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 MANUALSBUICK2019ENVISION BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTINFOTAINMENTACTIVE NOISE CANCELLATIONDIAGNOSTIC INFORMATION AND PROCEDURESDTC B0560CIRCUIT/SYSTEM TESTING

2019 Buick Envision Base

Circuit/System Testing

2019 Buick Envision BaseSECTION Circuit/System Testing

NOTE:

Diagnose any Engine Control Module DTCs before performing this diagnostic.

Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
Engine running at 600 RPM,
Test for 575-800 Hz AC between the signal circuit terminal 2 and ground.
- If not between 575-800 Hz AC
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - Go to next step: If less than 1 V
3. Ignition OFF.
4. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
5. Test for less than 2 Ω in the signal circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K20 Engine Control Module.
- Go to next step: If between 575-800 Hz AC
Test or replace the T3 Audio Amplifier.

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.