Explorer Sport Trac 4WD V8-4.6L VIN 8 (2007)
Air Bag Control Module: Description and Operation
RESTRAINTS CONTROL MODULE (RCM)
WARNING:
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Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is
connected and the ignition switch is ON. Failure to follow these instructions may result in the inadvertent deployment of the safety
canopy and risk of personal injury.
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The restraints control module (RCM) orientation is critical for correct system operation. If a vehicle equipped with an air bag
supplemental restraint system (SRS) has been involved in a collision in which the center tunnel area has been damaged, inspect the
mounting and bracket for deformation. If damaged, a new RCM must be installed whether or not the air bags have deployed. In addition,
make sure the area of the RCM mounting is restored to its original condition.
CAUTION: When installing a new RCM on vehicles built 7/31/06 or after, it is necessary to carry out programmable module installation
(PMI).
NOTE: When installing a new RCM, always make sure the correct RCM is being installed. If an incorrect RCM is installed, erroneous DTCs will
result.
The RCM carries out the following functions:
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deploys the air bag(s) in the event of a deployable crash.
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activates the safety belt buckle pretensioner and safety belt adaptive load limiting retractor to control tension on the safety belt.
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monitors the SRS for faults.
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requests the illumination of the air bag indicator if a fault is detected.
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communicates through the DLC the on-demand or continuous DTCs.
The RCM monitors the SRS for possible faults. If a fault is detected while the ignition switch is in the ON position, the RCM will request illumination of
the air bag indicator located in the instrument cluster.
When the ignition is cycled (turned OFF and then ON), the air bag indicator will prove out by lighting for 6 seconds and then off. If a SRS fault exists,
the air bag indicator will illuminate and remain illuminated for the rest of the key cycle. The RCM will also communicate the on-demand (current) and
continuous (historical) DTCs through the DLC, to the scan tool. If the RCM requests illumination of the air bag indicator and the air bag indicator does
not function, the instrument cluster module will automatically activate an audible chime. The chime is a series of 5 sets of 5 tone bursts. If the chime is
heard, the SRS and the air bag indicator require repair.
The RCM includes a backup power supply. This feature provides sufficient backup power to deploy the air bags in the event that the ignition circuit is
lost or damaged during impact. The backup power supply will deplete its stored energy approximately one minute after the battery ground cable is
disconnected.
