Ford 2003 Mustang Workshop Manual page 3286

Key in ON position.
Enter the following diagnostic mode on the diagnostic tool:
Generic Electronic Module (GEM) PID.
Monitor the GEM PIDs IGN_KEY, IGN_S, IGN_R, and
IGN_A, while inserting the ignition key and cycling the
ignition switch through all the positions.
Did the PIDs agree with the ignition switch positions?
K2 CHECK IF THE GEM IS RECEIVING THE CORRECT
SAFETY BELT SWITCH STATUS
Monitor GEM PID D_SBELT while buckling and unbuckling
the driver safety belt.
Did the PID display IN with the safety belt buckled and
OUT with the safety belt unbuckled?
K3 CHECK THE GEM FOR INTERNAL OPEN OR SHORT
Key in OFF position.
Monitor the safety belt warning indicator when turning the
ignition from the OFF to the ON position.
Key in ON position.
Did the safety belt warning indicator illuminate for
approximately three seconds and turn off?
K4 DETERMINE IF SAFETY BELT INDICATOR CIRCUIT IS
SHORTED TO GROUND
Buckle the driver safety belt.
Is the safety belt indicator always on?
K5 CHECK IF THE GEM IS INTERNALLY GROUNDED
Key in OFF position.
Disconnect: GEM C201e.
Key in ON position.
Observe the safety belt warning indicator.
Is the safety belt warning indicator always on?
K6 CHECK CIRCUIT 450 (DG/LG) FOR A SHORT TO GROUND
Key in OFF position.
Disconnect: Instrument Cluster C220a.
Measure the resistance between the GEM C201e pin 26,
circuit 450 (DG/LG), harness side and ground.
Is the resistance greater than 10,000 ohms?
K7 CHECK CIRCUIT 450 (DG/LG) FOR A SHORT TO
BATTERY
Key in OFF position.
Disconnect: GEM C201e.
Disconnect: Instrument Cluster C220a.
Yes
GO to K3 .
No
REFER to Section 413-09
Yes
GO to K10 .
No
GO to K4 .
Yes
GO to K5 .
No
GO to K7 .
Yes
GO to K6 .
No
GO to K10 .
Yes
GO to K11 .
No
REPAIR the circuit. TEST
the system for normal
operation.
Yes
REPAIR the circuit. TEST
the system for normal
.