test G FORD MUSTANG 2003 Workshop Manual

z
Do the PID values agree with the ignition switch
positions? REFER to
Section 413 - 09 for
key- in-ignition warning chime
concerns. D2 CHECK THE GEM PID LAST DATA RECEIVED FOR
LUGGAGE COMPARTMENT z
Remove the ignition key from the ignition.
z Connect the diagnostic tool.
z Monitor the GEM PID LAST DATA RECEIVED while
pressing and releasing the luggage compartment, panic,
lock, and unlock buttons of the remote transmitter.
z Does LAST DATA RECEIVED match the button
presses of the remote transmitter? Yes
GO to
D5 .
No
GO to D3 .
D3 CHECK THE BATTERIES IN THE REMOTE
TRANSMITTER z
Install new batteries in the remote transmitter.
z Connect the diagnostic tool.
z Monitor the GEM FUNCTION TEST TIC/DATA while
pressing the luggage compartment button on the remote
transmitter.
z Does LAST DATA RECEIVED match the button
presses of the remote transmitter? Yes
SYSTEM is OK. REPEAT the
self-
test. CLEAR the DTCs.
No
GO to D4 .
D4 REPROGRAM THE REMOTE TRANSMITTERS TO THE
GEM z
NOTE: When carrying out the following procedure, it
must be noted that all previous programmed remote
transmitters will be erased. The customer needs to be
informed that any remote transmitters not present during
the programming mode will not operate the vehicle. All
remote transmitters must be programmed at the same
time.
z Reprogram the remote transmitter to the GEM. For
additional information, refer to Programming — Keyless
Entry Remote Transmitter .
z Connect the diagnostic tool.
z Monitor the GEM FUNCTION TEST TIC/DATA while
pressing the lock and unlock buttons on the remote
transmitter.
z Does LAST DATA RECEIVED match the button
presses of the remote transmitter? Yes
SYSTEM is OK. REPEAT the
self-
test. CLEAR the DTCs.
No
PROGRAM a new remote
transmitter to the vehicle. For
additional information, REFER
to Programming — Keyless
Entry Remote Transmitter .
REPEAT the self- test. CLEAR
the DTCs. If the problem still
remains, INSTALL a new GEM
and program the remote
transmitters to the vehicle. For
additional information, REFER
to Section 419 - 10 . REPEAT
the self- test. CLEAR the
DTCs. D5 CHECK THE GEM OUTPUT TO THE LUGGAGE
COMPARTMENT z
Trigger the GEM active command RELEASE to ON and
OFF.
z Did the luggage compartment release? Yes
INSTALL a new GEM. For
additional information, REFER
to
Section 419 - 10 . REPEAT
the self- test. CLEAR the
DTCs.
No
GO to D6 .
D6 CHECK CIRCUIT 931 (OG) FOR OPEN
z
Disconnect: Luggage Compartment Lid Release Relay.
z Measure the voltage between luggage compartment lid
release relay Pin 2, Circuit 931 (OG), harness side and
ground; and between luggage compartment lid release Yes
GO to
D7 .
No Klj . 15 ba
212003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

relay Pin 5 Circuit 931 (OG), harness side and ground
z Is the voltage greater than 10 volts? REPAIR Circuit 931 (OG).
REPEAT the self-
test. CLEAR
the DTCs. D7 BYPASS THE GEM AND RELAY CONTROL
z
Momentarily connect a 25A jumper wire between the
luggage compartment lid release relay Pin 3 and Pin 5.
z Did the luggage compartment lid release? Yes
GO to
D8 .
No
GO to D12 .
D8 CHECK LUGGAGE COMPARTMENT LID RELEASE
RELAY z
Carry out the luggage compartment lid release relay.
REFER to Wiring Diagrams Cell 149, Component
Testing.
z Is the luggage compartment lid release relay OK? Yes
GO to
D9 .
No
INSTALL a new luggage
compartment lid release relay.
REPEAT the self- test. CLEAR
the DTCs. D9 CHECK CIRCUIT 599 (PK/LG) FOR SHORT TO POWER
z
Disconnect: GEM C201c.
z Measure the voltage between GEM C201c Pin 25, Circuit
599 (PK/LG), harness side and ground.
z Is the voltage greater than 10 volts? Yes
REPAIR Circuit 599 (PK/LG).
REPEAT the self-
test. CLEAR
the DTCs.
No
GO to D10 .
D10 CHECK CIRCUIT 599 (PK/LG) FOR SHORT TO
GROUND z
Measure the resistance between GEM C201c Pin 25, Yes Klj . 16 ba
212003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Circuit 599 (PK/LG), harness side and ground.
z Is the resistance greater than 10,000 ohms? GO to
D11 .
