Ford 2003 Mustang Workshop Manual page 3337

Is the resistance greater than 10,000 ohms?
F8 ISOLATE OPEN ON CIRCUIT 85 (BN/LB)
Disconnect: Safety Belt Switch C323.
Enter the following diagnostic mode on the diagnostic tool:
GEM PID.
Connect a 10A fused jumper wire between safety belt
switch C323 pin 2, circuit 85 (BN/LB), harness side and
ground while monitoring GEM PID D_SBELT.
Does GEM PID GEM PID D_SBELT read OUT with
jumper wire installed?
F9 CHECK CIRCUIT 85 (BN/LB) FOR OPEN BETWEEN GEM
AND SEATBELT SWITCH
Disconnect: Safety Belt Switch C323.
Disconnect: GEM C201b.
Measure the resistance between GEM C201b pin 8, circuit
85 (BN/LB), harness side and safety belt switch C323 pin 2,
circuit 85 (BN/LB), harness side.
Is the resistance less than 5 ohms?
F10 CHECK CIRCUIT 1205 (BK) FOR AN OPEN CIRCUIT
BETWEEN SAFETY BELT SWITCH AND GROUND
Disconnect: Safety Belt Switch C323.
Measure the resistance between the safety belt switch
C323 pin 1, circuit 1205 (BK), harness side and ground.
Yes
GO to F10 .
No
GO to F9 .
Yes
GO to F11 .
No
REPAIR the circuit. CLEAR
the DTCs. TEST the system
for normal operation.
Yes
INSTALL a new safety belt
switch. REPEAT the self-
test. CLEAR the DTCs.