• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Active Grille Air Shutter Description and Operation

• Ignition » On / Vehicle » In Service Mode
• Ambient temperature above 8°C (46°F).

Desired Active Grille Air Shutter Position¿Desired Active Grille Air Shutter Position Achieved—Exceeded Number of Attempts

LIN Bus Communication Malfunction

DTCs listed in the DTC Descriptor category=Type B DTC

DTCs listed in the DTC Descriptor category=Type B DTC

Active Grille Air Shutter Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Verify none of the following conditions are present:
• Snow or ice packed in the front fascia which prevents the louvers from moving.
• Debris or foreign objects which prevent the louvers from moving.
• If any of the conditions are present

  Clear any snow, ice or foreign objects from the front grille.

• If none of the conditions are present
2. Ignition On/Vehicle in Service Mode.
3. Verify no other DTCs are set, except P059F or P151E.
• If any other DTCs are set

  Refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

• If no other DTCs are set

  Refer to Circuit/System Testing.

4. If no DTCs are set a fault is currently not present and there may be an intermittent condition.

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:M60A Active Grille Air Shutter 1 Motor Module/M96A Active Grille Air Shutter 1 Actuator.
3. { If equipped }Disconnect the electrical connector:M60B Active Grille Air Shutter 2 Motor Module/M96B Active Grille Air Shutter 2 Actuator.
4. Test for less than 10 Ω between the test points:Ground circuit terminal@Active Grille Air Shutter Actuator&Ground
• If 10 Ω or greater
1. Disconnect the ground connection:Ground circuit terminal
2. Test for less than 2 Ω between the test points:Ground circuit terminal@Component harness&Ground circuit terminal
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Repair the open/high resistance in the ground connection.
• If less than 10 Ω
5. Ignition » On / Vehicle » In Service Mode
6. Verify a test lamp turns On between the test points:Ignition circuit@Component harness&Ground
• If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Test for less than 2 Ω between the test points:Ignition circuit@Component harness&Output terminal@M96 Fuse
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse.

  Or

• If less than 2 Ω » Refer to:Power Mode Mismatch
• If the test lamp does not turn On and the circuit fuse is open
1. Ignition/Vehicle » Off & Remove » Test lamp
2. Test for infinite resistance between the test points:Ignition circuit@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance » Replace the component:M60A Active Grille Air Shutter 1 Motor Module/M96A Active Grille Air Shutter 1 Actuator.
• If the test lamp turns On
7. Ignition/Vehicle OFF, disconnect all LIN devices that share the same LIN serial data circuit.
8. Ignition ON/Vehicle In Service Mode.

Note: For accurate voltage reading, disconnect the battery charger prior to performing the following test step.

9. Test for 3.5-12 V between the LIN serial data circuit terminal and ground.
• If less than 3.5 V
1. Ignition/Vehicle OFF, disconnect the harness connectors at the K20 Engine Control Module.
2. Test for infinite resistance between the LIN serial data circuit terminal and ground.
• If less than infinite resistance, repair the short to ground in the circuit.
• If infinite resistance
3. Test for less than 2 Ω in the LIN serial data circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω
4. Replace the K20 Engine Control Module.
• If greater than 12 V
1. Ignition/Vehicle OFF, disconnect the harness connectors at the K20 Engine Control Module.
2. Ignition ON/Vehicle In Service Mode.
3. Test for less than 1 V between the LIN serial data circuit terminal and ground.
• If 1 V or greater, repair the short to voltage in the circuit.
• If less than 1 V
4. Replace the K20 Engine Control Module.
• If between 3.5-12 V
10. Verify how many LIN devices are connected to this LIN circuit.
• If there is only one LIN device
1. Ignition/Vehicle OFF, inspect both harness and component connectors for contamination, corrosion, and terminal tension.
2. Reconnect the harness connectors at the LIN device. Verify all connectors/terminals are fully seated.
3. Ignition ON/Vehicle In Service Mode.
4. Verify the DTC is not set again.
• If the DTC is set, replace the LIN device that is not communicating.
• If the DTC is not set
5. A fault is currently not present and may be an intermittent condition.
• If there are two or more LIN devices
11. Ignition/Vehicle OFF, disconnect the harness connectors at the K20 Engine Control Module.
12. Reconnect the harness connectors at the first LIN device.
13. Ignition ON/Vehicle In Service Mode.
14. Test for 3.5-12 V between the LIN serial data circuit terminal at the K20 Engine Control Module and ground.
• If less than 3.5 V or greater than 12 V

  Replace the LIN device that was just connected.

• If between 3.5-12 V
15. Ignition/Vehicle OFF, reconnect the harness connectors at another LIN device.
16. Ignition ON/Vehicle In Service Mode.
17. Test for 3.5-12 V between the LIN serial data circuit terminal at the K20 Engine Control Module and ground.
• If less than 3.5 V or greater than 12 V

  Replace the LIN device that was just connected.

• If between 3.5-12 V
18. Repeat steps 15-17 for the remaining LIN devices until a faulty LIN device is identified. If there is no faulty LIN device, replace the M60A Active Grille Air Shutter 1 Motor Module/M96A Active Grille Air Shutter 1 Actuator.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

For control module replacement, programming, and setup refer to:Control Module References