Hombre S Regular Cab 4WD V6-4.3L (1999)
Body Control Module: Initial Inspection and Diagnostic Overview
A Diagnostic Starting Point
Begin the diagnosis of the body control system by performing the Diagnostic System Check for the system in which the customer concern is apparent.
The Diagnostic System Check will direct you to the correct procedure for diagnosing the system and where the procedure is located.
A Diagnostic System Check - Body Control System
Circuit Description
IMPORTANT:
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After performing a repair that requires clearing DTC(s) from the BCM, inspect the repair by operating the vehicle within the limits shown in
Conditions for Setting the DTC. Operating the vehicle under these specifications will verily that the repair was completed properly.
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Use the J 35616-A when probing electrical circuits in order to prevent damage to damage to electrical components and connectors. The J 35616-A
is the ONLY recommended method of probing connectors, terminals, fuse blocks and relay blocks. The J 35616-A contains an assortment of
flexible connectors used in order to probe connectors, terminals, fuse blocks and relay blocks during diagnosis.
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Do not use a test lamp in order to diagnose the BCM electrical systems unless you are specifically instructed by diagnostic procedures. Use the J
35616-A when diagnostic procedures require probing of connectors. Refer to Special Tools.
See: Tools and Equipment
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The Body control module (BCM) will withstand normal current draws associated with the vehicle operations. Do not overload any circuit.
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When you test for opens or shorts, do not ground or apply voltage to the BCM circuits unless instructed to do so. Use a J 39200 digital multimeter
(DMM) (or equivalent) in order to test these circuits. Test electrical circuits using a DMM while the BCM connectors remain connected to the
BCM or to the recommended breakout box.
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Do not remove or apply the voltage to the BCM when the key is in the RUN position. Always turn the key to the LOCK position when any of the
following components are removed or connected:
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Battery cables
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Fuses
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Connectors
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Whenever a BCM removal or replacement procedure is performed follow the instructions. Use the following guidelines when servicing the BCM
system:
