Ford 2003 Mustang Workshop Manual page 4068

circuit, it will store a diagnostic trouble code (DTC) B1870 in memory.
If the RCM detects an air bag indicator failure in addition to another SRS failure, the RCM will send a
signal to the generic electronic module (GEM) to produce five sets of five tone bursts.
Possible Causes
An air bag indicator short to battery condition can be caused by:
damaged wiring on circuit 608 (BK/YE).
an instrument cluster malfunction.
an RCM internal concern.
PINPOINT TEST O: DTC B1870 — AIR BAG INDICATOR SHORTED
TO BATTERY
O1 CHECK FOR A HARD OR INTERMITTENT DTC
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.
Was DTC B1870 retrieved during the on-demand self test?
O2 CHECK THE AIR BAG INDICATOR CIRCUIT
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
Test Step
in this section.
Result / Action to
Take
Yes
This is a hard
fault. The fault
condition is still
present. This fault
cannot be cleared
until it is corrected
and the DTC is no
longer retrieved
during the on-
demand self test.
GO to O2
No
This is an
intermittent fault.
The fault condition
is not present at
this time. GO to
O4 .
Yes
INSTALL a new
RCM. GO to
Air Bag
No
GO to O3
.
O5 .
.