C1930 Air Suspension Front Compressor Relay Circuit Open

Definition

Common causes

• Faulty air suspension compressor relay
• Open circuit in the relay wiring
• Blown fuse in the air suspension system
• Faulty air suspension compressor
• Poor ground connection
• Damaged or corroded connectors
• Faulty control module or sensor issues

Common misdiagnoses

• Faulty air suspension compressor
• Bad air suspension relay
• Damaged wiring or connectors
• Faulty air suspension control module
• Low air suspension fluid or leaks
• Incorrectly calibrated height sensors
• Battery or charging system issues

Troubleshooting steps

1. 1. Check the Vehicle's Manual

   Refer to the vehicle's service manual for specific information regarding the air suspension system and the relay circuit

2. 2. Visual Inspection

   Wiring and Connectors: Inspect the wiring harness and connectors related to the air suspension compressor and relay for any signs of damage, corrosion, or loose connections

3. 3. Relay Condition

   Check the relay itself for any physical damage or signs of overheating

4. 4. Test the Relay

   Relay Functionality: Swap the air suspension relay with another relay of the same type in the fuse box (if applicable) to see if the problem persists

5. 5. Bench Test

   If possible, bench test the relay to ensure it operates correctly

6. 6. Check Fuses

   Inspect the fuses related to the air suspension system. Replace any blown fuses and check if the code returns

7. 7. Measure Voltage and Ground

   Power Supply: Use a multimeter to check for voltage at the relay socket when the ignition is on. Ensure that the relay is receiving power

8. 8. Ground Connection

   Check the ground connection for the relay and the compressor. A poor ground can cause the circuit to be open

9. 9. Inspect the Air Suspension Compressor

   Check the air suspension compressor for proper operation. If the compressor is faulty, it may not draw power, leading to an open circuit condition

10. 10. Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

11. 11. Check for Short Circuits

    Inspect the wiring for any short circuits that could affect the relay circuit. Look for frayed wires or areas where the insulation may be damaged

12. 12. Test the Control Module

    If all else checks out, the issue may lie within the air suspension control module. Testing or replacing the module may be necessary

13. 13. Clear Codes and Test Drive

    After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.1

14. 14. Consult a Professional

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who specializes in air suspension systems. By following these steps, you should be able to identify the cause of the C1930 code and take appropriate action to resolve the issue