Automatic Climate Control, Acc: Other Saab 9-4X I

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 the 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 flap - auxiliary 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 air temperature flap actuator - auxiliary moves the rear mixed air flap into the calculated position, in order to reach the temperature selected with 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 intake 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 3°C (38°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

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 performance data. 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. As 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 HVAC control module and 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

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 the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

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-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

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-652258-S01084130632014082300000) .
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-652258-S24899897372014082300000) .
5. Verify that DTC B0183 02 or B0183 05 is not set.
6. If DTC is present, refer to «SUNLOAD SENSOR CIRCUIT MALFUNCTION»(ref-652258-S16538878202014082300000) .
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.
2. Test for less than 10 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. If the circuit tests normal, replace the K33 HVAC Control Module.
4. Ignition ON, test for battery voltage between the reference voltage circuit terminal 2 and ground.
5. If greater than the specified range, test the reference voltage circuit for an open or short to ground. If the circuit tests normal, replace the K33 HVAC Control Module.
6. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.

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.

Sunload 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 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 B10B Ambient Light/Sunload Sensor.

Repair Instructions

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

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. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000)

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

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-652258-S28683912612014082300000) .
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-652258-S15670755722014082300000) .
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-652258-S20962174712014082300000) .
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-652258-S04272157722014082300000) .
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 10 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 4.8-5.2 V between the signal circuit terminal 2 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.

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.

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.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

1. Verify that DTC B023A 02 is not present.
2. If DTC is present, refer to «ACTUATOR POWER SUPPLY MALFUNCTION»(ref-652258-S21885764522014082300000) .
3. Verify that DTC B0223, B022A, B0233, B0408 or B0418 is not set.
4. If DTC is present, refer to «ACTUATOR MALFUNCTION»(ref-652258-S38703313722014082300000) .

Actuator Power Supply Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Ignition ON, verify that a test lamp illuminates between the 12 volt reference circuit terminal 2 and ground.
3. If the test lamp does not illuminate, test the 12 volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal test or replace the K33 HVAC control module.

Actuator Malfunction

1. Ignition OFF, disconnect the X3 and X4 harness connector at the K33 HVAC Control Module.
2. Ignition ON, test for 80-200 ohms between the 12 V reference voltage circuit terminal 15 X3 and each control circuit terminal of the appropriate actuator.
3. If less than the specified range, test for the 12 V reference voltage circuit and the control circuit for a short circuit. If the circuits test normal, replace the appropriate actuator.
4. If greater than the specified range, test the 12 V reference voltage circuit and the control circuit for an open/high resistance. If the circuits test normal, replace the appropriate actuator.
5. If all circuits test normal, replace the K33 HVAC Control Module

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

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-652258-S00398481992014082300000) .
3. Verify that DTC B048E 00 is not set.
4. If DTC is present, refer to «ELECTRICAL AUXILIARY HEATER SIGNAL CIRCUIT MALFUNCTION»(ref-652258-S26150834232014082300000) .

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.

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/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.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

If this DTC is retrieved as a current DTC, replace the radio/HVAC control.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for radio/HVAC control replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for HVAC Control Module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for HVAC control module replacement, setup, and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000)

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-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Note. Check for bulletins before proceeding.

1. Ignition ON, place the blower motor switch in each speed position. Verify that the blower motor operates properly in each position.
2. If the blower motor does not operate properly in all speeds, refer to «DTC B0193»(ref-652258-S22179882862014082300000) .
3. Ignition ON, place the auxiliary blower motor switch in each speed position. Verify that the auxiliary blower motor operates properly in each position.
4. If the auxiliary blower motor does not operate properly in all speeds, refer to «DTC B0208»(ref-652258-S03222562362014082300000) .
5. Using the scan tool observe the mode, temperature, air inlet and recirculation door positions. Verify the actual and commanded door positions are within 4 counts of each other.
6. If not within the specified range, refer to «CIRCUIT/SYSTEM TESTING»(ref-652258-S38890259292014082300000)
7. Engine ON, A/C ON, place the temperature control in the coldest position. Verify that cool air flows from the ducts in the vehicle.
8. If the air is not cool, refer to «AIR CONDITIONING (A/C) SYSTEM PERFORMANCE TEST»(ref-652243-S00959212252014082300000)
9. Turn the A/C OFF and place the temperature control in the warmest position.
10. If the air is insufficiently heated refer to «HEATING PERFORMANCE DIAGNOSTIC»(ref-652243-S30646829672014082300000) .
11. Engine OFF, ignition ON, cover the sunload sensor assembly with a shop towel or other suitable item. Verify the scan tool Sunload Sensor parameter changes.
12. If it does not change, refer to «CIRCUIT/SYSTEM TESTING»(ref-652258-S02251265072014082300000) «DTC B0163, B0183, OR B1405»(ref-652258-S24923283342014082300000) .
13. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Passenger Compartment Air Temp. Sensor parameter. The measured temperature should be within 5 degrees of parameter.
14. If not within the specified range, refer to «CIRCUIT/SYSTEM TESTING»(ref-652258-S02251265072014082300000) «DTC B0163, B0183, OR B1405»(ref-652258-S24923283342014082300000) .
15. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct parameter. The measured temperature should be within 5 degrees of appropriate Duct Temperature Sensor parameter.
16. If not within the specified range, refer to «CIRCUIT/SYSTEM TESTING»(ref-652258-S14332366302014082300000) .
17. Ignition ON, observe the scan tool A/C Evaporator Temperature Sensor parameter. The reading should be between -39°F (-35°C) and 185°F (85° C) and change with evaporator air temperature changes.
18. If not within the specified range, refer to «CIRCUIT/SYSTEM TESTING»(ref-652258-S14332366302014082300000) .

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «HVAC COMPONENT REPLACEMENT REFERENCE»(ref-652258-S18402375282014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) 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 the Scan 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