2003 FORD MUSTANG Workshop Manual

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Page 3497 of 4378

FORD MUSTANG 2003 Workshop Manual Symptom Chart
Pinpoint Tests
CAUTION: Before removing and installing the GEM or its connectors, disconnect the Output Circuit Failure
B2488 RF Side Repeater Lamp
Output Circuit Failure GEM RE

Page 3498 of 4378

FORD MUSTANG 2003 Workshop Manual battery. Failure to follow this caution will result in the GEM storing many erroneous DTCs and
may result in the GEM exhibiting erratic operation after installation.
CAUTION: Be careful when probin

Page 3499 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST B: THE COURTESY LAMPS ARE INOPERATIVE �z
Is the resistance less than 5 ohms? A3 CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO POWER
�z
Measure the voltage between GEM C201b pin 2, circuit 39

Page 3500 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Monitor the GEM PID DECKLID, while opening and closing
the luggage compartment lid.
�z Does the GEM PID DECKLID agree with the dome switch
position? Yes
GO to
B5 .
No
GO to B16 .
B5 CHE

z
Monitor the GEM PID DECKLID, while opening and closing
the luggage compartment lid.
z Does the GEM PID DECKLID agree with the dome switch
position? Yes
GO to
B5 .
No
GO to B16 .
B5 CHECK THE COURTESY LAMP CIRCUITS
z
Close the luggage compartment lid and all doors are closed.
z Turn the dome and map lamp switches to the off position.
z Are the courtesy lamps illuminated? Yes
GO to
B12 .
No
GO to B6 .
B6 CHECK THE GEM CONTROL OF THE COURTESY LAMPS
z
Trigger the GEM active command COURTESYL ON and then
OFF.
z Do the courtesy lamps illuminate when the GEM active
command COURTESYL ON is triggered, and go out when
the GEM active command COURTESYL OFF is triggered? Yes
INSTALL a new GEM. For
additional information,
REFER to
Section 419 -
10 . REPEAT the self-
test.
CLEAR the DTCs.
No
GO to B7 .
B7 CHECK THE GEM FOR AN INTERNAL FAULT
z
Trigger the GEM active command COURTESYL ON, then
OFF.
z Can an audible click be heard coming from the GEM,
while triggering the active command COURTESYL ON? Yes
GO to
B8 .
No
INSTALL a new GEM. For
additional information,
REFER to Section 419 -
10 . REPEAT the self-
test.
CLEAR the DTCs. B8 CHECK CIRCUIT 1034 (BK/WH) FOR VOLTAGE
z
Disconnect the dome lamp C929 (coupe) or map lamp C978
(convertible)
z Trigger the GEM active command COURTESYL ON.
z Measure the voltage between dome/map lamp C929 (coupe)
Pin 3 or map lamp C978 (convertible) Pin 4, Circuit 1034
(BK/WH), harness side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
B11 .
No
GO to B9 .
B9 CHECK CIRCUIT 1006 (DG/WH) FOR OPEN
NOTE:
Verify battery voltage at CJB Fuse 7 (20A) before
carrying out this test.
z Disconnect: GEM C201a.
z Measure the voltage between GEM C201a Pin 1, Circuit 1006
(DG/WH), harness side and ground. Yes
GO to
B10 .
No
REPAIR the circuit.
REPEAT the self- test.
CLEAR the DTCs. Klj . 8 ba
162003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Page 3501 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the voltage greater than 10 volts? B10 CHECK CIRCUIT 1034 (BK/WH) FOR OPEN
�z
Disconnect: GEM C201c.
�z Measure the resistance between GEM C201c Pin 3, Circuit
1034 (BK/WH), harness side and

Page 3502 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Is the voltage greater than 10 volts? B13 CHECK THE COURTESY LAMP OPERATION —
MONITOR
THE GEM PID DOMESW �z
Monitor the GEM PID DOMESW, while moving the interior
lamp switch from the OFF to t

Page 3503 of 4378

FORD MUSTANG 2003 Workshop Manual B17 CHECK LUGGAGE COMPARTMENT SOLENOID FOR
SHORT TO GROUND �z
Key in OFF position.
�z Disconnect: Luggage Compartment Solenoid C430.
�z Monitor the GEM PID DECKLID.
�z Does the GEM PID DECKLID in

Page 3504 of 4378

FORD MUSTANG 2003 Workshop Manual PINPOINT TEST C: THE DEMAND LIGHTING IS INOPERATIVE �z
Is the resistance less than 5 ohms? CLEAR the DTCs.
B21 CHECK GROUND CIRCUIT 1205 (BK) FOR OPEN
�z
Measure the resistance between luggage com

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