Ford 2003 Mustang Workshop Manual page 3324

Is the resistance less than 5 ohms?
A3 CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO POWER
Measure the voltage between the GEM C201b pin 4, circuit
397 (BK/WH), harness side and ground.
Is any voltage present?
PINPOINT TEST B: THE KEY-IN-IGNITION CHIME DOES NOT
OPERATE CORRECTLY
B1 CHECK IGNITION STATES
Connect the diagnostic tool.
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
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.
Do the PID values agree with the ignition switch states?
B2 CHECK GEM INTERNAL TONE OPERATION
Enter the following diagnostic mode on the diagnostic tool:
GEM Active Command.
Trigger the GEM Active Command CHIME ON and OFF.
Does the chime operate correctly?
B3 CHECK GEM INPUT FROM DOOR AJAR CIRCUIT
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Monitor the GEM PID D_DR_SW, while opening and closing
the driver door.
Do the GEM PID D_DR_SW values indicate CLOSED and
AJAR correctly?
B4 CHECK GEM INPUT VOLTAGE FROM IGNITION SWITCH AT
Test Step
Yes
REPAIR the circuit. TEST
the system for normal
operation.
No
REFER to Section 418-00
Result / Action to Take
Yes
GO to B2 .
No
GO to B4 .
Yes
GO to B3 .
No
GO to B11 .
Yes
GO to B11 .
No
Go To Pinpoint Test D
.
.