What is BCM Module?
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Generally
speaking, there are 2 types of engine computers used in your vehicle:
one for engine management (called ecm, ecu, pcm or eca) and a second
one for the vehicle body that controls the dash panel and all the
gages; security like alarm system which monitors all openings like
doors and tailgates; audio and sound system; wipers and cruise
system…in short almost all the functions of your vehicle
except the engine!
Sometimes
you will experience your dash gages not working accompanied by both
radio and wipers quitting at the same time. What to do? Check your BCM.
Here are some quick checks you
can do to test your BCM:
Find
the location of the BCM module usually located under your dash panel
depending on the vehicle type and model.
http://www.automotivetroubleshootingsecrets.com can assist you in
finding the correct location/wiring diagram for most vehicles up to
2003-2004 models).
Once
you find the BCM, you can do the following:
Wiggle
test the wiring terminals going to it while the problem is acting up.
If there is a bad connection, you might find a change in the symptom.
Undo
the ecm terminal to isolate the bcm (remember to remove the battery
connection every time you touch the bcm or your ecm). Why isolate the
ecm? Because if there is a short in the ecm (engine computer) circuit,
it will affect the bcm too. Sometimes after you disconnect the ecm, the
dash gages return which shows
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