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.
SYS.OK|MANUAL.DBβ LIVE
HOMESERVICE MANUALSBUICK2013REGAL TURBO PREMIUM, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 76 (HVAC SYSTEM - AUTOMATIC)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B393BCIRCUIT/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 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the Q46 Air Conditioning Compressor Valve.
- Ignition ON, test for greater than 11 V between the B+ circuit terminal B and ground.
- If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance.
- Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module.
- Ignition ON, test for less than 0.3 V between the control circuit terminal 10 X2 and ground.
- If greater than the specified range, test the control circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the control circuit terminal 10 X2 and ground.
- If less than the specified range, test the control circuit for a short to ground.
- Test for less than 5 Ξ© 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
- If greater than the specified value, test the control circuit for an open/high resistance.
- If all circuits test normal, test or replace the Q46 Air Conditioning Compressor Valve.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.