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B C M

WHAT IS A BCM

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  • A B.C.M. is................
    A body control module is a computer component in an automobile that checks, regulates and operates electronic devices throughout the car. When electric devices first began being used in cars and trucks, each device was governed by a separate electric component. There was a module for the air-conditioning, a module for the interior lighting, a module for the door locks, and so forth. A body control module gathers all these separate modules under one system so that they function together instead of separately, a format easier to both manufacture and troubleshoot.
  • While there are many different types of body control modules, they are generally alike, connecting sensors, switches and automatic reactions together in one computer system. These components are divided into inputs, such as sensor data about heat or speed, and outputs, or ways in which the body control module computer responds to control the vehicle's electronic functions. Inputs and outputs are further divided into analog and digital types of information--analog signals being used with modules that may change continuously (such as oil pressure) and digital signals being used for modules that can simply be on or off (like the headlights or the oil indication light).
Inputs and Outputs
  • Input components are divided into electric parts, such as the potentiometer, the variable resistor, the magnetic pickup and the voltage generator. A potentiometer is designed to change a voltage output to the computer, so that when a fuel setting or gas-pedal position is changed, the voltage will change and the computer will read the new voltage and respond accordingly. The variable resistor works in a similar fashion, but senses changes in temperature for reading engine coolant conditions and other data. The magnetic pickup reads the speed of a rotating object via a simple magnet attached to the object, and a voltage generator sends out a voltage signal based on the presence of compounds like oxygen so the computer can tell the oxygen-rich levels of a pipe or space.
    Output devices consist of relays, solenoids, servomotors, switching transistors and others. Relays can turn other devices on and off by connecting or disrupting a circuit to turn on a fan or automatic air conditioning unit. Solenoids are analog components that use magnetic forces to move objects, such as fuel injectors. A servometer is a mini-motor also used to move objects, usually to turn things, while a switching transistor is the digital version of a relay. Other output devices can be very simple, such as LED lights, or very complex, such as a night-vision view of the road.
Computer Tasks
  • The body control module computer performs many of the functions of a normal computer, including storing data, using RAM and sending or receiving radio waves. The computer regulates many of the systems and troubleshoots all its component modules. Some modules are set by timer, which the computer digitally keeps track of, while other modules--like the anti-theft alarm--need to be active even when the car is turned off. The body control module computer also can be in charge of keeping track of mileage and CO2 output.
    When troubleshooting, a mechanic often is pointed to the right area by the body control module system, which sends out a code that shows what module is not responding. At times, the body control module computer can diagnose itself and report specific problems.

Posted on Oct 27, 2012

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How to replace BCM on Saturn 2003 L200


You take it to the dealer ! Need's to be programmed .

Body Control Module (BCM) Programming/RPO Configuration

The body control module (BCM) must be programmed with the proper RPO configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes, the BCM will not control all of the features properly. Ensure that the following conditions exist in order to prepare for BCM programming:
• The battery is fully charged.
• The ignition switch is in the ON position.
• The data link connector (DLC) is accessible.
• All disconnected modules and devices are reconnected before programming.
To setup a new BCM, use the Tech 2 in conjunction with the Saturn Service Stall System . Refer to Service Programming System (SPS) in Programming.
If the BCM fails to accept the program, perform the following steps:
• Inspect all BCM connections.
• Verify that the scan tool has the latest software version

Feb 15, 2017 | Mitsubishi L200 Cars & Trucks

1 Answer

How to disconnect a BCM in a chevy colorado 2007


Removal Procedure
Important:
• The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the body control module (BCM).
• Always disconnect the black body wiring harness connector FIRST and the gray instrument panel (I/P) wiring harness connector LAST.
• Always connect the black body wiring harness connector FIRST and the gray I/P wiring harness LAST.
• Do not open the BCM housing. The module does not have any serviceable components. The module may be replaced only as an assembly.
Ensure the ignition switch is in the OFF position.
Remove the right front hinge pillar trim panel. Refer to Body Hinge Pillar Trim Panel Replacement - Right Side .
Disconnect the body wiring harness electrical connector (1) from the BCM.
Release the fastener retaining the body wiring harness electrical connector to the BCM. Remove the 2 fasteners retaining the BCM to the hinge pillar.
Remove the BCM from the hinge pillar by unlocking the integral tab.
Remove the BCM from the vehicle.
If installing a replacement BCM, program the BCM. Refer to Control Module References .

Dec 19, 2016 | Cars & Trucks

1 Answer

05 buick cen.Turn key and nothing nopower,panellights,radio.Nothing.Pull key out and open door chime comes on,put in and it goes off


Gremlins ! No ! You want to know how this is possible ? The ignition switch is a low voltage input to the BCM - body control module ! Going by which position you have the key in ACCY , ON , run or start . The BCM system will control relays to turn on power to different parts of the vehicle ! The place to start would be to hook up a professional type scan tool that can communicate with the BCM . Could have U codes stored in one or more of the modules on the vehicle ! Do you know what a power mode master PPM is , BCM !
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 vehicle systems 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 system capable of performing the required function will respond to the BCM message.

