Ford 2003 Mustang Workshop Manual page 4029

An air bag indicator that is illuminated continuously can be caused by one of the following:
worn or damaged shorting bar or camming beam.
the ignition circuit damaged.
the RCM disconnected from the vehicle harness.
a loss of RCM ground circuits.
the RCM inoperative.
circuitry.
PINPOINT TEST A: THE AIR BAG WARNING INDICATOR IS
ILLUMINATED CONTINUOUSLY — RCM DISCONNECTED,
INOPERATIVE, OR LOST/LOW IGNITION FEED
A1 CHECK FOR CONTINUOUS OR ON-DEMAND SELF TEST DTCs
Key in OFF position.
Connect the diagnostic tool. Scan Tool
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool:
Retrieve/Clear Continuous DTCs.
Retrieve and record any continuous DTCs for use later in this pinpoint
test.
Enter the following diagnostic mode on the diagnostic tool: On-
Demand Self Test.
Were any continuous or on-demand self test DTCs retrieved?
A2 CHECK THE RCM CONNECTION
WARNING: If the supplemental restraint system (SRS) is
being serviced, the system must be deactivated and restraint
system diagnostic tools must be installed. Refer to
Supplemental Restraint System (SRS)
The air bag restraint system diagnostic tools must be removed
and the air bag modules reconnected when the system is
reactivated to avoid non-deployment in a collision, resulting in
possible personal injury. NOTE: Diagnostics or repairs are not to
be performed on a seat equipped with a seat side air bag with the
seat in the vehicle. Prior to attempting to diagnose or repair a seat
concern when equipped with a seat side air bag, the seat must be
removed from the vehicle and the restraint system diagnostic tools
must be installed in the seat side air bag electrical connectors. The
restraint system diagnostic tools must be removed prior to
operating the vehicle over the road. NOTE: After diagnosing or
Test Step
in this section.
Result / Action to
Yes
If continuous
DTCs were
retrieved, GO to
A3 . If on-demand
DTCs were
retrieved, GO to
the Restraints
Control Module
(RCM) Diagnostic
Trouble Code
(DTC) Priority
Table in this
section for
pinpoint test
direction.
No
GO to A2
Yes
GO to A3
Air Bag
No
CONNECT C2041
and engage the
locking tabs. GO
to A7 .
Take
.
.