the K33 HVAC Control Module and at the M6R Air Temperature Door Actuator - Right.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground: Terminal 5 X4 Terminal 6 X4 Terminal 7 X4 Terminal 8 X4
3. If greater than the specified value, test the control circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground: Terminal 5 X4 Terminal 6 X4 Terminal 7 X4 Terminal 8 X4
5. If less than the specified value, test the control circuit for a short to ground.
6. Test for less than 5 ohms between the control circuit terminals listed below: M6R Air Temperature Door Actuator - Right terminal 1 and terminal 5 X4 at the K33 HVAC Control Module harness connector M6R Air Temperature Door Actuator - Right terminal 2 and terminal 15 X3 at the K33 HVAC Control Module harness connector M6R Air Temperature Door Actuator - Right terminal 3 and terminal 6 X4 at the K33 HVAC Control Module harness connector M6R Air Temperature Door Actuator - Right terminal 4 and terminal 7 X4 at the K33 HVAC Control Module harness connector M6R Air Temperature Door Actuator - Right terminal 6 and terminal 8 X4 at the K33 HVAC Control Module harness connector
7. If greater than the specified value, test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the M6R Air Temperature Door Actuator - Right and verify the DTC does not reset.
9. If the DTC resets, replace the K33 HVAC Control Module.

Rear Air Temperature Actuator Malfunction

1. Ignition OFF, disconnect the X4 harness connector at the K33 HVAC Control Module and at the M37B Mode Door Actuator - Auxiliary.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground: Terminal 17 X4 Terminal 18 X4 Terminal 19 X4 Terminal 20 X4
3. If greater than the specified value, test the control circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground: Terminal 17 X4 Terminal 18 X4 Terminal 19 X4 Terminal 20 X4
5. If less than the specified value, test the control circuit for a short to ground.
6. Test for less than 5 ohms between the control circuit terminals listed below: M37B Mode Door Actuator - Auxiliary terminal 1 and terminal 17 X4 at the K33 HVAC Control Module harness connector M37B Mode Door Actuator - Auxiliary terminal 2 and terminal 10 X4 at the K33 HVAC Control Module harness connector M37B Mode Door Actuator - Auxiliary terminal 3 and terminal 18 X4 at the K33 HVAC Control Module harness connector M37B Mode Door Actuator - Auxiliary terminal 4 and terminal 19 X4 at the K33 HVAC Control Module harness connector M37B Mode Door Actuator - Auxiliary terminal 6 and terminal 20 X4 at the K33 HVAC Control Module harness connector
7. If greater than the specified value, test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the M37B Mode Door Actuator - Auxiliary and verify the DTC does not reset.
9. If the DTC resets, replace the K33 HVAC Control Module.

