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.DB● LIVE
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 RELAY FEEDBACK
1998 GMC Envoy 2WD V6-4.3L VIN W
Headlamp Relay Feedback
1998 GMC Envoy 2WD V6-4.3L VIN WSECTION Headlamp Relay Feedback
Input 2:
Range: ON/ OFF
The BCM uses the headlamp Relay Feedback input in order to determine if the headlamps are ON or OFF by determining if current is present on the headlamp circuit. The BCM monitors CKT 352 in order to determine if the headlamp power relay energizes.
ON displays when the BCM receives a voltage input on the circuit between the headlamp switch and the headlamp power relay coil. The voltage input indicates that the headlamps are ON.
OFF displays when the BCM does not receive a voltage signal on the circuit between the headlamp switch and the headlamp power relay coil. The lack of voltage indicates that the headlamps are OFF.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.