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.
High Beam Switch
1998 GMC Envoy 2WD V6-4.3L VIN WSECTION High Beam Switch
Input 2:
Range: ON/ OFF
The BCM uses the high beam switch input in order to determine if the high beam headlamps are ON by measuring the voltage on CKT 524 between the following components:
^ Both of the high beam headlamps
^ The high/low beam selector switch
^ The flash to pass switch
RENDER: 1.0x
NO RELATED
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.