window FORD MUSTANG 2003 Owner's Guide

Symptom Chart
Refer to the Wiring Diagrams for the connector numbers stated in pinpoint tests.
Symptom Chart Condition
Possible Sources Action
z No communication with the
generic electronic module
(GEM) z
Central junction box
(CJB) fuse 39 (5A).
z GEM.
z Circuitry. z
GO to Pinpoint Test A .
z All power windows are
inoperative — convertible z
Circuitry.
z CJB circuit breaker
43 (20A).
z Window regulator
control switch. z
GO to Pinpoint Test B .
z All power windows are
inoperative — coupe z
Circuitry.
z CJB circuit breaker
43 (20A).
z Window regulator
control switch. z
GO to Pinpoint Test C .
z A single power window is
inoperative — driver,
convertible z
Circuitry.
z CJB fuse 43 (20A).
z Ignition switch.
z Window regulator
motor.
z Window regulator
control switch.
z GEM. z
GO to Pinpoint Test D .
z A single power window is
inoperative — driver, coupe z
Circuitry.
z CJB fuse 43 (20A).
z Ignition switch.
z Window regulator
motor.
z Window regulator
control switch.
z GEM. z
GO to Pinpoint Test E .
z The one- touch down feature
is inoperative z
Circuitry.
z CJB fuse 43 (20A).
z Ignition switch.
z Window regulator
motor.
z Window regulator
control switch.
z GEM. z
For convertible,
GO to Pinpoint Test D .
z For coupe, GO to
Pinpoint Test E .
z A single power window is
inoperative — passenger z
Circuitry.
z Driver window
regulator control
switch.
z Window regulator
motor.
z Passenger window
regulator control
switch. z
GO to Pinpoint Test F .
z A single power window is zCircuitry. zGO to Pinpoint Klj . 5 ba
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST D: A SINGLE POWER WINDOW IS INOPERATIVE —
DRIVER, CONVERTIBLE z
Is the resistance less than 5 ohms? Test Step Result / Action to Take
D1 CHECK THE IGNITION SWITCH INPUT TO THE GEM
z
Select GEM PID IGN_A, IGN_R, IGN_S and IGN_KEY.
z Insert the ignition key in the ignition switch and turn to each
position while monitoring PIDs.
z Did the PID values agree with the ignition switch
positions? Yes
GO to
D2 .
No
REFER to Section 211 - 05
for ignition switch
diagnosis.
D2 CHECK THE DRIVER WINDOW REGULATOR CONTROL
SWITCH INPUT TO THE GEM z
Key in ON position.
z Enter the following diagnostic mode on the diagnostic tool:
GEM PID D_UP_SW and D_DN_SW.
z Actuate the driver window regulator control switch to the UP
and DOWN position.
z Did the PID values agree with the driver window regulator
control switch positions? Yes
GO to
D9 .
No
GO to D3 .
D3 CHECK THE POWER SUPPLY TO THE WINDOW
REGULATOR CONTROL SWITCH 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
D4 .
No
GO to D8 .
D4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
z
Measure the resistance between driver window regulator
control switch C537 pin 14, circuit 1205 (BK), harness side
and ground. Yes
GO to
D5 .
No
REPAIR the circuit. TEST
the system for normal
operation. Klj . 9 ba
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Is the resistance less than 5 ohms? D5 CHECK THE DRIVER WINDOW REGULATOR CONTROL
SWITCH z
Carry out the driver window regulator control switch
component test. Refer to the Wiring Diagrams Cell 149,
Component Testing.
z Did the driver window regulator control switch pass? Yes
GO to
D6 .
No
INSTALL a new driver
window regulator control
switch. REFER to
Switch — Window
Regulator Control in this
section. TEST the system
for normal operation. D6 CHECK CIRCUIT 226 (WH/BK) FOR A SHORT TO BATTERY
z
Key in OFF position.
z Disconnect: GEM C201a.
z Measure the voltage between GEM C201a pin 2, circuit 226
(WH/BK), harness side and ground.
z Key in ON position.
z Measure the voltage between GEM C201a pin 2, circuit 226
(WH/BK), harness side and ground.
z Is either voltage greater than 10 volts? Yes
REPAIR the circuit. TEST
the system for normal
operation.
No
GO to
D7 .
D7 CHECK CIRCUIT 991 (TN/LB) AND 992 (WH/BK) FOR AN
OPEN Klj . 10 ba
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Key in OFF position.
z Disconnect: GEM C201c.
z Measure the resistance between driver window regulator
control switch C537 pin 8, circuit 991 (TN/LB), harness side
and GEM C201a pin 3, circuit 991 (TN/LB), harness side.
z Measure the resistance between driver window regulator
control switch C537 pin 6, circuit 992 (WH/BK), harness side
and GEM C201c pin 14, circuit 992 (WH/BK), harness side.
z Are the resistances less than 5 ohms? Yes
INSTALL a new GEM.
REFER to
Section 419 -
10 . TEST the system for
normal operation.
