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 MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULEDESCRIPTION AND OPERATIONBODY CONTROL SYSTEM CIRCUIT DESCRIPTIONBATTERY RUNDOWN PROTECTION
1998 GMC Envoy 2WD V6-4.3L VIN W
Battery Rundown Protection
1998 GMC Envoy 2WD V6-4.3L VIN WSECTION Battery Rundown Protection
The battery run down protection provides protection against the following conditions:
^ Parasitic loads
^ Excessive battery drain
^ High current loads that are related to the courtesy lamp circuit
The battery run down protection will also protect the battery against being run down from the courtesy lamp circuit to a level that will prevent the vehicle from starting. The BCM will turn OFF the courtesy lamp circuit when the following actions occur:
^ The ignition switch is turned from the RUN position to the OFF position.
^ 20 minutes elapses without a lamp request input.
Complete one of the following actions in order to return the BCM to normal operation when the battery run down protection turns OFF the interior lamps:
^ Turn OFF all of the lamps and close all of the doors.
^ Turn the ignition switch from the OFF position to the ON position.
^ Parasitic loads
^ Excessive battery drain
^ High current loads that are related to the courtesy lamp circuit
The battery run down protection will also protect the battery against being run down from the courtesy lamp circuit to a level that will prevent the vehicle from starting. The BCM will turn OFF the courtesy lamp circuit when the following actions occur:
^ The ignition switch is turned from the RUN position to the OFF position.
^ 20 minutes elapses without a lamp request input.
Complete one of the following actions in order to return the BCM to normal operation when the battery run down protection turns OFF the interior lamps:
^ Turn OFF all of the lamps and close all of the doors.
^ Turn the ignition switch from the OFF position to the ON position.
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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.