No
REPAIR Circuit 599 (PK/LG).
REPEAT the self- test. CLEAR
the DTCs. D11 CHECK CIRCUIT 599 (PK/LG) FOR OPEN
z
Measure the resistance between GEM C201c Pin 25,
Circuit 599 (PK/LG), harness side and luggage
compartment lid release relay Pin 1, Circuit 599 (PK/LG),
harness side.
z Is the resistance less than 5 ohms? Yes
INSTALL a new GEM. For
additional information, REFER
to
Section 419 - 10 . REPEAT
the self- test. CLEAR the
DTCs.
No
REPAIR Circuit 599 (PK/LG).
REPEAT the self- test. CLEAR
the DTCs. D12 CHECK CIRCUIT 84 (VT/YE) FOR SHORT TO POWER
z
Disconnect: GEM C201c.
z Measure the voltage between luggage compartment lid
release relay Pin 3, Circuit 84 (VT/YE), harness side and
ground.
z Is the voltage greater than 10 volts? Yes
REPAIR Circuit 84 (VT/YE).
REPEAT the self-
test. CLEAR
the DTCs.
No
GO to D13 .
D13 CHECK CIRCUIT 84 (VT/YE) FOR OPEN
z
Disconnect: Luggage Compartment Lid Release Solenoid
C430.
z Measure the resistance between luggage compartment
lid release relay Pin 3, Circuit 84 (VT/YE), harness side
and luggage compartment lid release solenoid C430 Pin
2, Circuit 84 (VT/YE), harness side. Yes
GO to
D14 .
No
REPAIR Circuit 84 (VT/YE).
REPEAT the self- test. CLEAR
the DTCs. Klj . 17 ba
212003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST E: PANIC FUNCTION DOES NOT OPERATE
CORRECTLY z
Is the resistance less than 5 ohms? D14 CHECK CIRCUIT 1205 (BK) FOR OPEN
z
Measure the resistance between luggage compartment
lid release solenoid C430 Pin 1, Circuit 1205 (BK),
harness side and ground.
z Is the resistance less than 5 ohms? Yes
INSTALL a new luggage
compartment lid release
switch. REPEAT the self-test.
CLEAR the DTCs.
No
REPAIR Circuit 1205 (BK).
REPEAT the self- test. CLEAR
the DTCs. Test Step Result / Action to Take
E1 CHECK IGNITION STATES
z
Connect the diagnostic tool.
z Monitor the GEM PIDS IGN_KEY, IGN_A, IGN_S, and
IGN_R while cycling the ignition switch through the OFF,
ACC, RUN, START and key out positions.
z Do the PID values agree with the ignition switch
positions? Yes
GO to
E2 .
No
REFER to Section 413 -
09 .
E2 CHECK THE GEM PID LAST DATA RECEIVED FOR PANIC
z
Remove the ignition key from the ignition.
z Connect the diagnostic tool.
z Monitor the GEM PID LAST DATA RECEIVED while pressing
and releasing the luggage compartment, panic, lock, and
unlock buttons of the remote transmitter.
z Does LAST DATA RECEIVED match the button presses
of the remote transmitter? Yes
GO to
E3 .
No
GO to Pinpoint Test D .
E3 CHECK THE COURTESY LAMPS
z
Connect the diagnostic tool.
z Trigger the GEM active command COURTESYL ON and
OFF.
z Do the courtesy lamps illuminate and turn off? Yes
GO to
E4 .
No
REFER to Section 417 -
02 . TEST the system for Klj . 18 ba
212003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

normal operation.
E4 CHECK THE GEM OUTPUT TO THE HORN
z
Connect the diagnostic tool.
z Trigger the GEM active command HORN ON and OFF.
z Did the horn sound and turn off? Yes
GO to
E5 .
No
GO to E6 .
E5 CHECK THE GEM OUTPUT TO THE PARKING LAMPS
z
Connect the diagnostic tool.
z Trigger the GEM active command PARKLAMPS ON and
OFF.
z Did the parking lamps illuminate and turn off? Yes
INSTALL a new GEM. For
additional information,
REFER to
Section 419 -
10 . REPEAT the self-
test.
CLEAR the DTCs.
No
GO to E10 .
E6 CHECK CIRCUIT 6 (YE/LG) FOR SHORT TO POWER
z
Disconnect: Horn Relay.
z Disconnect: GEM C201c.
z Measure the voltage between GEM C201c Pin 12, Circuit 6
(YE/LG), harness side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
E7 .
