Ford 2003 Mustang Workshop Manual page 3848

Measure the reistance between the GEM C201b pin 4, circuit
397 (BK/WH), harness side and ground.
Is the reistance 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: ALL DOOR LOCKS ARE INOPERATIVE
B1 CHECK POWER LOCK INPUTS TO THE GEM
Connect the diagnostic tool.
Monitor the GEM PIDS DR_LOCK, DR_UNLK, PD_LOCK,
PD_UNLK, while depressing the driver and passenger power door
lock and unlock switches.
Do the PID values agree with the switch positions?
B2 ISOLATE BETWEEN THE DRIVER AND PASSENGER POWER
DOOR LOCK SWITCHES
NOTE: This PID may not be supported in the normal scan tool PID
list. It can be located in the Function test — "Transmitter Tic/Data".
When this test is activated, the appropriate results may be obtained
when pressing the keyfob buttons.
Connect the diagnostic tool.
Monitor the GEM PIDS DR_LOCK and DR_UNLK, while
depressing the driver power door lock and unlock switches.
Do the PID values agree with the switch positions?
B3 CHECK CIRCUIT 326 (WH/VT) FOR VOLTAGE — DRIVER SIDE
Disconnect: Master Window/Door Lock Control Switch C508.
Measure the voltage between master window/door lock control
switch C508 Pin 3, Circuit 326 (WH/VT), harness side and ground.
Test Step
GO to A3 .
No
REPAIR the circuit(s) in
question. TEST the system
for normal operation.
Yes
REPAIR the circuit. TEST
the system for normal
operation.
No
REFER to Section 418-00
Result / Action to
Take
Yes
GO to B11 .
No
GO to B2 .
Yes
GO to B7 .
No
GO to B3 .
Yes
GO to B4 .
No
.