Home ReviewsRefund
Home/Saab/9-4X/Saab 9-4X I (2011-2011)/Repair manual/Automatic HVAC System/Automatic Climate Control, Acc: Diagnosis
Contents Wiring diagrams Section: Automatic HVAC System All sections

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

Automatic HVAC System ~4059 words

Preferred Method (with Scan Tool)

  1. 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. Clear all DTCs.
  2. Place the ignition switch in the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. With the scan tool, initiate the HVAC Actuators re-calibration feature of the Remote Heater and Air Conditioning Control Module Special Functions menu.
  7. Verify that no DTCs have set as current DTCs.

Alternate Method (without Scan Tool)

  1. 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. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC control module fuse for a minimum of 10 s.
  6. Install the HVAC control module fuse.
  7. Ignition ON.
  8. Wait 40 s for the HVAC control module to self-calibrate.
  9. Verify that no DTCs have set as current DTCs.
DTCDescription
DTC B0163Passenger Compartment Temperature Sensor Circuit
DTC B0183Solar Load Sensor Circuit
DTC B1405Control Module Voltage Reference Output 2 Circuit
DTC B0173Upper Left Duct Air Temperature Sensor Circuit
DTC B0178Lower Left Duct Air Temperature Sensor Circuit
DTC B0509Upper Right Duct Air Temperature Sensor Circuit
DTC B0514Lower Right Duct Air Temperature Sensor Circuit
DTC B0519Rear Upper Duct Air Temperature Sensor Circuit
DTC B3583Rear Lower Duct Air Temperature Sensor Circuit
DTC B3933Air Conditioning Evaporator Temperature Sensor Circuit
DTC B018AWindshield Temperature Sensor Circuit
DTC B048CHumidity Sensor Humidity Circuit
DTC B048FHumidity Sensor Temperature Circuit
DTC B1395Control Module Voltage Reference Output Circuit
DTC B0193Control Module Voltage Reference Output Circuit
DTC B0208Rear Blower Motor Speed Circuit
DTC B0223Recirculate Position Command 1 Circuit
DTC B022ARecirculate Position Command 2 Circuit
DTC B0233Air Flow Control Circuit
DTC B023AHVAC Actuators Supply Voltage Short to Ground
DTC B0408Main Temperature Control Circuit
DTC B0418Right Temperature Control Circuit
DTC B0428Rear Temperature Control Circuit
DTC B3531Rear Air Flow Control Circuit
DTC B048DAuxiliary Heater Temperature Command Circuit
DTC B048EAuxiliary Heater System Malfunction
DTC B1020Auxiliary Electronic Control Unit (ECU) Performance
DTC B3843Outside Air Quality Sensor Circuit
DTC B393BAir Conditioning Compressor Valve Control Circuit
DTC P0532Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit
DTC P0533Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit

AUTOMATIC CLIMATE CONTROL (ACC) DTC INDEX

Diagnostic Instructions

  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC Descriptor

DTC B0163 02

Passenger Compartment Temperature Sensor Circuit Short to Ground

DTC B0163 05

Passenger Compartment Temperature Sensor Circuit High Voltage/Open

DTC B0183 02

Solar Load Sensor Circuit Short to Ground

DTC B0183 05

Solar Load Sensor Circuit High Voltage/Open

DTC B1405 02

Control Module Voltage Reference Output 2 Circuit Short to Ground

DTC B1405 05

Control Module Voltage Reference Output 2 Circuit High Voltage/Open

Conditions for Running the DTC

  1. Ignition ON.
  2. The HVAC control module is ON.

Conditions for Setting the DTC

B0163 02 or B0163 05

The HVAC control module detects the sensor signal out of range. The signal voltage is less than 0.1 V or greater than 4.9 V for more than 50 ms.

B0183 02

The 5 V identification pulse is not received.

B0183 05

The input signal is static and greater than 4.8 V.

B1405 02

Clocked supply for multi zone sensor is shorted to ground.

B1405 05

Clocked supply for multi zone sensor is shorted to voltage or open.