Rear Mode Actuator Malfunction

1. Ignition OFF, disconnect the X4 harness connector at the K33 HVAC Control Module and at the M6B Air Temperature Door Actuator - Auxiliary.
2. Ignition ON, test for less than 0.3 V between the control circuit terminal listed below and ground: Terminal 13 X4 Terminal 14 X4 Terminal 15 X4 Terminal 16 X4
3. If greater than the specified value, test the control circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the control circuit terminal listed below and ground: Terminal 13 X4 Terminal 14 X4 Terminal 15 X4 Terminal 16 X4
5. If less than the specified value, test the control circuit for a short to ground.
6. Test for less than 5 ohms between the control circuit terminals listed below: M6B Air Temperature Door Actuator - Auxiliary terminal 1 and terminal 13 X4 at the K33 HVAC Control Module harness connector M6B Air Temperature Door Actuator - Auxiliary terminal 2 and terminal 10 X4 at the K33 HVAC Control Module harness connector M6B Air Temperature Door Actuator - Auxiliary terminal 3 and terminal 14 X4 at the K33 HVAC Control Module harness connector M6B Air Temperature Door Actuator - Auxiliary terminal 4 and terminal 15 X4 at the K33 HVAC Control Module harness connector M6B Air Temperature Door Actuator - Auxiliary terminal 6 and terminal 16 X4 at the K33 HVAC Control Module harness connector
7. If greater than the specified value, test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the M6B Air Temperature Door Actuator - Auxiliary and verify the DTC does not reset.
9. If the DTC resets, replace the K33 HVAC Control Module.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «TEMPERATURE VALVE ACTUATOR REPLACEMENT - LEFT SIDE (RIGHT HAND DRIVE)»(ref-653671-S13735517472014090100000) or «TEMPERATURE VALVE ACTUATOR REPLACEMENT - LEFT SIDE (LEFT HAND DRIVE)»(ref-653671-S04671541042014090100000)
2. «TEMPERATURE VALVE ACTUATOR REPLACEMENT - RIGHT SIDE (LEFT HAND DRIVE)»(ref-653671-S26181988492014090100000)
3. «MODE CONTROL CAM ACTUATOR REPLACEMENT (RIGHT HAND DRIVE)»(ref-653671-S21249972522014090100000) or «MODE CONTROL CAM ACTUATOR REPLACEMENT (LEFT HAND DRIVE)»(ref-653671-S33988361422014090100000)
4. «AIR INLET VALVE ACTUATOR REPLACEMENT (RIGHT HAND DRIVE)»(ref-653671-S26913508282014090100000) or «AIR INLET VALVE ACTUATOR REPLACEMENT (LEFT HAND DRIVE)»(ref-653671-S32295918882014090100000)
5. «INSIDE AIR VALVE ACTUATOR REPLACEMENT (RIGHT HAND DRIVE)»(ref-653671-S34433312382014090100000)
6. «AUXILIARY TEMPERATURE VALVE ACTUATOR REPLACEMENT»(ref-653671-S05489957572014090100000)
7. «AUXILIARY MODE VALVE ACTUATOR REPLACEMENT»(ref-653671-S15729613502014090100000)
8. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Verify that DTC B048D 01 or B048D 06 is not set.
2. If DTC is present, refer to «ELECTRICAL AUXILIARY HEATER CONTROL CIRCUIT MALFUNCTION»(ref-653671-S18304588832014090100000) .
3. Verify that DTC B048E 00 is not set.
4. If DTC is present, refer to «ELECTRICAL AUXILIARY HEATER SIGNAL CIRCUIT MALFUNCTION»(ref-653671-S35181152952014090100000) .

Electrical Auxiliary Heater Control Circuit Malfunction

1. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module and the X1 harness connector at the E40 Electrical Auxiliary Heater.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 X1 and ground.
3. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Test for less than 0.3 V between the control circuit terminal 7 X2 at the K33 HVAC Control Module harness connector and ground.
5. If greater than the specified range, test the control circuit for a short to voltage.
6. Ignition OFF, test for infinite resistance between the control circuit terminal 7 X2 at the K33 HVAC Control Module harness connector and ground.
7. If less than the specified value, test the control circuit for a short to ground.
8. Test for less than 5 ohms between the K33 HVAC Control Module control circuit terminal 7 X2 and control circuit terminal 1 X1 at the E40 Electrical Auxiliary Heater harness connector.
9. If greater than the specified value, test the control circuit for an open/high resistance.
10. If all circuits test normal, replace the E40 Electrical Auxiliary Heater and verify the DTC does not reset.
11. If the DTC resets, replace the K33 HVAC Control Module.

Electrical Auxiliary Heater Signal Circuit Malfunction

1. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module and the harness connectors at the E40 Electrical Auxiliary Heater.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 X2 at the E40 Electrical Auxiliary Heater harness connector and ground.
3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Verify that a test lamp illuminates between the B+ circuit terminal 1 X2 and ground circuit terminal 1 X3.
5. If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
6. Verify that a test lamp illuminates between the ignition circuit terminal 2 X1 and ground circuit terminal 1 X3.
7. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
8. Test for less than 0.3 V between the signal circuit terminal 5 X2 at the K33 HVAC Control Module harness connector and ground.
9. If greater than the specified range, test the signal circuit for a short to voltage.
10. Ignition OFF, test for infinite resistance between the signal circuit terminal 5 X2 at the K33 HVAC Control Module harness connector and ground.
11. If less than the specified value, test the signal circuit for a short to ground.
12. Test for less than 5 ohms between the K33 HVAC Control Module signal circuit terminal 5 X2 and signal circuit terminal 4 X1 at the E40 Electrical Auxiliary Heater harness connector.
13. If greater than the specified value, test the circuit for an open circuit/high resistance.
14. If all circuits test normal, replace the E40 Electrical Auxiliary Heater and verify the DTC does not reset.
15. If the DTC resets, replace the K33 HVAC Control Module.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «AUXILIARY HEATER CORE REPLACEMENT»(ref-653641-S29428089292014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Verify that DTC B3843 08 is not present.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «AMBIENT AIR QUALITY SENSOR REPLACEMENT»(ref-653671-S39513416382014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «AIR CONDITIONING COMPRESSOR REPLACEMENT (LAU/A28NER)»(ref-653641-S19132264222014090100000) or «AIR CONDITIONING COMPRESSOR REPLACEMENT (LHU/A20NFT)»(ref-653641-S24704680312014090100000) .
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming.

