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

Preferred Method (with Scan Tool)

1. 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. 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 it is performing self-calibration. Interruption could cause the HVAC system to malfunction. 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.

AUTOMATIC CLIMATE CONTROL, ACC DTC INDEX

Diagnostic Instructions

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC Descriptors

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

Diagnostic Fault Information

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 minutes.

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-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

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 5 ohms between the temperature sensor ground circuit terminal B 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 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 and verify the DTC does not reset.
8. If the DTC resets, replace the K33 HVAC Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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 X2 harness connector at the K8 Blower Motor Control Module.
2. Verify that a test lamp illuminates between the B+ and ground circuit terminal 5 X2.
3. If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 X2 at the K8 Blower Motor Control Module harness connector 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. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module.
7. Ignition ON, test for less than 0.3 V between the control circuit terminal 3 X2 at the K8 Blower Motor Control Module harness connector and ground.
8. If greater than the specified range, test the control circuit for a short to voltage.
9. Ignition OFF, test for infinite resistance between the control circuit terminal 3 X2 at the K8 Blower Motor Control Module harness connector and ground.
10. If less than the specified range, test the control circuit for a short to ground.
11. Test for less than 5 ohms between the K33 HVAC Control Module control circuit terminal 15 X2 and control circuit terminal 3 X2 at the K8 Blower Motor Control Module harness connector.
12. If greater than the specified value, test the control circuit for an open/high resistance.
13. If all circuits test normal, replace the K8 Blower Motor Control Module and verify the DTC does not reset.
14. If the DTC resets, replace the K33 HVAC Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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 X2 harness connector at the K33 HVAC Control Module and the X1 harness connector at the K8A Blower Motor Control Module - Auxiliary.
2. Verify that a test lamp illuminates between the K8A Blower Motor Control Module - Auxiliary ground circuit terminal 4 X1 and B+.
3. If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 X1 at the K8A Blower Motor Control Module - Auxiliary harness connector 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. Test for less than 0.3 V between the control circuit terminal 1 X1 at the K8A Blower Motor Control Module - Auxiliary harness connector and ground.
7. If greater than the specified value, test the control circuit for a short to voltage.
8. Ignition OFF, test for infinite resistance between the control circuit terminal 1 X1 at the K8A Blower Motor Control Module - Auxiliary harness connector and ground.
9. If less than the specified value, test the control circuit for a short to ground.
10. Test for less than 5 ohms between the K33 HVAC Control Module control circuit terminal 16 X2 and control circuit terminal 1 X1 at the K8A Blower Motor Control Module - Auxiliary harness connector.
11. If greater than the specified value, test the control circuit for an open/high resistance.
12. If all circuits test normal, replace the K8A Blower Motor Control Module - Auxiliary and verify the DTC does not reset.
13. If the DTC resets, replace the K33 HVAC Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

Air Flow Control Rear Circuit Short to Battery

DTC B3531 06

Air Flow Control Rear 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-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC Descriptor

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 5 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.
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.
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-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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, test for greater than 11 V between the B+ circuit terminal B and ground.
3. If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module.
5. Ignition ON, test for less than 0.3 V between the control circuit terminal 10 X2 and ground.
6. If greater than the specified range, test the control circuit for a short to voltage.
7. Ignition OFF, test for infinite resistance between the control circuit terminal 10 X2 and ground.
8. If less than the specified range, test the control circuit for a short to ground.
9. Test for less than 5 ohms between the Q46 Air Conditioning Compressor Valve control circuit terminal A and control circuit terminal 10 X2 at the K33 HVAC Control Module harness connector
10. If greater than the specified value, test the control circuit for an open/high resistance.
11. If all circuits test normal, test or replace the Q46 Air Conditioning Compressor Valve and verify the DTC does not reset.
12. If the DTC resets, replace the K33 HVAC Control Module.

