2003 FORD MUSTANG test G

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).
Possible Causes
A no communication condition can be caused by:
zdamage to circuit 70 (LB/WH).
z a damaged DLC.
z a damaged scan tool.
z an RCM internal concern.
PINPOINT TEST P: NO COMMUNICATION WITH THE RESTRAINTS
CONTROL MODULE resolved. GO to
the Restraints
Control Module
(RCM) Diagnostic
Trouble Code
(DTC) Priority
Table in this
section for pinpoint
test direction.
No
RECONNECT the
system.
REACTIVATE the
system. PROVE
OUT the system.
REFER to
Air Bag Supplemental
Restraint System
(SRS) in this
section. CLEAR all
DTCs. Test Step Result / Action to
Take P1 CHECK THE RCM CONNECTOR C2041 AND CONNECTOR PIN 5
FOR DAMAGE 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 Yes
GO to
P2 .
No
REPAIR RCM
C2041 or RCM
C2041 pin 5 as
necessary. Klj . 43 ba
462003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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~ ...

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 the circuit.
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.
No
GO to P5 .
P5 CHECK CIRCUIT 70 (LB/WH) FOR AN OPEN
z
Measure the resistance between RCM C2041 pin 5, circuit 70
(LB/WH), harness side and DLC C251 pin 7, circuit 70 (LB/WH),
harness side.
z Is the resistance less than 5 ohms? Yes
INSTALL a new
RCM. 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.
No
REPAIR the circuit.
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 . 45 ba
462003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Remove the two screws retaining the duct to the A/C register.
z Separate the A/C duct at the air plenum and remove the duct.
8. Disconnect the passenger air bag module.
9. Attach the restraint system diagnostic tool to the vehicle harness side of the passenger air bag electrical connector.
10. Connect the battery ground cable. For additional information, refer to Section 414 - 01 .
11. With the restraint system diagnostic tools installed at all deployable devices, prove out the supplemental restraint system (SRS). For additional information, refer to Air Bag Supplemental Restraint System (SRS) in the Diagnosis and Testing portion of this section.
12. Disconnect the battery ground cable and wait at least one minute. For additional information, refer to Section 414 - 01 .
Reactivation WARNING: To reduce the risk of serious personal injury, read and follow all warnings,
cautions, and notes at the beginning of the deactivation procedure.
1. Disconnect the battery ground cable and wait at least one minute. For additional information, refer to Section 414 - 01 .
2. Remove the restraint system diagnostic tool from the passenger air bag module electrical connector. Klj . 4 ba
72003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

8. Install the steering column opening lower reinforcement.
1. Position the steering column opening lower reinforcement.
2. Install the bolts.
9. Install the steering column opening lower finish panel. 1. Align the steering column opening lower finish panel and push in, seating the retaining clips.
2. Install the screws.
10. Connect the battery ground cable. For additional information, refer to Section 414 - 01 .
11. 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.
With all the restraint system diagnostic tools removed, prove out the supplemental restraint
system (SRS). For additional information, refer to Air Bag Supplemental Restraint System (SRS) in the Diagnosis and Testing portion of this section. Klj . 6 ba
72003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Connect the RCM.
1. Position the RCM.
2. Install the bolts.
3. Connect the RCM electrical connector.
4. Slide and engage the RCM electrical connector locking clip.
5. Reposition the carpet.
2. Install the RCM. 1. Install the bolt.
2. Reposition the carpet.
3. Connect the battery ground cable. For additional information, refer to Section 414 - 01 .
4. With the restraint system diagnostic tools installed at all deployable devices, prove out the supplemental restraint system (SRS). For additional information, refer to Air Bag Supplemental Restraint System (SRS) in the Diagnosis and Testing portion of this section.
5. Disconnect the battery ground cable and wait at least one minute. For additional information, refer to Section 414 - 01 .
6. Restore the vehicle to operating condition. 1. WARNING: To reduce the risk of serious personal injury, read and follow all
warnings, cautions, notes, and instructions in the supplemental restraint system
(SRS) deactivation/reactivation procedure.
Reactivate the supplemental restraint system (SRS). For additional information, refer to
Supplemental Restraint System (SRS) Deactivation and Reactivation in the General
Procedures portion of this section.
2. WARNING: The restraint system diagnostic tool is for restraint system
service only. Remove from the vehicle prior to road use. Failure to remove could
result in injury and possible violation of vehicle safety standards.
With all the restraint system diagnostic tools removed, prove out the supplemental
restraint system (SRS). For additional information, refer to Air Bag Supplemental Klj . 3 ba
42003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Restraint System (SRS) in the Diagnosis and Testing portion of this section. Klj . 4 ba
42003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

9. With the restraint system diagnostic tools installed at all deployable devices, prove out the
supplemental restraint system (SRS). For additional information, refer to Air Bag Supplemental Restraint System (SRS) in the Diagnosis and Testing portion of this section.
10. Disconnect the battery ground cable and wait at least one minute. For additional information, refer to Section 414 - 01 .
Installation
WARNING: To reduce the risk of serious personal injury, read and follow all warnings,
cautions and notes at the beginning of the removal procedure.
1. Disconnect the battery ground cable and wait at least one minute. For additional information, refer to Section 414 - 01 .
2. Remove the restraint system diagnostic tool from the clockspring electrical connector at the top of the steering column.
3. Connect the driver air bag module. 1. Connect the driver air bag module electrical connector.
2. Position the driver air bag module to the steering wheel.
4. Install the two driver air bag module bolts. Klj . 4 ba
62003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...