Ford 2003 Mustang Workshop Manual page 3336

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?
F2 DETERMINE IF THE GEM IS RECEIVING CORRECT
SAFETY BELT SWITCH STATUS
Key in ON position.
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Monitor the GEM PID D_SBELT while buckling and
unbuckling the driver safety belt.
Does the GEM PID D_SBELT read OUT and IN
correctly?
F3 CHECK THE 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?
F4 CHECK THE SAFETY BELT WARNING LAMP OPERATION
Cycle the ignition switch from OFF to RUN while monitoring
the instrument cluster safety belt indicator lamp.
Does instrument cluster safety belt indicator lamp
illuminate for approximately three seconds?
F5 DETERMINE IF CIRCUIT 85 (BN/LB) IS OPEN OR
SHORTED TO GROUND
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Monitor the GEM PID D_SBELT, while buckling and
unbuckling the driver safety belt.
Does the GEM PID D_SBELT value indicate OUT with
the driver safety belt buckled?
F6 ISOLATE THE SHORT TO GROUND ON CIRCUIT 85
(BN/LB)
Disconnect: Safety Belt Switch C323.
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Monitor the GEM PID D_SBELT.
Does the GEM PID D_SBELT value indicate IN?
F7 CHECK CIRCUIT 85 (BN/LB) FOR A SHORT TO GROUND
BETWEEN GEM AND SAFETY BELT SWITCH
Disconnect: GEM C201d.
Measure the resistance between GEM C201d pin 8, circuit
85 (BN/LB), harness side and ground.
Yes
GO to F3 .
No
GO to F5 .
Yes
GO to F4 .
No
GO to F11 .
Yes
GO to F11 .
No
REFER to Section 413-01
Yes
GO to F6 .
No
GO to F8 .
Yes
INSTALL a new safety belt
switch. REPEAT the self-
test. CLEAR the DTCs.
No
GO to F7 .
Yes
GO to F11 .
No
REPAIR the circuit. REPEAT
the self-test. CLEAR the
DTCs.
.