Action Taken When the DTC Sets

  1. The system will use the last valid values as default.
  2. If no value is read at the time of fault, the HVAC Control Module uses 0 W/m 2 as intensity, 45° for elevation and -75° for azimuth.

Conditions for Clearing the DTC

B0163 02 or B0163 05

The sensor signal is within specified range between 0.1-4.9 V.

B0183 02

The 5 V identification pulse will be received.

B0183 05

The correct pulse signal succession will be received.

B1405 02 or B1405 05

The condition for setting the DTC is no longer present.

Scan Tool Reference

CONTROL MODULE REFERENCES for scan tool information

  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0173 02

Upper Left Duct Air Temperature Sensor Circuit Short to Ground

DTC B0173 05

Upper Left Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B0178 02

Lower Left Duct Air Temperature Sensor Circuit Short to Ground

DTC B0178 05

Lower Left Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B0509 02

Upper Right Duct Air Temperature Sensor Circuit Short to Ground

DTC B0509 05

Upper Right Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B0514 02

Lower Right Duct Air Temperature Sensor Circuit Short to Ground

DTC B0514 05

Lower Right Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B0519 02

Rear Upper Duct Air Temperature Sensor Circuit Short to Ground

DTC B0519 05

Rear Upper Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B3583 02

Rear Lower Duct Air Temperature Sensor Circuit Short to Ground

DTC B3583 05

Rear Lower Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B3933 02

Air Conditioning Evaporator Temperature Sensor Circuit Short to Ground

DTC B3933 05

Air Conditioning Evaporator Temperature Sensor Circuit High Voltage/Open

  1. Ignition ON.
  2. The HVAC control module is ON.

The HVAC control module detects the sensor signal out of range. The signal voltage is less than 0.1 V or greater than 4.9 V for more than 50 ms.

The system operates using a default value.

The sensor signal is within specified range between 0.1-4.9 V.

CONTROL MODULE REFERENCES for scan tool information

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.
  2. Test for less than 10 ohms between the temperature sensor ground circuit terminal B and ground.
  3. If greater than the specified value, 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 4.8-5.2 V between the signal circuit terminal A and ground.
  5. If less than the specified range, test the signal 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 signal 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 temperature sensor.
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B018A 02

Windshield Temperature Sensor Circuit Short to Ground

DTC B018A 05

Windshield Temperature Sensor Circuit High Voltage/Open

DTC B048C 02

Humidity Sensor Humidity Circuit Short to Ground

DTC B048C 05

Humidity Sensor Humidity Circuit High Voltage/Open

DTC B048F 02

Humidity Sensor Temperature Circuit Short to Ground

DTC B048F 05

Humidity Sensor Temperature Circuit High Voltage/Open

DTC B1395 03

Control Module Voltage Reference Output Circuit Low Voltage

DTC B1395 07

Control Module Voltage Reference Output Circuit High Voltage

  1. Ignition ON.
  2. The HVAC control module is ON.

B018A 02, B048C 02, B048C 02 or B1395 03

The HVAC control module detects the sensor signal out of range. The signal voltage is less than 0.1 V for more than 50 ms.

B018A 05, B048C 05, B048C 05 or B1395 07

The HVAC control module detects the sensor signal out of range. The signal voltage is greater than 4.9 V for more than 50 ms.

  1. The system will use the last valid values as default.
  2. If no value is read at the time of fault, the HVAC control module uses 60% for humidity.

The condition for setting the DTC is no longer present.

CONTROL MODULE REFERENCES

  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B0193 01

Front Blower Motor Speed Circuit Short to Battery

DTC B0193 06

Front Blower Motor Speed Circuit Low Voltage/Open

  1. Ignition ON.
  2. The HVAC control module is ON.

B0193 01

The voltage at the HVAC control module output to the blower motor control module is always high.

B0193 06

The voltage at the HVAC control module output to the blower motor control module is always low or floating.

The blower motor is inoperative.