Static Test

1. Ignition OFF, disconnect the harness connector at the Q46 Air Conditioning Compressor Valve.
2. Test for 7-15 ohms between control circuit terminal A and B+ circuit terminal B.
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-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

The 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 the 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 the value is less than the specified range, test the low reference circuit for an open circuit/high resistance. If the circuit tests normal, replace the 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.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC P0645

Air Conditioning (A/C) Compressor Clutch Relay Control Circuit

DTC P0646

Air Conditioning (A/C) Compressor Clutch Relay Control Circuit Low Voltage

DTC P0647

Air Conditioning (A/C) Compressor Clutch Relay Control Circuit High Voltage

1. The engine is running.
2. The HVAC control module is ON.
3. The A/C switch is active.

P0645 or P0646

The ECM detects a short to ground or an open at the A/C compressor clutch relay control circuit.

P0647

The ECM detects a short to voltage at the A/C compressor clutch relay control circuit.

P0645 or P0646

The A/C compressor is inoperative or always active.

P0647

The A/C compressor is inoperative.

The condition for setting the DTC is no longer present.

CONTROL MODULE REFERENCES or scan tool information

1. Ignition OFF, remove the KR29 A/C Compressor Clutch Relay.
2. Ignition ON, test for greater than 11 V between the ignition circuit terminal 86 at the KR29 A/C Compressor Clutch Relay and ground.
3. If less than the specified range, replace the X50A Fuse Block - Underhood.
4. Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module.
5. Ignition ON, test for less than 0.3 V between the control circuit terminal 85 at the KR29 A/C Compressor Clutch Relay and ground.
6. If greater than the specified range, test the control circuit for a short to voltage. If the circuit test normal, replace the X50A Fuse Block - Underhood.
7. Ignition OFF, test for infinite resistance between the control circuit terminal 85 at the KR29 A/C Compressor Clutch Relay and ground.
8. If less than the specified range, test the control circuit for a short to ground. If the circuit test normal, replace the X50A Fuse Block - Underhood.
9. Test for less than 5 ohms between the KR29 A/C Compressor Clutch Relay control circuit terminal 85 and the control circuit terminal 11 X1 at the K20 Engine Control Module harness connector.
10. If greater than the specified value, test the control circuit for an open/high resistance. If the circuit test normal, replace the X50A Fuse Block - Underhood.
11. If all circuits test normal, test or replace the KR29 A/C Compressor Clutch Relay and verify the DTC does not reset.
12. If the DTC resets, replace the K20 Engine Control Module.

1. Ignition OFF, disconnect the KR29 A/C Compressor Clutch Relay.
2. Test for 60-180 ohms between the B+ terminal 85 and the control terminal 86 of the KR29 A/C Compressor Clutch Relay.
3. If not within the specified range, replace the KR29 A/C Compressor Clutch Relay.
4. Test for the resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87
5. If not the specified value, replace the KR29 A/C Compressor Clutch Relay.

Visual/Physical Inspection

1. Inspect for aftermarket devices which may affect the operation of the HVAC System. Refer to «CHECKING AFTERMARKET ACCESSORIES»(ref-653659-S25218301212014090100000) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
3. Verify the A/C compressor turns freely and is not seized.
4. Verify that the customer is using the correct key to enable personalization and is not inadvertently activating auxiliary HVAC controls.
5. The A/C compressor will not operate in cold outside air temperatures.
6. The following conditions may cause window fogging: Wet carpet or mats High humidity Interior water leak Blocked A/C evaporator drain tube Maximum passenger capacity Blocked body pressure relief valves
7. Inspect the air distribution system for causes of reduced air flow: Obstructed or dirty passenger compartment air filter, if equipped Blocked or damaged air inlet or outlet vents

