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 MANUALSGMC1998ENVOY 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONSINPUT 2HEADLAMP REQUEST SWITCH
1998 GMC Envoy 2WD V6-4.3L VIN W
Headlamp Request Switch
1998 GMC Envoy 2WD V6-4.3L VIN WSECTION Headlamp Request Switch
Input 2:
Range: ACTIVE/INACTIVE
The BCM uses the headlamp request switch input in order to determine the position of the headlamp switch.
ACTIVE displays when the headlamp switch is in the HEADLAMP position.
INACTIVE displays when the headlamp switch is not in the HEADLAMP position.
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.