The condition for setting the DTC is no longer present.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition OFF, disconnect the X1 harness connector at the K8 Blower Motor Control Module.
  2. Test for less than 5 ohms between the ground circuit X1 terminal 5 and ground.
  3. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the B+ circuit X1 terminal 6 and ground.
  5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. Connect a DMM between the control circuit X1 terminal 3 and B+.
  7. Cycle the blower motor from OFF to HIGH. The voltage should increase while changing between the commanded states.
  8. If voltage remains greater than 11.5 V while changing between the commanded states, test the control circuit for a short to voltage. If the circuit test normal, replace the K33 HVAC Control Module.
  9. If voltage remains less than 1.0 V while changing between the commanded states, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
  10. If voltage is between 1.0-11.5 V and does not increase when changing between the commanded states, replace the K33 HVAC Control Module.
  11. Ignition OFF, connect the X1 harness connector at the K8 Blower Motor Control Module and disconnect the harness connector at the M8 Blower Motor.
  12. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
  13. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K8 Blower Motor Control Module.
  14. Connect a test lamp between the B+ circuit terminal 2 and the control circuit terminal 1.
  15. Turn the blower motor on high speed then to low speed. The test lamp intensity should be bright when in high speed and very dim or off when the blower is on low speed.
  16. If the test lamp intensity does not vary, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the K8 Blower Motor Control Module.
  17. If all circuits test normal, replace the M8 Blower Motor.
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B0208 01

Rear Blower Motor Speed Circuit Short to Battery

DTC B0208 06

Rear Blower Motor Speed Circuit Low Voltage/Open

  1. Ignition ON.
  2. The HVAC control module is ON.

B0208 01

The voltage at the HVAC control module output to the blower motor control module - auxiliary is always high.

B0208 06

The voltage at the HVAC control module output to the blower motor control module - auxiliary is always low or floating.

The blower motor is inoperative.

The condition for setting the DTC is no longer present.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition OFF, disconnect the X1 harness connector at the K8A Blower Motor Control Module.
  2. Test for less than 5 ohms between the ground circuit X1 terminal 4 and ground.
  3. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the B+ circuit X1 terminal 2 and ground.
  5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. Connect a DMM between the control circuit X1 terminal 1 and B+.
  7. Cycle the blower motor from OFF to HIGH. The voltage should increase while changing between the commanded states.
  8. If voltage remains greater than 11.5 V while changing between the commanded states, test the control circuit for a short to voltage. If the circuit test normal, replace the K33 HVAC Control Module.
  9. If voltage remains less than 1.0 V while changing between the commanded states, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
  10. If voltage is between 1.0-11.5 V and does not increase when changing between the commanded states, replace the K33 HVAC Control Module.
  11. Ignition OFF, connect the X1 harness connector at the K8A Blower Motor Control Module and disconnect the harness connector at the M8A Blower Motor.
  12. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal B and ground.
  13. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K8A Blower Motor Control Module.
  14. Connect a test lamp between the B+ circuit terminal B and the control circuit terminal A.
  15. Turn the blower motor on high speed then to low speed. The test lamp intensity should be bright when in high speed and very dim or off when the blower is on low speed.
  16. If the test lamp intensity does not vary, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the K8A Blower Motor Control Module.
  17. If all circuits test normal, replace the M8A Blower Motor.
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B0223 01

Recirculate Position Command 1 Circuit Short to Battery

DTC B0223 06

Recirculate Position Command 1 Circuit Low Voltage/Open

DTC B022A 01

Recirculate Position Command 2 Circuit Short to Battery

DTC B022A 06

Recirculate Position Command 2 Circuit Low Voltage/Open

DTC B0233 01

Air Flow Control Circuit Short to Battery

DTC B0233 06

Air Flow Control Circuit Low Voltage/Open

DTC B023A 02

HVAC Actuators Supply Voltage Short to Ground

DTC B0408 01

Main Temperature Control Circuit Short to Battery

DTC B0408 06

Main Temperature Control Circuit Low Voltage/Open

DTC B0418 01

Right Temperature Control Circuit Short to Battery

DTC B0418 06

Right Temperature Control Circuit Low Voltage/Open

DTC B0428 01

Rear Temperature Control Circuit Short to Battery

DTC B0428 06

Rear Temperature Control Circuit Low Voltage/Open

DTC B3531 01

Rear Air Flow Control Circuit Short to Battery

DTC B3531 06

Rear Air Flow Control Circuit Low Voltage/Open

  1. Ignition ON.
  2. The HVAC control module is ON.

B023A 02

The stepper motors supply output is shorted to ground.