No
REPAIR Circuit 6 (YE/LG).
REPEAT the self- test.
CLEAR the DTCs. E7 CHECK CIRCUIT 6 (YE/LG) FOR SHORT TO GROUND
z
Measure the resistance between GEM C201c Pin 12, Circuit
6 (YE/LG), harness side and ground.
z Is the resistance greater than 10,000 ohms? Yes
GO to
E8 .
No
REPAIR Circuit 6 (YE/LG).
REPEAT the self- test.
CLEAR the DTCs. E8 CHECK CIRCUIT 6 (YE/LG) FOR OPEN
z
Measure the resistance between GEM C201c Pin 12, Circuit
6 (YE/LG), harness side and horn relay Pin 1, Circuit 6
(YE/LG), harness side. Yes
GO to
E9 .
No
REPAIR Circuit 6 (YE/LG).
REPEAT the self- test.
CLEAR the DTCs. Klj . 19 ba
212003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Is the resistance less than 5 ohms? E9 CHECK THE HORN FOR NORMAL OPERATION
z
Depress the steering wheel horn switch.
z Did the horn sound? Yes
INSTALL a new GEM. For
additional information,
REFER to
Section 419 -
10 . REPEAT the self-
test.
CLEAR the DTCs.
No
REFER to Section 413 -
06 .
E10 CHECK CIRCUIT 1032 (WH/BK) FOR SHORT TO POWER
z
Disconnect: Parking Lamp Relay.
z Disconnect: GEM C201e.
z Measure the voltage between GEM C201e Pin 11, Circuit
1032 (WH/BK), harness side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
E11 .
No
REPAIR Circuit 1032
(WH/BK). REPEAT the
self- test. CLEAR the
DTCs. E11 CHECK CIRCUIT 1032 (WH/BK) FOR SHORT TO GROUND
z
Measure the resistance between GEM C201e Pin 11, Circuit
1032 (WH/BK), harness side and ground.
z Is the resistance greater than 10,000 ohms? Yes
GO to
E12 .
No
REPAIR Circuit 1032
(WH/BK). REPEAT the
self- test. CLEAR the
DTCs. E12 CHECK CIRCUIT 1032 (WH/BK) FOR OPEN
z
Measure the resistance between GEM C201e Pin 11, Circuit Yes Klj . 20 ba
212003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

1032 (WH/BK), harness side and parking lamp relay Pin 1,
Circuit 1032 (WH/BK), harness side.
z Is the resistance less than 5 ohms? GO to
E13 .
No
REPAIR Circuit 1032
(WH/BK). REPEAT the
self- test. CLEAR the
DTCs. E13 CHECK THE PARKING LAMPS FOR NORMAL
OPERATION z
Turn the parking lamps on with the headlamp switch.
z Did the parking lamps turn on and off with the headlamp
switch? Yes
INSTALL a new GEM. For
additional information,
REFER to
Section 419 -
10 . REPEAT the self-
test.
CLEAR the DTCs.
No
REFER to Section 417 -
01 . Klj . 21 ba
212003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

DIAGNOSIS AND TESTING
Wipers and Washers
Refer to Wiring Diagrams Cell
59 , Generic Electronic Module for schematic and connector
information.
Refer to Wiring Diagrams Cell 81 , Interval Wiper/Washer for schematic and connector information.
Principles of Operation
Multifunction Wipers
The front wiper/washer feature controls the speed of the front windshield wipers and the amount of
washer fluid sprayed on the front windshield when requested by the customer. There are five (5) wiper
modes: OFF, LOW, HIGH, INTERVAL, and WASH.
Wiper Motor Speeds HIGH and LOW
There are two wiper speeds, HIGH and LOW. When the GEM detects the ignition switch circuits are in
the RUN or ACC states, and the GEM detects a high or low speed request from the wiper mode
circuits, the GEM will activate the wiper ON and OFF and the wiper speed circuits accordingly.
Wiper Motor Speeds Interval
There are one to seven wiper speed intervals, ranging from 1.5 seconds to 20 seconds in delay time
respectively, which can be selected. When the GEM detects the ignition switch circuits are in the RUN
or ACC states, and the GEM detects an interval selection of 1 through 7 from the delay/wash circuits, the GEM will activate the wiper ON and OFF and the wiper speed circuits accordingly. SECTION 501-
16: Wipers and Washers 2003 Mustang Workshop Manual Special Tool(s)
Alternator, Regulator, Battery
and Starter Tester (ARBST) or
equivalent
010-
00725 73 Digital Multimeter or
equivalent
105-
R0051 Worldwide Diagnostic System
(WDS)
418-
F224
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool Klj . 1 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Washers
When the GEM detects the ignition switch circuits are in RUN or ACC states, and the GEM detects a
WASH request from the wiper delay/wash circuits, the GEM will activate the washer pump relay circuit
for as long as the request is present up to 10 seconds.
