F 550 2WD Super Duty V10-6.8L VIN V (2005)
Air Bag Control Module: Description and Operation
RESTRAINTS CONTROL MODULE (RCM)
NOTE: When a new RCM is first installed in the vehicle, module configuration must be carried out.
If the RCM is incorrectly configured, erroneous DTC(s) will result. The RCM is mounted on the center tunnel under the instrument panel. The RCM:
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signals the inflators to deploy the air bags in the event of a deployable crash.
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monitors the air bag SRS for faults.
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illuminates the air bag indicator if a fault is detected.
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flashes the air bag indicator to indicate the lamp fault code (LFC) detected.
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communicates through the data link connector (DLC) the current or historical diagnostic trouble codes (DTCs).
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signals the instrument cluster to activate a chime if the air bag indicator is not available and another SRS fault exists.
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contains internal sensors which are not serviced separately.
The RCM monitors the SRS for possible faults. If a fault is detected while the ignition switch is in the RUN position, the RCM will illuminate the air bag
indicator located in the instrument cluster.
When the ignition is cycled (turned OFF and then ON), the air bag indicator will remain lit for 6 seconds and then go out. If an SRS fault exists, the air
bag indicator will then flash the 2-digit LFC. The air bag indicator will flash the LFC 5 times, then it will remain illuminated for the rest of the key cycle.
The RCM will also communicate the current and historical DTCs through the data link connector (DLC), using the diagnostic tool. If the air bag
indicator does not function, and the system detects a fault condition, the RCM will signal the instrument cluster to 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.
LFCs are prioritized. If 2 or more faults occur at the same time, the fault having the highest priority will be displayed first. After that fault has been
corrected, the next highest priority fault will be displayed.
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
damaged in a collision before air bag sensors determine that an air bag deployment is activated. The backup power supply will deplete its stored energy
approximately 1 minute after ignition power is removed from the RCM.