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «AIR CONDITIONING COMPRESSOR MALFUNCTION (LAU, LBR, LBS, LDK, OR LHU)»(ref-653671-S07871596382014090100000) or «AIR CONDITIONING COMPRESSOR MALFUNCTION (LLU)»(ref-653671-S41738334052014090100000)
2. «BLOWER MOTOR MALFUNCTION»(ref-653671-S14278637322014090100000)
3. «AIR TEMPERATURE MALFUNCTION»(ref-653671-S31698112272014090100000)
4. «AIR DELIVERY IMPROPER»(ref-653671-S11504501302014090100000)
5. «AIR RECIRCULATION MALFUNCTION»(ref-653671-S34355013872014090100000)
6. «AUXILIARY BLOWER MOTOR MALFUNCTION»(ref-653671-S32470830672014090100000)
7. «AUXILIARY AIR TEMPERATURE MALFUNCTION»(ref-653671-S26865733022014090100000)
8. «AIR DELIVERY IMPROPER - AUXILIARY»(ref-653671-S18057195352014090100000)

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

Diagnostic Aids

The following conditions must be met in order for the HVAC control module to turn on the A/C compressor

1. Battery voltage is between 9-18 V.
2. Engine coolant temperature is less than 124°C (255°F).
3. Engine speed is greater than 600 rpm.
4. Engine speed is less than 5 500 rpm.
5. A/C high side pressure is between 269-2, 929 kPa (39-425 psi).
6. Throttle position is less than 100%.
7. Evaporator temperature is greater than 3°C (38°F).
8. ECM does not detect immoderate torque load.
9. ECM does not detect insufficient idle quality.
10. The ambient temperature is above 1°C (34°F).

CONTROL MODULE REFERENCES for scan tool information

Note. Before executing Circuit/System Testing, all conditions shown in Diagnostic Aids must be met.

1. Ignition ON, press and release the POWER switch. Verify the scan tool Front HVAC System Status parameter changes between Off and On.
2. If not the specified value, replace the A20 Radio/HVAC Controls.
3. Ignition ON, press and release the A/C Switch. Verify the scan tool A/C Switch parameter changes between Active and Inactive.
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.
7. If all circuits test normal, replace the K33 HVAC Control Module and verify the Q46 Air Conditioning Compressor Valve can be activated and deactivated. If the Q46 Air Conditioning Compressor Valve cannot be activated or deactivated, replace the Q46 Air Conditioning Compressor Valve.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

The following conditions must be met in order for the ECM to turn on the A/C compressor clutch

1. Battery voltage is between 9-18 V.
2. Engine coolant temperature is less than 124°C (255°F).
3. Engine speed is greater than 600 rpm.
4. Engine speed is less than 5 500 rpm.
5. A/C high side pressure is between 269-2 929 kPa (39-425 PSI).
6. Throttle position is less than 100%.
7. Evaporator temperature is greater than 3°C (38°F).
8. ECM does not detect immoderate torque load.
9. ECM does not detect insufficient idle quality.
10. The ambient temperature is above 1°C (34°F).

CONTROL MODULE REFERENCES for scan tool information

Note. Before executing Circuit/System Testing, all conditions shown in Diagnostic Aids must be met.

1. Ignition ON, activate and deactivate the A/C switch. Verify the scan tool A/C Switch parameter changes between Active and Inactive.
2. If not the specified value, replace the A20 Radio/HVAC Controls.
3. Activate and deactivate the A/C switch. Verify the engine control module (ECM) scan tool A/C Request Signal parameter changes between Active and Inactive.
4. If not the specified value, replace the K33 HVAC Control Module.
5. Ignition OFF, remove the KR29 A/C Compressor Clutch Relay.
6. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
7. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the X50A Fuse Block - Underhood.
8. Verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
9. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit test normal, replace the X50A Fuse Block - Underhood.
10. Ignition OFF, disconnect the harness connector at the Q2 A/C Compressor Clutch.
11. Test for less than 5 ohms between the Q2 A/C Compressor Clutch ground circuit terminal A and ground.
12. If greater than the specified range, test the ground circuit for an open/high resistance.
13. Connect the harness connector at the Q2 A/C Compressor Clutch.
14. Ignition ON, connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the Q2 A/C Compressor Clutch is activated.
15. If the Q2 A/C Compressor Clutch does not activate, test the control circuit for an open/high resistance. If the circuit test normal, replace the Q2 A/C Compressor Clutch.
16. Connect a test lamp between the ignition circuit terminal 86 and the control circuit terminal 85.
17. Command the engine control module (ECM) A/C Compressor Clutch Relay output function ON and OFF with the scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
18. If the test lamp always illuminates or always does not illuminate, replace the K20 Engine Control Module.
19. If all circuits test normal, replace the KR29 A/C Compressor Clutch Relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