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «TECHNICAL DATA»(ref-653635-S21313218492014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000)

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «UNDERHOOD ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT»(ref-653659-S03303261042014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for Engine Control Module replacement, setup, and programming

Symptoms - HVAC Systems - Automatic

Note. The following steps must be completed before using the symptom tables

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «AUTOMATIC HVAC DESCRIPTION AND OPERATION»(ref-653671-S00297201372014090100000) .

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS .

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «AIR CONDITIONING COMPRESSOR REPLACEMENT (LAU/A28NER)»(ref-653641-S19132264222014090100000) or «AIR CONDITIONING COMPRESSOR REPLACEMENT (LHU/A20NFT)»(ref-653641-S24704680312014090100000)
2. «INSTRUMENT PANEL LOWER CENTER TRIM PANEL REPLACEMENT»(ref-653664-S23749349312014090100000)
3. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «TECHNICAL DATA»(ref-653635-S21313218492014090100000)
2. «HEATER AND AIR CONDITIONING CONTROL REPLACEMENT»(ref-653671-S39745481342014090100000)
3. «UNDERHOOD ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENT»(ref-653659-S03303261042014090100000)
4. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC Control Module or Engine Control Module replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Ignition ON, press and release the blower speed increase switch. Verify the scan tool Blower Motor Switch parameter changes between Inactive and Up.
2. If not the specified value, replace the A20 Radio/HVAC Controls.
3. Press and release the blower speed decrease switch. Verify the scan tool Blower Motor Switch parameter changes between Inactive and Down.
4. If not the specified value, replace the A20 Radio/HVAC Controls.
5. Press and release the AUTO Switch. Verify the scan tool Auto HVAC Button parameter changes between Active and Inactive.
6. If not the specified value, replace the A20 Radio/HVAC Controls.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming
2. «HEATER AND BLOWER AND AIR CONDITIONING CONTROL MODULE REPLACEMENT»(ref-653671-S17667075732014090100000)
3. «BLOWER MOTOR REPLACEMENT»(ref-653641-S05586709172014090100000)
4. «HEATER AND AIR CONDITIONING CONTROL REPLACEMENT»(ref-653671-S39745481342014090100000)

