2003 FORD MUSTANG key

5.
NOTE: The steering wheel has been removed for clarity.
Remove the upper and lower steering column shrouds. 1. Remove the screws.
2. Remove the lower steering column shroud.
3. Remove the upper steering column shroud.
6. Remove the instrument panel steering column opening cover reinforcement. 1. Remove the bolts.
2. Remove the instrument panel steering column opening cover reinforcement.
7. NOTE: The steering wheel has been removed for clarity.
Remove the anti- theft transceiver module.
1. Remove the screw from the bottom of the transceiver module.
2. NOTE: Only apply pressure or leverage below the key cylinder lower rib.
Disconnect the electrical connector and remove the module. Klj . 2 ba
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DESCRIPTION AND OPERATION
Module Controlled Functions
The generic electronic module (GEM)(14B205) is the only multifunction control module on this vehicle.
The GEM controls the following functions:
zwarning chimes and warning lamps
z one- touch down window
z windshield washers and wipers
z battery saver
z illuminated entry with keyless remote entry
z interior lighting
SECTION 419-
10: Multifunction Electronic Control Modules 2003 Mustang Workshop Manual Klj . 1 ba
12003 Mustang Workshop Manual
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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-
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DIAGNOSIS AND TESTING
Glass, Frames and Mechanisms
Refer to Wiring Diagrams Cell
100 , Power Windows for schematic and connector information.
Refer to Wiring Diagrams Cell 56 , Rear Window Defrost for schematic and connector information.
Principles of Operation
Power Window Control
NOTE: Battery power and ground must be removed before disconnecting the GEM connectors to
avoid setting false DTCs.
The driver power window one- touch down operation is controlled by the generic electronic module
(GEM). This feature functions only when the ignition switch is in the RUN or ACCY positions. The GEM
determines ignition switch position by monitoring the key- in ignition, RUN/ACCY and RUN/START
circuits. The one-touch down operation is requested of the GEM by momentarily pressing the driver
window regulator control switch DOWN for 62 ms to 320 ms. The GEM uses the initial voltage input
from the down switch to begin the one- touch down operation. If the voltage input was less than 320
ms, the GEM will maintain the voltage supply to the motor down circuit. The GEM will maintain the
operation until:
zseven seconds expires.
z motor stall is detected by monitoring the current draw.
z a voltage input is received by the GEM on either the up or down switch circuits.
The ground for one- touch down operation does not pass through the GEM. The ground is supplied
through the driver window regulator control switch as with normal operation. If the GEM continues to
see voltage on the down circuit for more than 320 ms after initial activation the GEM will not effect
operation. The down circuit through the GEM is a direct connection to the motor in its normal state.
This allows the driver window regulator control switch to control the motor for normal operation.
The passenger window motors are hardwired directly to the window regulator control switches. SECTION 501-
11: Glass, Frames and Mechanisms 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent
diagnostic tool 73III Automotive Meter
105-
R0057 or equivalent Klj . 1 ba
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Short to Battery
B1317 Battery Voltage High GEM GO to
Section 414 - 00 .
B1318 Battery Voltage Low GEM GO to
Section 414 - 00 .
B1322 Door Ajar Driver Circuit Short
to Ground GEM GO to
Section 417 - 02 .
B1330 Door Ajar Passenger Circuit
Short to Ground GEM GO to
Section 417 - 02 .
B1334 Decklid Ajar Rear Door
Circuit Short to Ground GEM GO to
Section 417 - 02 .
B1339 Chime Input Request Circuit
Short to Battery GEM GO to
Section 413 - 09 .
B1340 Chime Input Request Circuit
Short to Ground GEM GO to
Section 413 - 09 .
B1342 ECU is Defective GEM CLEAR the DTC. RETRIEVE the DTCs. If DTC
B1342 is retrieved, INSTALL a new GEM. REFER to
Section 419
- 10 .
B1353 Ignition Key-
in Circuit Open GEM GO to
Section 413 - 09 .
B1359 Ignition RUN/ACC Circuit
Failure GEM GO to
Section 211 - 05 .
B1396 Power Door Lock Circuit
Short to Battery GEM GO to
Section 501 - 14B .
B1397 Power Door Unlock Circuit
Short to Battery GEM GO to
Section 501 - 14B .
B1405 Power Window Driver Down
Circuit Short to Battery GEM GO to
Pinpoint Test D for convertible or
Pinpoint Test E for coupe.
B1408 Power Window Driver Up
Circuit Short to Battery GEM GO to
Pinpoint Test D for convertible or
Pinpoint Test E for coupe.
B1410 Power Window Driver Motor
Circuit Failure GEM GO to
Pinpoint Test D for convertible or
Pinpoint Test E for coupe.
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
Section 501 - 16 .
