Ford 2003 Mustang Workshop Manual page 3725

Is the resistance less than 5 ohms?
D9 CHECK THE GEM CONTROL OF THE DRIVER POWER
WINDOW
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool:
GEM Active Command FRONT WINDOW CONTROL.
Trigger DR DOWN ON.
Did the driver window move down?
D10 CHECK THE WINDOW REGULATOR MOTOR OPERATION
Disconnect: Driver Window Regulator Motor C518.
Connect a 20 amp fused jumper wire between battery positive
and one pin of the window regulator motor (component side).
Momentarily connect a jumper wire between second pin of the
window regulator motor and ground.
Reverse the jumper wires on the window regulator motor.
Did the window regulator motor operate in both
directions?
D11 CHECK CIRCUIT 992 (WH/BK) FOR AN OPEN BETWEEN
THE DRIVER WINDOW MOTOR AND THE WINDOW
REGULATOR CONTROL SWITCH
Disconnect: Driver Window Regulator Control Switch C537.
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
INSTALL a new GEM.
REFER to Section 419-
10 . TEST the system for
normal operation.
No
GO to D10 .
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.
Yes
GO to D12 .
No
REPAIR the circuit. TEST
the system for normal
operation.