
GENERAL PROCEDURES
Key Programming —
Program a Key Using Two
Programmed Keys
NOTE: This procedure only works if two or more programmed ignition keys are available and it is
desired to program additional key(s). If two keys are not available, follow the procedure in Key Programming — Erase All Key Codes and Program Two Keys .
NOTE: PID SPARE_KY must be enabled for this procedure to operate. If this Parameter Identification
(PID) Index is not enabled, follow the security access procedure and select Spare Key Programming
Switch: Enabled.
NOTE: If the programming procedure is successful, the new key(s) will start the vehicle and the
THEFT INDICATOR will illuminate for approximately three seconds.
NOTE: If the programming procedure is not successful, the new key(s) will not start the vehicle and the
THEFT INDICATOR will flash. If the programming procedure was not successful, repeat the key
programming procedure from Step 1. If the failure repeats, check Circuit 729 (RD/WH) (hot at all times)
in instrument cluster for proper battery voltage. Repair the circuit if voltage is not present. For
additional information, refer to Diagnosis and Testing to review diagnostic trouble codes (DTCs) and
perform pinpoint tests as required.
NOTE: A maximum of eight ignition keys can be programmed to a passive anti- theft system (PATS)
equipped vehicle. Use PID NUMKEYS to determine how many keys are programmed to the vehicle.
NOTE: If the steps are not performed as outlined, the programming procedure will end.
NOTE: Ignition keys must have correct mechanical key cut for the vehicle and must be a PATS
encoded key.
1. Insert the first programmed ignition key into the ignition lock cylinder and turn the ignition switch from OFF to RUN (maintain the ignition switch in RUN for one second).
2. Turn the ignition switch to OFF and remove the first key from the ignition lock cylinder.
3. Within five seconds of turning the ignition switch to OFF, insert the second programmed ignition key into the ignition lock cylinder and turn the ignition switch from OFF to RUN (maintain the
ignition switch in RUN for one second).
4. Turn the ignition switch to OFF and remove the second key from the ignition lock cylinder.
5. Within 10 seconds of turning the ignition lock cylinder to OFF, insert the unprogrammed ignition key (new key) into the ignition lock cylinder and turn the ignition switch from OFF to RUN
SECTION 419-
01: Anti-Theft — PATS 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool Klj . 1 ba
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GENERAL PROCEDURES
Key Programming —
Enable/Disable Spare Key
Programming
NOTE: The spare key programming switch is a diagnostic tool programmable switch that provides the
capability to enable/disable the spare key programming procedure. This procedure is in the Owners
Guide spare key programming procedure or in this section under Key Programming — Program a Key
Using Two Programmed Keys . This programmable switch is provided as a convenience for rental
company fleets or other fleet purchasers who may not want the spare key programming procedure
available to the vehicle driver.
NOTE: The spare key programming switch state can be viewed by instrument cluster PID SPARE_KY.
1. Insert a programmed ignition key into the ignition lock cylinder and turn the ignition switch to RUN.
2. Enter diagnostic tool. Follow the SECURITY ACCESS PROCEDURE. For additional information, refer to Security Access — Procedure to obtain security access.
3. NOTE: The default setting on delivery of all new vehicles is
From diagnostic tool menu, select SPARE KEY PROGRAMMING SWITCH selection to the
desired setting:
SECTION 419-
01: Anti-Theft — PATS 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool Klj . 1 ba
22003 Mustang Workshop Manual
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GENERAL PROCEDURES
Key Programming —
Additional Key With One Programmed
Key
NOTE: This procedure is used when a customer needs to have an additional key programmed into the
vehicle without erasing stored key codes, but does not have two programmed keys available. This
procedure is also useful when attempting to determine if an ignition key is defective, as a new key can
be installed without erasing keys or without having two programmed keys available.
NOTE: Before programming, the new key must have the correct mechanical cut for the ignition lock.
NOTE: If eight keys are already programmed, this procedure will not allow any further ignition keys to
be programmed without erasing all stored key codes first. The number of keys programmed into the
system can be determined using the PID NUMKEYS.
