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.
Circuit/System Testing
2019 Buick Envision BaseSECTION Circuit/System Testing
IMPORTANT:
When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:
- Passenger seat position sensor
- SDM
- Passenger seat position sensor wiring harness connector
- SDM wiring harness connector
- Ignition OFF, disconnect the harness connector at the passenger seat position sensor.
- Test for less than 10 ohms between low reference circuit terminal 1 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the SDM.
- Ignition ON, test for 4.5 - 5.5 volts between the signal circuit terminal 2 and ground.
- If less that the specified range, test the signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the SDM.
- If greater that the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the SDM.
- If the circuits test normal, test or replace the passenger seat position sensor.
RENDER: 1.0x
NO RELATED
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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.