Your best bet would be to take your vehicle to a Buick dealer !
Power Mode Master
This vehicles BCM fuctions as the Power Mode Master (PMM). Refer to Power Mode Description and Operation for a complete description of power mode functions.

Dec 16, 2016 | 2005 Buick Century

1 Answer

BCM in 2005 Saturn Vue


Remove the radio bezel. Refer to Radio Replacement .
Disconnect the body control module (BCM) electrical harnesses.
Remove the BCM from the instrument panel (I/P) retainer:
3.1. Pry the BCM tabs from the locking tabs on the underside of the restraint.
3.2. Slide the BCM out of the retainer

The BCM needs to be programmed if replaced !
The body control module (BCM) must be programmed with the proper RPO configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes, the BCM will not control all of the features properly. Ensure that the following conditions exist in order to prepare for BCM programming:
• The battery is fully charged.
• The ignition switch is in the ON position.
• The data link connector (DLC) is accessible.
• All disconnected modules and devices are reconnected before programming.
The following procedures need to be performed to properly configure a BCM:
BCM Programming
Passlock Learn
Program Key Fobs

Body Control Module (BCM)
In the center of the I/P, behind the HVAC control module

Dec 06, 2016 | Saturn Cars & Trucks

2 Answers

Where is the body control module located on a 1997 chevy cavalier 2 door


The BCM is located at the lower left side kick panel
Disconnect the negative battery cable
  1. Release the body control module (BCM) wire harness retainer from the BCM bracket.
  2. Disconnect the BCM electrical connectors from the BCM.
  3. Release the lock tabs and remove the BCM from the BCM bracket
  4. Remove the BCM bracket nuts (2) if required.
  5. Remove the BCM bracket (1) as an assembly if required

Jul 15, 2016 | Cars & Trucks

1 Answer

How i can replace BCM on Gmc sonoma 2000


Replacing the BCM is easy , There are some steps that need to be followed but still easy ! After the new BCM is installed that's when the average person gets into trouble , because they don't have the knowledge ! They replace the BCM an it won't start an other thing's won't work . Replacing a BCM is best left to the dealer or some other qualified repair shop . It needs to be programmed an then Passlock Learn procedure has to be done. You may be replacing it when it doesn't need replacing . What problem is your vehicle having ? Have you had it checked for DTC'S - diagnostic trouble codes ? An not OBD2 codes , BCM codes won't turn on the check engine (MIL) light .
The body control module (BCM) must be programmed with the proper RPO configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes the BCM will not control the features properly. Ensure that the following conditions exist in order to prepare for BCM programming:
?€¢
The battery is fully charged.


?€¢
The ignition switch is in the RUN position.


?€¢
The data link connector (DLC) is accessible.

Follow the instructions on the Techline Terminal and scan tool to program the BCM. If the BCM fails to accept the program, perform the following steps:
?€¢
Inspect all BCM connections.


?€¢
Verify that the Techline Terminal and scan tool have the latest software version.

May 19, 2016 | GMC Cars & Trucks

2 Answers

What tools are needed to replace BCM?


Important: Perform new BCM setup when you replace Body Control Module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration .
Disconnect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
Remove the left instrument panel insulator. Refer to Instrument Panel Insulator Replacement in Instrument Panel, Gauges and Console.
Disconnect the BCM electrical connectors.
Push the BCM up and move the bottom of the BCM away from and out of the mounting bracket slot in order to remove the BCM.
During Body Control Module (BCM) related service, the procedures below are designated to set-up the BCM correctly. Before you start, read these procedures carefully and completely.

Setup New Body Control Module (BCM)
Tools Required
Scan Tool (Tech 2) GM factory scan tool !
Important:
• Read this procedure carefully and completely.
• The BCM will not function properly if the Setup New BCM procedure is not performed.
• Perform the Theft Deterrent Re-learn procedure after successfully finishing the Setup New BCM procedure. If the Theft Deterrent Re-learn procedure is not performed after a BCM replacement, the following conditions may occur:
- The vehicle will not be protected against theft by the PASSLOCK system.
- The engine will not crank nor start. Your best bet is to take your vehicle to a dealer or a ASE certified repair shop who has proper tools .

Feb 16, 2016 | 2000 Oldsmobile Intrigue

1 Answer

DO I need to reprogram bcm if I will buy it brand new from ebay?


Yes it needs reprogramming ! The dealer is the place to have that done !
Body Control Module Programming and Setup
The procedures below are designed to set-up the body control module (BCM) correctly during BCM related service. Before you start, read these procedures carefully and completely.
Important: The following procedures must be followed:
  1. Programming the BCM
  2. Learning the restraints ID
  3. Programming Theft Deterrent System Components
  4. Program Key Fobs
  5. Program Tire Pressure Monitoring (TPM) System
Programming the BCM
Important: After the procedure is completed, the personalization settings of the BCM are set to a default setting. Inform the customer that the personalization must be set again.
Perform BCM special function "Request BCM Info. for SPS", then follow the instructions on the screen. Refer to Service Programming System (SPS) for more information.

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1 Answer

S10 pick truck bcm will not start with new bcm


That is because you need to have the new BCM programmed by the dealer.

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