Activation of the washer pump when in INTERVAL or OFF is delayed until a wash request is active for
a minimum amount of time. In this scenario, the wash request must be present continuously for at least
210 ms. This allows a wash request that is present for less than 210 ms, to provide additional
functionality by initiating a single wipe, called "mist wipe". The mist wipe function is a single wipe at low
speed without activating the washer motor.
When in LOW or HIGH, any WASH request, regardless of the length of time it is present, will activate
the washer pump. When in INTERVAL or OFF mode, upon deactivation of the washer motor, this
feature shall provide two wipes at low speed before returning to the INTERVAL or OFF state as
defined by the inputs. These additional wipes are provided to clear residual washer fluid from the front
windshield.
Inspection and Verification
1. Verify the customer concern by operating the wiper/washer system.
2. Visually inspect for obvious signs of mechanical and electrical damage.
3. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the
diagnostic tool menu. If diagnostic tool does not communicate with the vehicle:
zCheck that the program card is correctly installed.
z Check the connections to the vehicle.
z Check the ignition switch position.
4. If diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If diagnostic tool responds with: zCKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section 418 -
00 .
z NO RESPONSE/NOT EQUIPPED for GEM, go to Pinpoint Test A.
z SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs),
erase the continuous DTCs and carry out self- test diagnostics for the GEM.
Visual Inspection Chart Mechanical Electrical
z
Hoses to windshield washer pump
z Wiper linkage z
CJB Fuse 39 (5A)
z CJB Fuse 26 (30A)
z Wiring harness
z Loose or corroded connector(s)
z Relays
z Motors
z Multifunction switch
z GEM Klj . 2 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

6. If the DTCs retrieved are related to the concern, go to GEM Diagnostic Trouble Code (DTC)
Index to continue diagnostics.
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.
GEM Diagnostic Trouble Code (DTC) Index GEM Diagnostic Trouble Code (DTC) Index DTC Description Source Action
B1217 Horn Relay Coil Circuit Failure GEM REFER to
Section 413 - 06 .
B1218 Horn Relay Coil Circuit Short to
Vbatt GEM REFER to
Section 413 - 06 .
B1312 Lamp Headlamp Input Circuit
Short to Battery GEM REFER to
Section 417 - 01 .
B1317 Battery Voltage High GEM REFER to
Section 414 - 00 .
B1318 Battery Voltage Low GEM REFER to
Section 414 - 00 .
B1322 Driver Door Ajar Circuit Short to
Ground GEM REFER to
Section 417 - 02 .
B1330 Passenger Door Ajar Circuit
Short to Ground GEM REFER to
Section 417 - 02 .
B1334 Decklid Ajar Rear Door Circuit
Short to Ground GEM REFER to
Section 417 - 02 .
B1339 Chime Input Request Circuit
Short to Battery (FOJ) GEM REFER to
Section 413 - 09 .
B1340 Chime Input Request Circuit
Short to Ground GEM REFER to
Section 413 - 09 .
B1342 ECU Is Defective GEM CLEAR the DTCs. Retrieve the DTCs. If DTC
B1342 is retrieved, INSTALL a new GEM. REFER to Section 419 - 10 .
B1353 Ignition Key-
In Circuit Open GEM REFER to
Section 413 - 09 .
B1359 Ignition Run/Acc Circuit Failure GEM REFER to
Section 211 - 05 .
B1396 Power Door Lock Circuit Short
to Battery GEM REFER to
Section 501 - 14B .
B1397 Power Door Unlock Circuit
Short to Battery GEM REFER to
Section 501 - 14B .
B1405 Driver Power Window Down
Circuit Short to Battery GEM REFER to
Section 501 - 11 .
B1408 Driver Power Window Up Circuit
Short to Battery GEM REFER to
Section 501 - 11 .
B1410 Driver Power Window Motor
Circuit Failure GEM REFER to
Section 501 - 11 .
B1426 Lamp Safety Belt Circuit Short
to Battery GEM REFER to
Section 413 - 01 .
B1428 Lamp Safety Belt Circuit Failure GEM REFER to
Section 413 - 01 .
B1431 Wiper Brake/Run Relay Circuit
Failure GEM GO to
Pinpoint Test B .
B1432 Wiper Brake/Run Relay Circuit GEM GO to
Pinpoint Test B . Klj . 3 ba
202003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...