Ford 2003 Mustang Workshop Manual page 3671

Actuate the seat regulator control switch to the front DOWN position.
Is the voltage greater than 10 volts?
PINPOINT TEST C: THE POWER SEAT DOES NOT MOVE
VERTICALLY — REAR
C1 CHECK THE MOTOR SUPPLY CIRCUITS
Disconnect: Rear Height Motor C363.
NOTE: Make sure all connectors are connected on the seat.
Measure the resistance between rear height motor C363, Circuit 983
(RD/LG), harness side and ground and between rear height motor
C363, Circuit 982 (YE/LG), harness side and ground.
Are the resistances less than 5 ohms?
C2 CHECK CIRCUIT 983 (RD/LG) AND 982 (YE/LG) FOR AN OPEN
Disconnect: Seat Regulator Control Switch C360.
Measure the resistance between rear height motor C363, Circuit 983
(RD/LG), harness side and seat regulator control switch C360-1,
Circuit 983 (RD/LG), harness side; then between rear height motor
C363, Circuit 982 (YE/LG), harness side and seat regulator control
switch C360-6, Circuit 982 (YE/LG), harness side.
Test Step
No
INSTALL a new
seat regulator
control switch.
REFER to Switch—
Seat Regulator
Control . TEST the
system for normal
operation.
Result / Action to
Take
Yes
GO to C3 .
No
GO to C2 .
Yes
INSTALL a new
seat regulator
control switch.
REFER to Switch—
Seat Regulator
Control . TEST the
system for normal
operation.
No
REPAIR the circuit.
TEST the system
for normal
operation.