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What the the Body control module do ? On 2002 Silverado

Body control module Function ? on 2002 Silverado 1500

What the the Body control module do ? On 2002 Silverado

Postby griprim12 [OP] » Mar 03 2016, 8:42pm

HI
What does the Body control module do ? function? for 2002 silverado 1500?
Have a problem with parking lights not working . Checked fuse under hood on drivers side 30 Amp and it was good and checked door jamb fuses and all are good and looked for a relay and found none . Replaced light switch in cab which was easy but still no parking lights .???? and checked all park lamp fuses and all are good ? stumped on this one ? have any ideas ???
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Re: What the the Body control module do ? On 2002 Silverado

Postby Fisger8 » Mar 04 2016, 4:55pm

In automotive electronics, body control module is a generic term for an electronic control unit responsible for monitoring and controlling various electronic accessories in a vehicle's body. Typically in a car or truck the BCM controls the power windows, power mirrors, air conditioning, immobilizer system, central locking, etc. The BCM communicates with other on-board computers via the car's vehicle bus, and its main application is controlling load drivers – actuating relays that in turn perform actions in the vehicle such as locking the doors or dimming the overhead lamp.
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Re: What the the Body control module do ? On 2002 Silverado

Postby wildchevy » Mar 04 2016, 5:11pm

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. The BCM evaluates this information and controls certain body control systems by commanding outputs on or off. The BCM control inputs can be:
•Sensors and switches that are directly connected to the BCM
•Class 2 serial data received from other control modules connected to the class 2 serial data link.

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 control module capable of performing the 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
•Automatic door locks, refer to Power Door Locks Description and Operation in Doors
•Automatic headlamp control, refer to Exterior Lighting Systems Description and Operation in Lighting Systems
•Interior lighting, refer to Interior 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.
•Retained Accessory Power (RAP), refer to Retained Accessory Power Description and Operation in Retained Accessory Power

Serial Data Power Mode


On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the Body Control Module (BCM). The BCM receives 2 signals/circuits from the ignition switch. These are the Ignition 1 and Ignition 3 signals/circuits.

To determine the correct power mode the BCM uses:
•The state of these signals/circuits, either switch closed (B+ = 1) or switch open (open = 0)
•The status of the engine run flag.
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