2003 FORD MUSTANG Workshop Manual

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Page 4065 of 4378

FORD MUSTANG 2003 Workshop Manual Test Step Result / Action to
Take N1 CHECK FOR A HARD OR INTERMITTENT DTC
�z
Key in OFF position.
�z Connect the diagnostic tool. Scan Tool
�z Key in ON position.
�z Enter the following diagnos

Test Step Result / Action to
Take N1 CHECK FOR A HARD OR INTERMITTENT DTC
z
Key in OFF position.
z Connect the diagnostic tool. Scan Tool
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic tool:
Retrieve/Clear Continuous DTCs.
z Retrieve and record any continuous DTCs for use later in this
pinpoint test.
z Enter the following diagnostic mode on the diagnostic tool: On-
Demand Self Test.
z Was DTC B1869 retrieved during the on- demand self test? 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
N2 .
No
This is an
intermittent fault.
The fault
conditions not
present at this
time. GO to N5 .
N2 CHECK THE RCM
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 Air Bag Supplemental Restraint System (SRS) in this section.
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
repairing an SRS, the restraint system diagnostic tools must be
removed before operating the vehicle over the road. NOTE: After
diagnosing or repairing a seat system, the restraint system
diagnostic tools must be removed before operating the vehicle
over the road. NOTE: The SRS must be fully operational and free of
faults before releasing the vehicle to the customer.
z Key in OFF position.
z Deactivate the system. Refer to Air Bag Supplemental Restraint System (SRS) in the Diagnosis and Testing portion of this section.
z Key in OFF position.
z Disconnect: RCM C2041.
z Measure the resistance between RCM C2041 pin 20, component
side and a known good chassis ground. Yes
INSTALL a new
RCM. GO to
N6 .
No
GO to N3 . Klj . 38 ba
462003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Page 4066 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the resistance less than 10 ohms? N3 CHECK CIRCUIT 608 (BK/YE) FOR A SHORT TO GROUND
�z
Key in OFF position.
�z Disconnect: Instrument Cluster C220a.
�z Measure the resistance to ground at i

Page 4067 of 4378

FORD MUSTANG 2003 Workshop Manual Pinpoint Test O: DTC B1870 —
Air Bag Indicator Shorted to Battery
Normal Operation
The air bag indicator is designed to illuminate for 6 (+/- 2) seconds when the ignition switch is turned to
the

Page 4068 of 4378

FORD MUSTANG 2003 Workshop Manual 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

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:
zdamaged wiring on circuit 608 (BK/YE).
z an instrument cluster malfunction.
z an RCM internal concern.
PINPOINT TEST O: DTC B1870 — AIR BAG INDICATOR SHORTED
TO BATTERY Test Step Result / Action to
Take O1 CHECK FOR A HARD OR INTERMITTENT DTC
z
Key in OFF position.
z Connect the diagnostic tool. Scan Tool
z Key in ON position.
z Enter the following diagnostic mode on the diagnostic tool:
Retrieve/Clear Continuous DTCs.
z Retrieve and record any continuous DTCs for use later in this pinpoint
test.
z Enter the following diagnostic mode on the diagnostic tool: On-
Demand Self Test.
z Was DTC B1870 retrieved during the on- demand self test? 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 .
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 Air Bag Supplemental Restraint System (SRS) in this section.
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 Yes
INSTALL a new
RCM. GO to
O5 .
No
GO to O3 . Klj . 41 ba
462003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Page 4069 of 4378

FORD MUSTANG 2003 Workshop Manual restraint system diagnostic tools must be removed prior to
operating the vehicle over the road. NOTE:
After diagnosing or
repairing an SRS, the restraint system diagnostic tools must be
removed b

Page 4070 of 4378

FORD MUSTANG 2003 Workshop Manual Pinpoint Test P: No Communication With The Restraints Control Module
Normal Operation
The RCM communicates with the scan tool using ISO 9141 communication mode through the data link
connector (DLC)

Page 4071 of 4378

FORD MUSTANG 2003 Workshop Manual 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

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
repairing an SRS, the restraint system diagnostic tools must be
removed before operating the vehicle over the road. NOTE:
After diagnosing or repairing a seat system, the restraint system
diagnostic tools must be removed before operating the vehicle
over the road. NOTE: The SRS must be fully operational and free
of faults before releasing the vehicle to the customer.
z Key in OFF position.
z Deactivate the system. Refer to Air Bag Supplemental Restraint System (SRS) in the Diagnosis and Testing portion of this section.
z Key in OFF position.
z Disconnect: RCM C2041.
z Inspect RCM C2041, harness side and RCM C2041, component
side, pin 5 for damage.
z Are RCM C2041 and RCM C2041 pin 5 OK? REACTIVATE the
system.
P2 CHECK THE DLC CONNECTOR C251 AND CONNECTOR PIN 7
FOR DAMAGE z
Inspect DLC C251 and DLC C251 pin 7 for damage.
z Are DLC C251 and DLC C251 pin 7 OK? Yes
GO to
P3 .
No
REPAIR DLC C251
or DLC C251 pin 7
as necessary.
RETEST the
communication to
RCM.
RECONNECT the
system.
REACTIVATE the
system. PROVE
OUT the system.
REFER to Air Bag Supplemental
Restraint System
(SRS) in this
section. P3 CHECK CIRCUIT 70 (LB/WH) FOR SHORT TO BATTERY
z
Measure the voltage to ground at DLC C251 pin 7, circuit 70
(LB/WH).
z Can any voltage be measured? Yes
REPAIR the battery
short. RETEST the
communication to
RCM.
RECONNECT the
system.
REACTIVATE the
system. PROVE
OUT the system.
REFER to
Air Bag Supplemental
Restraint System
(SRS) in this
section. Klj . 44 ba
462003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Page 4072 of 4378

FORD MUSTANG 2003 Workshop Manual No
GO to
P4 .
P4 CHECK CIRCUIT 70 (LB/WH) FOR SHORT TO GROUND
�z
Measure the resistance to ground at DLC C251 pin 7, circuit 70
(LB/WH).
�z Is the resistance less than 10,000 ohms? Yes
REPAIR

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