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 MANUALSCHEVROLET2002MONTE CARLO V6-3.4L VIN EREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULEDESCRIPTION AND OPERATIONBCM FUNCTIONS
2002 Chevrolet Monte Carlo V6-3.4L VIN E
BCM Functions
2002 Chevrolet Monte Carlo V6-3.4L VIN ESECTION BCM Functions
The Body Control Module (BCM) performs multiple body control functions. The BCM can control devices directly connected to its outputs based on input information obtained from two sources:
^ sensors and switches that are directly connected to tire BCM
^ by receiving information from other vehicle systems connected to the class 2 serial data link.
The BCM evaluates this information and controls certain body control systems by commanding outputs on or off
The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link The vehicle system capable of performing a required function will respond to the BCM message.
The BCM controls these functions:
^ Audible warnings refer to Audible Warnings Description and Operation in Instrument Panel, gauges and Console.
^ Interior lighting, refer to Interior Lighting Systems Description and operation in Lighting Systems.
^ Automatic Door locks, refer to Power Door locks Description and Operation in Doors.
^ Automatic headlamp control, refer 10 Exterior Lighting Systems Description and Operation in Lighting Systems.
^ Keyless entry (AUO option), refer to Keyless Entry System Description and Operation in Keyless Entry.
^ Passlock theft deterrent, refer to Vehicle Theft Deterrent (VTD) Description and Operation in Theft Deterrent
^ Content theft deterrent, refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent
^ Retained Accessory Power (RAP) refer to Retained Accessory Power (RAP) Description and Operation in Accessory Delay Module.
^ sensors and switches that are directly connected to tire BCM
^ by receiving information from other vehicle systems connected to the class 2 serial data link.
The BCM evaluates this information and controls certain body control systems by commanding outputs on or off
The BCM is also capable of controlling other vehicle systems that are not directly wired to the BCM. The BCM does this by sending specific messages on the class 2 serial data link The vehicle system capable of performing a required function will respond to the BCM message.
The BCM controls these functions:
^ Audible warnings refer to Audible Warnings Description and Operation in Instrument Panel, gauges and Console.
^ Interior lighting, refer to Interior Lighting Systems Description and operation in Lighting Systems.
^ Automatic Door locks, refer to Power Door locks Description and Operation in Doors.
^ Automatic headlamp control, refer 10 Exterior Lighting Systems Description and Operation in Lighting Systems.
^ Keyless entry (AUO option), refer to Keyless Entry System Description and Operation in Keyless Entry.
^ Passlock theft deterrent, refer to Vehicle Theft Deterrent (VTD) Description and Operation in Theft Deterrent
^ Content theft deterrent, refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent
^ Retained Accessory Power (RAP) refer to Retained Accessory Power (RAP) Description and Operation in Accessory Delay Module.
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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.