B0223 01, B022A 01, B0233 01, B0408 01, B0418 01, B0428 01 or B3531 01

At least one control output (of four possible outputs) of the appropriate stepper motor is shorted to voltage when motor starts moving. Faults are not detected when motor is already running or target position is already reached.

B0223 06, B022A 06, B0233 06, B0408 06, B0418 06, B0428 06 or B3531 06

At least one control output (of four possible outputs) of the appropriate stepper motor is shorted to ground or open when motor starts moving. Faults are not detected when motor is already running or target position is already reached.

B023A 02

  1. The affected output will be switched off for hardware protection.
  2. All stepper motors are deactivated.

B0223, B022A, B0233, B0408, B0418, B0428 or B3531

  1. The affected output will be switched off for hardware protection.
  2. The affected stepper motor is deactivated.

The condition for setting the DTC is no longer present.

CONTROL MODULE REFERENCES for scan tool information

  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B048D 01

Auxiliary Heater Temperature Command Circuit Short to Battery

DTC B048D 06

Auxiliary Heater Temperature Command Circuit Low Voltage/Open

DTC B048E 00

Auxiliary Heater System Malfunction

  1. Ignition ON.
  2. The HVAC control module is ON.
  3. The electrical auxiliary heater is ON.

B048D 01

The voltage at the HVAC control module output to the electrical auxiliary heater is always high.

B048D 06

The voltage at the HVAC control module output to the electrical auxiliary heater is always low or floating.

B048E 00

The feedback signal of the electrical auxiliary heater does not correspond with the requested PWM signal.

The electrical auxiliary heater is inoperative.

The feedback signal of the electrical auxiliary heater corresponds with the requested PWM signal.

CONTROL MODULE REFERENCES for scan tool information

  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B1020 00

Auxiliary Electronic Control Unit (ECU) Performance

  1. Ignition is ON or in the ACC position.
  2. The system voltage is at least 9.5 V and no more than 15.5 V.
  3. All the above conditions are present for greater than 10 seconds.

The HVAC control module receives an improper status response indicating an internal ECU fault in the radio/HVAC control.

No action is taken.

  1. A current DTC clears when the HVAC control module receives a proper status response message back from the HVAC control assembly.
  2. A history DTC clears after 50 malfunction-free ignition cycles.

Diagnostic Aids

  1. This DTC may be stored as a history DTC without affecting the operation of the radio/HVAC control.
  2. If stored only as a history DTC and not retrieved as a current DTC, do not replace the radio/HVAC control.
  3. If this DTC is retrieved as both a current and history DTC, replace the radio/HVAC control.

CONTROL MODULE REFERENCES for scan tool information

  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3843 02

Outside Air Quality Sensor Circuit Short to Ground

DTC B3843 05

Outside Air Quality Sensor Circuit High Voltage/Open

DTC B3843 08

Outside Air Quality Sensor Circuit Performance - Signal Invalid

  1. Ignition ON.
  2. The HVAC control module is ON.

B3843 02

No PWM is detected and the signal is low.

B3843 05

No PWM is detected and the signal is high.

B3843 08

The Sensor sends a 5% PWM signal indicating an internal sensor short circuit or open circuit.

The automatic recirculation mode is disabled.

The condition for setting the DTC is no longer present.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition OFF, disconnect the harness connector at the B108 Air Quality Sensor.
  2. Test for less than 10 ohms between the ground circuit terminal 2 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, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
  5. If the test lamp does not illuminate, test the ignition circuit for a short to ground or a open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
  6. Verify the scan tool Odor Sensor parameter is greater than 95%.
  7. If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K33 HVAC Control Module.
  8. Install a 3 A fused jumper wire between the following signal circuit terminal 3 and the ground circuit terminal 2. Verify the scan tool Odor Sensor parameter is less than 5%.
  9. If greater than the specified range, test the signal circuit for a short to voltage or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
  10. If all circuits test normal, replace the B108 Air Quality Sensor.
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B393B 04

Air Conditioning Compressor Valve Control Circuit Open

DTC B393B 0B

Air Conditioning Compressor Valve Control Circuit High Current

  1. Ignition ON.
  2. The HVAC control module is ON.

B393B 04

A PWM greater than 10% is send out but no current is read back.