B1432 Wiper Brake/run Relay Circuit
Short to Battery GEM GO to
Section 501 - 16 .
B1434 Wiper High/low Speed Relay
Coil Circuit Failure GEM GO to
Section 501 - 16 .
B1436 Wiper High/low Speed Relay
Coil Circuit Short to Battery GEM GO to
Section 501 - 16 .
B1438 Wiper Mode Select Switch
Circuit Failure GEM GO to
Section 501 - 16 .
B1441 Wiper Mode Select Switch
Circuit Short to Ground GEM GO to
Section 501 - 16 .
B1446 Wiper Park Sense Circuit
Failure GEM GO to
Section 501 - 16 .
B1448 Wiper Park Sense Circuit
Short to Battery GEM GO to
Section 501 - 16 . Klj . 3 ba
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Pinpoint Tests
PINPOINT TEST A: NO COMMUNICATION WITH THE GENERIC
ELECTRONIC MODULE (GEM) inoperative —
rear,
convertible only z
Window regulator
motor.
z Driver window
regulator control
switch. Test G .
z The defrost system is
inoperative z
BJB fuse HTD BL
(30A).
z CJB fuse 23 (15A).
z Circuitry.
z Instrument cluster
module (ICM).
z Rear window
defrost switch.
z Heated rear
window grid. z
GO to Pinpoint Test H .
z The defrost system will not
shut off automatically z
Circuit.
z ICM.
z Rear window
defrost switch. z
GO to Pinpoint Test I .
Test Step Result / Action to Take
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to
use the correct probe adapter(s) may damage the connector. A1 CHECK THE GENERIC ELECTRONIC MODULE (GEM)
POWER SUPPLY z
Key in OFF position.
z Disconnect: Generic Electronic Module (GEM) C201a.
z Disconnect: GEM C201b.
z Key in ON position.
z Using the following table, measure the voltage between the
GEM, harness side and ground.
z Are the voltages greater than 10 volts? Connector Pin Circuit
C201a 4 400 (LB/BK)
C201a 1 1006 (DG/WH)
C201b 2 1001 (WH/YE)
C201b 3 193 (YE/LG) Yes
GO to
A2 .
No
REPAIR the circuit(s) in
question. TEST the system
for normal operation. A2 CHECK THE GEM GROUND CIRCUIT 397 (BK/WH) FOR
OPEN z
Key in OFF position.
z Measure the resistance between the GEM C201b pin 4,
circuit 397 (BK/WH), harness side and ground. Yes
GO to
A3 .
No Klj . 6 ba
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PINPOINT TEST B: ALL POWER WINDOWS ARE INOPERATIVE —
CONVERTIBLE z
Is the resistance less than 5 ohms? REPAIR the circuit(s) in
question. TEST the system
for normal operation.
A3 CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO POWER
z
Measure the voltage between the GEM C201b pin 4, circuit
397 (BK/WH), harness side and ground.
z Is any voltage present? Yes
REPAIR the circuit. TEST
the system for normal
operation.
No
REFER to
Section 418 - 00 .
Test Step Result / Action to Take
B1 CHECK THE POWER SUPPLY TO THE WINDOW
REGULATOR CONTROL SWITCH z
Key in OFF position.
z Disconnect: Driver Window Regulator Control Switch
C537.
z Key in ON position.
z Measure the voltage between driver window regulator
control switch C537 pin 15, circuit 400 (LB/BK), harness
side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
B2 .
No
REPAIR the circuit. TEST the
system for normal operation. B2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
z
Measure the resistance between driver window regulator Yes Klj . 7 ba
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PINPOINT TEST C: ALL POWER WINDOWS ARE INOPERATIVE —
COUPE control switch C537 pin 14, circuit 1205 (BK), harness
side and ground.
z Is the resistance less than 5 ohms? INSTALL a new driver window
regulator control switch.
REFER to
Switch — Window
Regulator Control in this
section. TEST the system for
normal operation.
No
REPAIR the circuit. TEST the
system for normal operation. Test Step Result / Action to Take
C1 CHECK THE POWER SUPPLY TO THE WINDOW
REGULATOR CONTROL SWITCH z
Key in OFF position.
z Disconnect: Driver Window Regulator Control Switch
C508.
z Key in ON position.
z Measure the voltage between driver window regulator
control switch C508 pin 10, circuit 400 (LB/BK), harness
side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
C2 .
No
REPAIR the circuit. TEST the
system for normal operation. C2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
z
Measure the resistance between driver window regulator
control switch C508 pin 14, circuit 1205 (BK), harness
side and ground. Yes
INSTALL a new driver window
regulator control switch.
REFER to
Switch — Window
Regulator Control in this
section. TEST the system for
normal operation.
No
REPAIR the circuit. TEST the
system for normal operation. Klj . 8 ba
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