Ford 2003 Mustang Workshop Manual page 4037

Pinpoint Test D: LFC 15/DTC B 1887— Driver Air Bag Circuit Shorted to Ground
Normal Operation
The restraints control module (RCM) checks for driver air bag circuit shorts to ground by monitoring the
voltage of circuits 614 (GY/OG) and 615 (GY/WH) at pins 3 and 4. If the RCM detects a short to
ground on either of these pins, it will store a diagnostic trouble code (DTC) B1887 in memory and flash
a lamp fault code (LFC) 15 (or higher priority code if one exists) on the air bag indicator.
Possible Causes
A driver air bag circuit short to ground can be caused by:
a short to ground on circuit 614 (GY/OG).
a short to ground on circuit 615 (GY/WH).
a short to ground on the clockspring (14A664).
a short to ground on the driver air bag module.
an RCM internal concern.
PINPOINT TEST D: LFC 15/DTC B1887 — DRIVER AIR BAG CIRCUIT
SHORTED TO GROUND
D1 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 B1887 retrieved during the on-demand self test?
Test Step
system. PROVE
OUT the system.
REFER to Air Bag
Supplemental
Restraint System
(SRS) in this
section. CLEAR
all DTCs.
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 D2 .
No
This is an
intermittent fault.
The fault condition
is not present at
this time. GO to
D5 .