Ford 2003 Mustang Workshop Manual page 3670

Circuit 979 (RD/LB), harness side; then between front height motor
C382, Circuit 990 (YE/LB), harness side and seat regulator control
switch C360-5, Circuit 990 (YE/LB), harness side.
Is the resistance less than 5 ohms?
B3 CHECK CIRCUIT 979 (RD/LB) AND 990 (YE/LB) FOR A SHORT TO
GROUND
Measure the resistance between front height motor C382, Circuit
979 (RD/LB), harness side and ground and between front height
motor C382, Circuit 990 (YE/LB), harness side and ground.
Are the resistances greater than 10,000 ohms?
B4 CHECK THE UP POSITION INPUT
Connect: Seat Regulator Control Switch C360.
Measure the voltage between front height motor C382, Circuit 979
(RD/LB), harness side and ground.
Actuate the seat regulator control switch to the front UP position.
Is the voltage greater than 10 volts?
B5 CHECK THE DOWN POSITION INPUT
Measure the voltage between front height motor C382, Circuit 990
(YE/LB), harness side and ground.
control switch.
REFER to Switch—
Seat Regulator
Control . TEST the
system for normal
operation.
No
REPAIR the circuit.
TEST the system
for normal
operation.
Yes
GO to B4 .
No
REPAIR the circuit.
TEST the system
for normal
operation.
Yes
GO to B5 .
No
INSTALL a new
seat regulator
control switch.
REFER to Switch—
Seat Regulator
Control . TEST the
system for normal
operation.
Yes
INSTALL a new
seat track. REFER
to Seat Track .
TEST the system
for normal
operation.