B393B 0B

Measured current is above threshold of 815 mA.

B393B 04

The A/C compressor is disabled.

B393B 0B

  1. The A/C compressor is disabled.
  2. Output will be switched off for hardware protection.

The condition for setting the DTC is no longer present.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition OFF, disconnect the harness connector at the Q46 Air Conditioning Compressor Valve.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
  3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the FRT HVAC Fuse circuit open, test or replace the Q46 Air Conditioning Compressor Valve.
  4. Verify that a test lamp does not illuminate between the B+ circuit terminal 2 and the control circuit terminal 1.
  5. If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K33 HVAC Control Module.
  6. Remove the test lamp.
  7. Command the A/C compressor ON with a scan tool. Verify the scan tool A/C Compressor Refrigerant Solenoid Valve Command parameter is 100%.
  8. If not the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the K33 HVAC Control Module.
  9. If all circuits test normal, test or replace the Q46 Air Conditioning Compressor Valve.

Static Test

  1. Ignition OFF, disconnect the harness connector at the Q46 Air Conditioning Compressor Valve.
  2. Test for 7-15 ohms between B+ circuit terminal 2 and control circuit terminal 1.
  3. If not within the specified range, replace the Q46 Air Conditioning Compressor Valve.
  4. Test for infinite resistance between each terminal and the Q46 Air Conditioning Compressor Valve housing/case.
  5. If not the specified value, replace the Q46 Air Conditioning Compressor Valve.
  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC P0532 00

Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage

DTC P0533 00

Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit High Voltage

Engine is running.

P0532 00

The ECM detects a short to ground or open at the A/C pressure sensor signal circuit.

P0533 00

The ECM detects a short to voltage at the A/C pressure sensor signal circuit.

  1. The A/C compressor is disabled.
  2. The ECM will illuminate the malfunction indicator lamp (MIL).

The condition for setting the DTC is no longer present.

CONTROL MODULE REFERENCES for scan tool information

  1. Ignition OFF, disconnect the harness connector at the B1 A/C Refrigerant Pressure Sensor.
  2. Ignition ON, test for 4.8-5.2V between the 5V reference circuit terminal 2 and ground.
  3. If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace K20 Engine Control Module.
  4. If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  5. Test for 4.8-5.2V between the 5V reference circuit terminal 2 and the low reference circuit terminal 1.
  6. If less than the specified range, test the low reference circuit for an open circuit/high resistance. If the circuit tests normal, replace K20 Engine Control Module.
  7. If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  8. Verify the scan tool A/C High Side Pressure Sensor parameter is less than 0.3V.
  9. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  10. Install a 3A fused jumper wire between the following signal circuit terminal 3 and the 5V reference circuit terminal 2. Verify the scan tool A/C high side pressure sensor parameter is greater than 4.8V.
  11. If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  12. If all circuits test normal, replace the B1 A/C Refrigerant Pressure Sensor.

Visual/Physical Inspection

  1. Inspect for aftermarket devices which may affect the operation of the Steering Wheel Controls System. Refer to «CHECKING AFTERMARKET ACCESSORIES»(ref-652238-S27245169932014082300000) .
  2. Inspect for easily accessible or visible system components for obvious damage or conditions which may cause the symptom.

Symptom List

Refer to HVAC SYSTEM MALFUNCTION in order to diagnose the symptom.

  1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
  2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
  3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

Check the following mechanical fault sources

  1. Air distribution box
  2. Air distribution hoses/air distribution ducts

CONTROL MODULE REFERENCES for scan tool information

More articles — Automatic Climate Control, Acc