No
REPAIR the circuit. TEST
the system for normal
operation. D8 CHECK CIRCUIT 400 (LB/BK) FOR AN OPEN
z
Key in OFF position.
z Disconnect: CJB Circuit Breaker 43 (20A).
z Measure the resistance between driver window regulator
control switch C537 pin 15, circuit 400 (LB/BK), harness side
and CJB circuit breaker 43 (20A) output pin, circuit 400
(LB/BK). Yes
REPAIR the power supply
to CJB circuit breaker 43
(20A). TEST the system
for normal operation.
No
REPAIR the circuit. TEST
the system for normal
operation. Klj . 11 ba
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Is the resistance less than 5 ohms? D9 CHECK THE GEM CONTROL OF THE DRIVER POWER
WINDOW z
Key in ON position.
z Enter the following diagnostic mode on the diagnostic tool:
GEM Active Command FRONT WINDOW CONTROL.
z Trigger DR DOWN ON.
z Did the driver window move down? Yes
INSTALL a new GEM.
REFER to
Section 419 -
10 . TEST the system for
normal operation.
No
GO to D10 .
D10 CHECK THE WINDOW REGULATOR MOTOR OPERATION
z
Disconnect: Driver Window Regulator Motor C518.
z Connect a 20 amp fused jumper wire between battery positive
and one pin of the window regulator motor (component side).
z Momentarily connect a jumper wire between second pin of the
window regulator motor and ground.
z Reverse the jumper wires on the window regulator motor.
z Did the window regulator motor operate in both
directions? Yes
GO to
D11 .
No
INSTALL a new window
regulator motor. REFER
to Motor — Window
Regulator in this section.
TEST the system for
normal operation. D11 CHECK CIRCUIT 992 (WH/BK) FOR AN OPEN BETWEEN
THE DRIVER WINDOW MOTOR AND THE WINDOW
REGULATOR CONTROL SWITCH z
Disconnect: Driver Window Regulator Control Switch C537.
z Measure the resistance between driver window regulator
control switch C537 pin 6, circuit 992 (WH/BK), harness side
and driver window regulator motor C518, circuit 992 (WH/BK),
harness side. Yes
GO to
D12 .
No
REPAIR the circuit. TEST
the system for normal
operation. Klj . 12 ba
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST E: A SINGLE POWER WINDOW IS INOPERATIVE —
DRIVER, COUPE z
Is the resistance less than 5 ohms? D12 CHECK CIRCUIT 226 (WH/BK) FOR AN OPEN
z
Disconnect: GEM C201a.
z Measure the resistance between GEM C201a pin 2, circuit
226 (WH/BK), harness side and driver window regulator motor
C518, circuit 226 (WH/BK), harness side.
z Is the resistance less than 5 ohms? Yes
GO to
D13 .
No
REPAIR the circuit. TEST
the system for normal
operation. D13 CHECK CIRCUIT 400 (LB/BK) FOR AN OPEN TO THE GEM
z
Key in OFF position.
z Disconnect: CJB Circuit Breaker 43 (20A).
z Measure the resistance between GEM C021a pin 4, circuit
400 (LB/BK), harness side and CJB circuit breaker 43 (20A)
output pin, circuit 400 (LB/BK).
z Is the resistance less than 5 ohms? Yes
INSTALL a new GEM.
REFER to
Section 419 -
10 . TEST the system for
normal operation.
No
REPAIR the circuit. TEST
the system for normal
operation. Test Step Result / Action to Take
E1 CHECK THE IGNITION SWITCH INPUT TO THE GEM
z
Select GEM PID IGN_A, IGN_R, IGN_S and IGN_KEY.
z Insert the ignition key in the ignition switch and turn to each Yes
GO to
E2 . Klj . 13 ba
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

position while monitoring PIDs.
z Did the PID values agree with the ignition switch positions? No
REFER to
Section 211 -
05 for ignition switch
diagnosis. E2 CHECK THE DRIVER WINDOW REGULATOR CONTROL
SWITCH INPUT TO THE GEM z
Key in ON position.
z Enter the following diagnostic mode on the diagnostic tool: GEM
PID D_UP_SW and D_DN_SW.
z Actuate the driver window regulator control switch to the UP and
DOWN position.
z Did the PID values agree with the driver window regulator
control switch positions? Yes
GO to
E9 .
No
GO to E3 .
E3 CHECK THE POWER SUPPLY TO THE WINDOW REGULATOR
CONTROL SWITCH 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
E4 .
No
GO to E8 .
E4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
z
Measure the resistance between driver window regulator control
switch C508 pin 7, circuit 1205 (BK), harness side and ground;
and between driver window regulator control switch C508 pin
12, circuit 1205 (BK), harness side and ground.
z Is the resistance less than 5 ohms? Yes
GO to
E5 .
No
REPAIR the circuit.
TEST the system for
normal operation. E5 CHECK THE DRIVER WINDOW REGULATOR CONTROL
SWITCH z
Carry out the driver window regulator control switch component
test. Refer to the Wiring Diagrams Cell 149, Component
Testing.
z Did the driver window regulator control switch pass? Yes
GO to
E6 .
No
INSTALL a new driver Klj . 14 ba
322003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...