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Posts Tagged: body control module

BCM body control module

What does a BCM body control module do? A body control module (BCM) is a computer used to control electrical items in a car or truck which used to be controlled individually by switches. Car makers switched to this design for several reasons: to reduce overall vehicle weight by reducing the size and quantity of copper wire used, to monitor and control power usage, to allow for remote operation and diagnostics. BCM can switch power to lights For example, in non-computerized vehicles, the power for headlights was supplied by a … Read More

Central Timer Module, body control module, gem module

What the heck is a Central Timer Module, body control module, gem module As I read auto forums I constantly hear people asking what a body control module does, where it’s located and how to fix it. These computers are known by several different names. Central Timer Module, body control module, gem module. Every car maker is switching to digital controls for almost all vehicle functions. It’s an effort to reduce wiring costs and complexity, reduce weight, and have complete control over all systems to further increase MPG. To understand … Read More

Power windows, radio, blower Grand Caravan

Power windows, radio, blower stop working Dodge Grand Caravan If you run into a problem where these electrical accessories work when the key is turned to the RUN position but the engine is off, but stop working when the engine is running, the problem may be either the ignition switch or the intelligent power module (IPM). Start by checking the voltages from the ignition switch when it is in various positions. With the key out, the ignition switch reports 4.6 volts to the BCM. The voltage goes down to 4.04 … Read More

How to fix electrical problems on Minivan

Electrical problems on Chrysler Minivan If you experience Electrical problems on Chrysler Minivan read this post. The body control module (BCM) controls the power door locks, automatic door locks, door lock inhibit (child locks), chime driver, compass, trip computer, interior lighting, power liftgate, exterior lighting headlight time delay, automatic headlights, illuminated entry, backup lights, interior light fade to off feature, and instrument panel lighting. So when you see several electrical units inoperative, the cause may be the BCM. However, once the BCM receives a switched signal from the driver’s operations, … Read More

No reverse lights dodge caravan

Fix no reverse lights dodge caravan 2001-07 Dodge Grand Caravans use the Body Control Module (BCM) to turn on the back-up lights. If you have a situation with No reverse lights dodge caravan, read this post. The BCM also controls the power door locks, automatic door locks, door lock inhibit (child locks), chime driver, compass, trip computer, interior lighting, power liftgate, exterior lighting headlight time delay, automatic headlights, illuminated entry, interior light fade to off feature, and instrument panel lighting. The BCM looks for signal from the gear shift. If … Read More

Headlight Problems Chrysler minivan

Fix a headlight problem on a minivan If you have Headlight Problems Chrysler minivan, read this article. They’ve made the system so complicated that in some cases you need a scan tool to find out what’s wrong. Don’t own a $3,000 scan tool? Well, you can still do some of your own diagnostics. But first you have to understand the method behind Chrysler’s madness. It’s like Old Mcdonald’s Farm Chrysler wants every switch to go through a computer. Then one computer talks to another. The first computer is called the … Read More

Automatic door Locks don’t work, Opening Liftgate Triggers Alarm

Automatic door Locks don’t work, Opening Liftgate Triggers Alarm Chrysler is having a problem where the Automatic Door Locks don’t work, Opening Liftgate Triggers Alarm. They’ve has issued a TSB (08-040-0) to correct software programming in the body control module. The software update fixes a problem where the door locks stop working or when opening the liftgate triggers the alarm system. This update is NOT a recall and you will have to pay for it if your vehicle is not covered by an extended warranty. The affected vehicles are: 2004-05 … Read More


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