1. Ignition OFF, disconnect the X2 harness connector at the K8 Blower Motor Control Module.
2. Verify that a test lamp illuminates between the B+ and ground circuit terminal 5 X2.
3. If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 X2 at the K8 Blower Motor Control Module harness connector 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. Ignition OFF, disconnect the harness connector at the M8 Blower Motor and connect the X1 harness connector at the K8 Blower Motor Control Module.
7. Ignition ON, verify that a test lamp illuminates between the M8 Blower Motor B+ circuit terminal 2 and ground.
8. 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.
9. Connect a test lamp between the M8 Blower Motor B+ circuit terminal 2 and the M8 Blower Motor control circuit terminal 1.
10. Turn the blower motor OFF. Verify the test lamp does not illuminate.
11. If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K8 Blower Motor Control Module and verify that the test lamp does not always illuminate. If the test lamp always illuminates, replace the K33 HVAC Control Module.
12. Turn the blower motor stepwise from low speed to high speed. The test lamp intensity should increase.
13. If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K8 Blower Motor Control Module and verify that the test lamp illuminates. If the test lamp does not illuminate, replace the K33 HVAC Control Module.
14. If the test lamp intensity does not vary, replace the K8 Blower Motor Control Module and verify that the intensity varies. If the test lamp intensity does not vary, replace the K33 HVAC Control Module.
15. If all circuits test normal, replace the K8 Blower Motor Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

1. Ignition OFF, disconnect the X1 harness connector at the K8A Blower Motor Control Module - Auxiliary.
2. Verify that a test lamp illuminates between the K8A Blower Motor Control Module - Auxiliary ground circuit terminal 4 X1 and B+.
3. If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the K8A Blower Motor Control Module - Auxiliary B+ circuit terminal 2 X1 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. Ignition OFF, disconnect the harness connector at the M8B Blower Motor - Auxiliary and connect the X1 harness connector at the K8A Blower Motor Control Module - Auxiliary.
7. Ignition ON, verify that a test lamp illuminates between the M8B Blower Motor - Auxiliary B+ circuit terminal B and ground.
8. 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 - Auxiliary.
9. Connect a test lamp between the M8B Blower Motor - Auxiliary B+ circuit terminal B and the M8B Blower Motor - Auxiliary control circuit terminal A.
10. Turn the blower motor OFF. Verify the test lamp does not illuminate.
11. If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K8A Blower Motor Control Module - Auxiliary and verify that the test lamp does not always illuminate. If the test lamp always illuminates, replace the K33 HVAC Control Module.
12. Turn the blower motor stepwise from low speed then to high speed. The test lamp intensity should increase.
13. If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K8A Blower Motor Control Module - Auxiliary and verify that the test lamp illuminates. If the test lamp does not illuminate, replace the K33 HVAC Control Module.
14. If the test lamp intensity does not vary, replace the K8A Blower Motor Control Module - Auxiliary and verify that the intensity varies. If the test lamp intensity does not vary, replace the K33 HVAC Control Module.
15. If all circuits test normal, replace the M8B Blower Motor - Auxiliary.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

1. Ignition ON, turn the left temperature knob in all positions. Verify the scan tool Left Temperature Knob Position parameter. The reading should correspond to the selected temperature.
2. If not the specified value, replace the A20 Radio/HVAC Controls.
3. Ignition ON, turn the right temperature knob in all positions. Verify the scan tool Right Temperature Knob Position parameter. The reading should correspond to the selected temperature.
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.
7. Press and release the ZONE Switch. Verify the scan tool MULTI-ZONE Switch parameter changes between Active and Inactive.
8. If not the specified value, replace the A20 Radio/HVAC Controls.
9. Verify the M6L Air Temperature Door Actuator - Left can be put into all positions.
10. If the M6L Air Temperature Door Actuator - Left cannot be put into all positions, replace the M6L Air Temperature Door Actuator - Left and verify the M6L Air Temperature Door Actuator - Left can be put into all positions. If the M6L Air Temperature Door Actuator - Left cannot be put into all positions, replace the K33 HVAC Control Module.
11. If all circuits test normal, replace the M6R Air Temperature Door Actuator - Right and verify the M6R Air Temperature Door Actuator - Right can be put into all positions. If the M6R Air Temperature Door Actuator - Right cannot be put into all positions, replace the K33 HVAC Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

