Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK2013REGAL TURBO PREMIUM, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 230 (HVAC SYSTEM - MANUAL)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B393B: AIR CONDITIONING COMPRESSOR VALVE CONTROL CIRCUITCIRCUIT/SYSTEM TESTING
2013 Buick Regal Turbo Premium, Standard Trans
Circuit/System Testing
2013 Buick Regal Turbo Premium, Standard TransSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the Q46 A/C compressor solenoid valve. It may take up to 2 minutes for all vehicle systems to power down
- Verify a test lamp illuminates between the B+ circuit terminal 2 and ground
- Test for infinite resistance between the B+ circuit and ground
- If less than infinite resistance, repair the short to ground on the circuit
- If infinite resistance
- Test for less than 2Ω in the B+ circuit end to end
- If 2Ω or greater, repair the open/high resistance in the circuit
- If less than 2Ω, replace the K33 HVAC control module
If the test lamp does not illuminate
If the test lamp illuminates
- Test for infinite resistance between the B+ circuit and ground
- Ignition ON, connect a test lamp between the control circuit terminal 1 and the B+ circuit terminal 2
- Verify the test lamp turns ON and OFF when commanding the A/C Compressor Refrigerant Solenoid Valve ON and OFF with a scan tool
- Ignition OFF, disconnect the harness connector at the K33 HVAC control module, ignition ON
- Test for less than 1 V between the control circuit and ground
- If 1 V or greater, repair the short to voltage on the circuit
- If less than 1 V
- Ignition OFF
- Test for less than 2Ω in the control circuit end to end
- If 2Ω or greater, repair the open/high resistance in the circuit
- If less than 2Ω, replace the K33 HVAC control module.
If the test lamp is always OFF
If the test lamp is always ON
- 1 Ignition OFF, disconnect the harness connector at the K33 HVAC control module
- 2
Test for infinite resistance between the control circuit and ground
- If less than infinite resistance, repair the short to ground on the circuit
- If infinite resistance, replace the K33 HVAC control module
If the test lamp is always OFF
- Test or replace the Q46 A/C compressor solenoid valve
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.