Envoy 2WD V6-4.3L VIN W (1998)
Vehicle Control Module: Service Precautions
Aftermarket (Add-on) Electrical and Vacuum Equipment
Aftermarket (add-on) electrical and vacuum equipment is any device installed on to a vehicle after the vehicle has left the factory that connects to the
electrical circuits or vacuum hoses of the vehicle.
IMPORTANT NOTES:
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Do not attach add-on vacuum operated equipment to this vehicle. The use of add-on vacuum equipment may result in damage to vehicle
components or systems.
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Connect any add-on electrically operated equipment to the vehicle's electrical system at the battery (power and ground) in order to prevent damage
to the vehicle.
Add-on electrical equipment installed as instructed can cause the system to malfunction. Add-on electrical equipment not connected to the vehicle
electrical circuits can cause the system to malfunction. Examples of these types of equipment include the following:
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Portable telephones
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Portable radios
Eliminate all add-on equipment in order to diagnose a malfunction.