1. Ignition ON, press and release the rear temperature increase switch. Verify the scan tool Rear Temperature Setting parameter. The reading should correspond to the selected temperature.
2. If not the specified value, replace the A21 Radio/HVAC Controls - Auxiliary.
3. Press and release the rear temperature decrease switch. Verify the scan tool Rear Temperature Setting parameter. The reading should correspond to the selected temperature.
4. If not the specified value, replace the A21 Radio/HVAC Controls - Auxiliary.
5. Press and release the ZONE Switch. Verify the scan tool MULTIZONE Switch parameter changes between Active and Inactive.
6. If not the specified value, replace the A20 Radio/HVAC Controls.
7. If all circuits test normal, replace the M6B Air Temperature Door Actuator - Auxiliary and verify the M6B Air Temperature Door Actuator - Auxiliary can be put into all positions. If the M6B Air Temperature Door Actuator - Auxiliary cannot be put into all positions, replace the K33 HVAC Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

1. Ignition ON, press and release the switch for air distribution to head. Verify the scan tool Front Defrost Switch parameter changes between Active and Inactive.
2. If not the specified value, replace the A20 Radio/HVAC Controls.
3. Press and release the switch for air distribution to face. Verify the scan tool Instrument Panel Vents switch parameter changes between Active and Inactive.
4. If not the specified value, replace the A20 Radio/HVAC Controls.
5. Press and release the switch for air distribution to floor. Verify the scan tool Floor Mode Switch parameter changes between Active and Inactive.
6. If not the specified value, replace the A20 Radio/HVAC Controls.
7. Press and release the defrost switch. Verify the scan tool Enhanced Defrost Switch parameter changes between Active and Inactive.
8. If not the specified value, replace the A20 Radio/HVAC Controls.
9. If all circuits test normal, replace the M37 Mode Door Actuator and verify the M37 Mode Door Actuator can be put into all positions. If the M37 Mode Door Actuator cannot be put into all positions, replace the K33 HVAC Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

1. Ignition ON, press and release the rear mode switch. Verify the scan tool Auxiliary Mode Switch Position parameter. The reading should correspond to the selected mode.
2. If not the specified value, replace the A21 Radio/HVAC Controls - Auxiliary.
3. If all circuits test normal, replace the M37B Mode Door Actuator - Auxiliary and verify the M37B Mode Door Actuator - Auxiliary can be put into all positions. If the M37B Mode Door Actuator - Auxiliary cannot be put into all positions, replace the K33 HVAC Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) 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

1. Ignition ON, press and release the defrost switch. Verify the scan tool Enhanced Defrost Switch parameter changes between Active and Inactive.
2. If not the specified value, replace the A20 Radio/HVAC Controls.
3. Press and release the recirculation switch. Verify the scan tool Air Recirculation Mode Switch parameter changes between Active and Inactive.
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.
7. Verify the M46 Air Recirculation Door Motor can be put into all positions.
8. If the M46 Air Recirculation Door Motor cannot be put into all positions, replace the M46 Air Recirculation Door Motor and verify the M46 Air Recirculation Door Motor can be put into all positions. If the M46 Air Recirculation Door Motor cannot be put into all positions, replace the K33 HVAC Control Module.
9. If all circuits test normal, replace the M4 Air Inlet Actuator and verify the M4 Air Inlet Actuator can be put into all positions. If the M4 Air Inlet Actuator cannot be put into all positions, replace the K33 HVAC Control Module.