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Ignition ON, press and release the blower speed increase switch. Verify the scan tool Auxiliary Blower Motor Switch parameter. The reading should correspond to the selected blower step.
2. If not the specified value, replace the A21 Radio/HVAC Controls - Auxiliary.
3. Press and release the blower speed decrease switch. Verify the scan tool Auxiliary Blower Motor Switch parameter. The reading should correspond to the selected blower step.
4. If not the specified value, replace the A21 Radio/HVAC Controls - Auxiliary.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «AUXILIARY HEATER AND AIR CONDITIONING CONTROL MODULE REPLACEMENT»(ref-653671-S38844337942014090100000)
2. «HEATER AND AIR CONDITIONING AND RADIO CONTROL MODULE REPLACEMENT»(ref-653672-S14864750892014090100000)
3. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Ignition ON, measure actual inside air temperature using a thermometer. Compare this value to the scan tool Passenger Compartment Air Temperature parameter. The measured temperature should be within 5°C (9°F) difference of parameter value.
2. If not within the specified range, refer to «DTC B0163, B0183, OR B1405»(ref-653671-S38128164042014090100000) .
3. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct Actual parameter. The measured temperature should be within 5°C (9°F) difference of appropriate Duct Actual parameter value.
4. If not within the specified range, refer to «DTC B0173, B0178, B0509, B0514, B0519, B3583, OR B3933»(ref-653671-S35612086902014090100000) .
5. Measure actual evaporator temperature using a thermometer. Compare this value to the scan tool A/C Evaporator Temperature Sensor parameter. The measured temperature should be within 5°C (9°F) difference of parameter value.
6. If not within the specified range, refer to «DTC B0173, B0178, B0509, B0514, B0519, B3583, OR B3933»(ref-653671-S35612086902014090100000) .
7. Observe the scan tool Sunload parameter. The reading should be between 50-1 150 W/m 2 and change with sunlight intensity.
8. If not within the specified range or not change, refer to «DTC B0163, B0183, OR B1405»(ref-653671-S38128164042014090100000) .
9. Engine is running, activate and deactivate the A/C switch. Verify the A/C compressor can be activated and deactivated.
10. If the A/C compressor cannot be activated or deactivated, refer to «AIR CONDITIONING COMPRESSOR MALFUNCTION (LAU, LBR, LBS, LDK, OR LHU)»(ref-653671-S07871596382014090100000) or «AIR CONDITIONING COMPRESSOR MALFUNCTION (LLU)»(ref-653671-S41738334052014090100000) .
11. Verify the engine reaches its operating temperature.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «TEMPERATURE VALVE ACTUATOR REPLACEMENT - LEFT SIDE (RIGHT HAND DRIVE)»(ref-653671-S13735517472014090100000) or «TEMPERATURE VALVE ACTUATOR REPLACEMENT - LEFT SIDE (LEFT HAND DRIVE)»(ref-653671-S04671541042014090100000)
2. «TEMPERATURE VALVE ACTUATOR REPLACEMENT - RIGHT SIDE (LEFT HAND DRIVE)»(ref-653671-S26181988492014090100000)
3. «INSTRUMENT PANEL LOWER CENTER TRIM PANEL REPLACEMENT»(ref-653664-S23749349312014090100000)
4. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct Actual parameter. The measured temperature should be within 5°C (9°F) difference of appropriate Duct Actual parameter value.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «AUXILIARY TEMPERATURE VALVE ACTUATOR REPLACEMENT»(ref-653671-S05489957572014090100000)
2. «HEATER AND AIR CONDITIONING AND RADIO CONTROL MODULE REPLACEMENT»(ref-653672-S14864750892014090100000)
3. «INSTRUMENT PANEL LOWER CENTER TRIM PANEL REPLACEMENT»(ref-653664-S23749349312014090100000)
4. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «MODE CONTROL CAM ACTUATOR REPLACEMENT (RIGHT HAND DRIVE)»(ref-653671-S21249972522014090100000) or «MODE CONTROL CAM ACTUATOR REPLACEMENT (LEFT HAND DRIVE)»(ref-653671-S33988361422014090100000)
2. «INSTRUMENT PANEL LOWER CENTER TRIM PANEL REPLACEMENT»(ref-653664-S23749349312014090100000)
3. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HEATER AND AIR CONDITIONING AND RADIO CONTROL MODULE REPLACEMENT»(ref-653672-S14864750892014090100000)
2. «AUXILIARY MODE VALVE ACTUATOR REPLACEMENT»(ref-653671-S15729613502014090100000) for auxiliary mode valve actuator replacement
3. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «INSIDE AIR VALVE ACTUATOR REPLACEMENT (RIGHT HAND DRIVE)»(ref-653671-S34433312382014090100000)
2. «AIR INLET VALVE ACTUATOR REPLACEMENT (RIGHT HAND DRIVE)»(ref-653671-S26913508282014090100000) or «AIR INLET VALVE ACTUATOR REPLACEMENT (LEFT HAND DRIVE)»(ref-653671-S32295918882014090100000)
3. «INSTRUMENT PANEL LOWER CENTER TRIM PANEL REPLACEMENT»(ref-653664-S23749349312014090100000)
4. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for HVAC control module replacement, setup, and programming

Afterblow Enabling

The afterblow mode can be enabled using the scan tool. The afterblow mode allows the blower motor to operate after the engine has been turned off. This operation of the blower motor dries the evaporator core, which reduces the amount of microbial growth which can create undesirable odors.

Use the following procedure in order to enable the afterblow mode

1. Connect diagnostic tool.
2. Turn ON the ignition, with the engine OFF.
3. Build the vehicle with the scan tool.
4. Select Module Diagnosis.
5. Select Remote Heater and Air Conditioning Control Module.
6. Select Configuration/Reset Functions.
7. Select HVAC Afterblow Configuration.

When afterblow has been enabled by the scan tool the blower motor will operate at 68% blower speed for 2 min 30 s to 4 min after the engine has been in Key OFF for 30 min.

The following conditions must be met for the HVAC module to operate the afterblow

1. The outside air temperature must be at least 21°C (70°F).
2. The A/C compressor must have operated during the latest key cycle.
3. The engine must be turned off for at least 30 min.
4. The system voltage must be at least 12 V.

Time studies - ACC

Correction

1. 01 - Replacement
2. 02 - Removal - Refit
3. 03 - Renovate
4. 04 - Paint
5. 05 - Adjust
6. 06 - Change comp. unit
7. 07 - Lubricate - Clean - Polish
8. 08- Check/Fault search
9. 09 - Expose
10. 10 - Install new
11. 11 - Transfer

Master Electrical Component List

Link to end views of connectors: COMPONENT CONNECTOR END VIEWS

List of components

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

Scheme 152