1. Turn the ignition switch from the OFF position to the RUN position using the new, unprogrammed ignition key.
2. Enter diagnostic tool using the Ford Service Function (FSF) card and enter the appropriate instrument cluster. Follow Security Access to obtain security access. For additional information,
refer to Security Access — Procedure .
3. From the diagnostic tool menu Select: IGNITION KEY CODE PROGRAM.
4. Turn the ignition switch to the OFF position and disconnect diagnostic tool.
5. Attempt to start the engine with the new ignition key. The vehicle engine should start and run normally.
SECTION 419-
01: Anti-Theft — PATS 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

GENERAL PROCEDURES
Security Access —
Procedure
NOTE: The security access procedure is utilized to obtain passive anti- theft system (PATS) security
access. PATS security access must be granted to erase ignition keys, enable/disable the spare key
programming switch or perform parameter resets for the instrument cluster. The security access
procedure invokes an inherent 10 minute time delay prior to granting security access during which
diagnostic tool must remain connected to the vehicle. Once security access has been granted, a
security access command menu is displayed that offers various command options (refer to PATS
Configuration Command Index).
NOTE: Select only the commands required by the appropriate pinpoint test.
1. From diagnostic tool: Using the Ford Service Function (FSF) card, select the appropriate instrument cluster. Enter SECURITY ACCESS PROCEDURE. This procedure will take 10
minutes to perform, during which the ignition switch must be in RUN and the diagnostic tool
must be connected to the vehicle.
2. After the 10- minute security access procedure has been completed, a new menu will be
displayed with command options. Select only those functions required before exiting out of this
menu. Once exited out of this menu, the security access procedure must be performed again to
perform additional commands.
SECTION 419-
01: Anti-Theft — PATS 2003 Mustang Workshop Manual Special Tool(s)
Worldwide
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

DIAGNOSIS AND TESTING
Multifunction Electronic Module
For warning chime concerns, refer to
Section 413 - 09 .
For courtesy lamps/illuminated entry and battery saver concerns, refer to Section 417 - 02 .
For one- touch window concerns, refer to Section 501 - 11 .
For wiper/washer control and interval timer concerns, refer to Section 501 - 16 .
For keyless entry and power door lock concerns, refer to Section 501 - 14B .
For anti- theft concerns, refer to Section 419 - 01 .
SECTION 419-
10: Multifunction Electronic Control Modules 2003 Mustang Workshop Manual Klj . 1 ba
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DIAGNOSIS AND TESTING
Body System
Inspection and Verification
Leaks
NOTE:
Trim will reveal the location of most leaks.
1. Remove any trim or carpet in the general area of the leak.
2. Road test or water test the vehicle.
3. Inspect for a dust pattern around the area in question. Inspect for water paths near and above the area in question.
4. Some leaks can be located by placing bright light under the vehicle, removing any necessary trim or carpet, and inspecting the interior of the body at joints and weld lines.
Noise
Wind noise, rattles, and their sources are detected by driving the vehicle at highway speeds. The
vehicle should be driven in four different directions with all of the windows closed, the radio off, the
blower motor off, and all of the ventilation ducts open.
Most wind noise leaks will occur at the door and window seals or at the sheet metal joints in the door
or the door opening.
Symptom Chart SECTION 501-
00: Body System — General Information 2003 Mustang Workshop Manual Symptom Chart
Condition
Possible Sources Action
z Dust and
Water Leaks z
Body sealer missing.
z Opening in weldings
or body joints.
z Components not fully
installed.
z Components missing.
z Components
damaged. z
REMOVE trim panel. CHECK
for leaks and SEAL with
appropriate sealer. ROAD
TEST or WATER TEST for
leaks. RECHECK for leaks;
USE light under the vehicle
with trim removed. CHECK
interior of body at joints and
weld lines.
z Dust/Water
Leaks at Floor
Pan and
Grommets z
Missing or damaged
plugs and/or
grommets. z
CHECK plugs for proper
installation. REPLACE if
necessary.
z Door Drain
Holes
Collecting
Water z
Holes clogged with
mud or road tar. z
CLEAN drain holes of dirt and
foreign material. CHECK drain
holes regularly. TEST the
system for normal operation. Klj . 1 ba
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