Question about 2002 Mercedes-Benz C-Class
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Posted on Jan 02, 2017
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Supplemental Restraint System (SRS) Depowering and
WARNING: Always wear safety glasses when repairing an air
restraint system (SF3) vehicle and when handling an air bag
module. This will reduce
the risk of injury in the event of an accidental deployment.
WARNING: Never probe the connectors on the airbag module.
Doing so can result in
air bag deployment, which can result in personal injury.
WARNING: To reduce the risk of personal injury, do not use
any memory saver
NOTE: Ifa seat equipped with a seat mounted side airbag and
or a safety belt
pretensioner (if equipped) system is being serviced, the
supplemental restraint system
(SES) must be depowered.
NOTE: The air bag warning lamp illuminates when the RCM fuse
is removed and the
ignition switch is ON. This is normal operation and does not
indicate a supplemental
restraint system (SRS) fault.
NOTE: The SRS must be fully operational and free of faults
before releasing the vehicle
to the customer
1. Turn all vehicle accessories OFF.
2. Turn the ignition switch to OFF.
3. At the central junction box (Cm), located below the LH
side of the instrument panel,
remove the cover and the restraints control module (RCM)
fuse F223 (lOA) from
the CTh. For additional information, refer to the Wiring
4. Turn the ignition ON and visually monitor the air bag
indicator for at least 30
seconds. The air bag indicator will remain lit continuously
(no flashing) if the correct
ROsI fuse has been removed, If the air bag indicator does
not remain lit
continuously, remove the correct RCM fuse before proceeding
5. Turn the ignition switch to OFF.
6. WARNING: To avoid accidental deployment and possible
personal injury, the
backup power supply must be depleted before repairing or
replacing any front or
side air bag supplemental restraint system (SRS) components
and before set-ricing,
replacing, adjusting or striking components near the front
or side air bag sensors,
such as doors, instrument panel, console, door latches,
strikers, seats and hood
To deplete the backup power supply energy, disconnect the
battery ground cable
and wait at least one minute. Be sure to disconnect
auxiliary batteries and power
supplies (if equipped).
Disconnect the battery ground cable and wait at least one
1. WARNING: The restraint system diagnostic tool is for
restraint system service
only. Remove from vehicle prior to road use. Failure to
remove could result in
injury and possible violation of vehicle safety standards.
Make sure all restraint system diagnostic tool(s) that may
have been installed during
the repair have been removed from the vehicle and all SRS
2. Turn the ignition switch from OFF to ON.
3. Install the ROsI fuse F2.23 (lOA) to the DB and install
4. WARNING: Be sure that nobody is in the vehicle and that
there is nothing
blocking or set in front of any air bag module when the
battery ground cable is
Connect the battery ground cable.
5. Prove out the supplemental restraint system (SRS) as
Turn the ignition key from ON to OFF. Wait 10 seconds, then
turn the key back to
ON and visually monitor the air bag indicator with the air
bag modules installed. The
air bag indicator will light continuously for approximately
six seconds and then turn
off. If an air bag supplemental restraint system (SF3) fault
is present, the air bag
- failto light.
- remain lit continuously.
The flashing might not occur until approximately 30 seconds
after the ignition switch
has been turned from the OFF to the ON position. This is the
time required for the
restraints control module (RCM) to complete the testing of
the SRS. if the air bag
indicator is inoperative and a SRS fault exists, a chime
will sound in a pattern of 5
sets of 5 beeps. If this occurs, the air bag indicator and
any SRS fault discovered
must be diagnosed and repaired.
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