FORD MUSTANG 2003 Workshop Manual

PINPOINT TEST C: THE POWER SEAT DOES NOT MOVE
VERTICALLY —
REAR z
Actuate the seat regulator control switch to the front DOWN position.
z Is the voltage greater than 10 volts? No
INSTALL a new
seat regulator
control switch.
REFER to
Switch —
Seat Regulator
Control . TEST the
system for normal
operation. Test Step Result / Action to
Take C1 CHECK THE MOTOR SUPPLY CIRCUITS
z
Disconnect: Rear Height Motor C363.
z NOTE: Make sure all connectors are connected on the seat.
z 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.
z Are the resistances less than 5 ohms? Yes
GO to
C3 .
No
GO to C2 .
C2 CHECK CIRCUIT 983 (RD/LG) AND 982 (YE/LG) FOR AN OPEN
z
Disconnect: Seat Regulator Control Switch C360.
z 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. 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. Klj . 5 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST D: THE POWER SEAT DOES NOT MOVE
HORIZONTALLY z
Is the resistance less than 5 ohms? C3 CHECK CIRCUIT 983 (RD/LG) AND 982 (YE/LG) FOR A SHORT TO
GROUND z
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.
z Are the resistances greater than 10,000 ohms? Yes
GO to
C4 .
No
REPAIR the circuit.
TEST the system
for normal
operation. C4 CHECK THE UP POSITION INPUT
z
Connect: Seat Regulator Control Switch C360.
z Measure the voltage between rear height motor C363, Circuit 983
(RD/LG), harness side and ground.
z Actuate the seat regulator control switch to the rear UP position.
z Is the voltage greater than 10 volts? Yes
GO to
C5 .
No
INSTALL a new
seat regulator
control switch.
REFER to Switch —
Seat Regulator
Control . TEST the
system for normal
operation. C5 CHECK THE DOWN POSITION INPUT
z
Measure the voltage between rear height motor C363, Circuit 982
(YE/LG), harness side and ground.
z Actuate the seat regulator control switch to the rear DOWN position.
z Is the voltage greater than 10 volts? Yes
INSTALL a new
seat track. REFER
to
Seat Track .
TEST the system
for normal
operation.
No
INSTALL a new
seat regulator
control switch.
REFER to Switch —
Seat Regulator
Control . TEST the
system for normal
operation. Klj . 6 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Test Step Result / Action to
Take D1 CHECK THE MOTOR SUPPLY CIRCUITS
z
Disconnect: Horizontal Motor C362.
z NOTE: Make sure all connectors are connected on the seat.
z Measure the resistance between horizontal motor C362, Circuit 981
(RD/WH), harness side and ground; and between horizontal motor
C362, Circuit 980 (YE/WH), harness side and ground.
z Are the resistances less than 5 ohms? Yes
GO to
D3 .
No
GO to D2 .
D2 CHECK CIRCUIT 981 (RD/WH) AND 980 (YE/WH) FOR AN OPEN
z
Disconnect: Seat Regulator Control Switch C360.
z Measure the resistance between horizontal motor C362, Circuit 981
(RD/WH), harness side and seat regulator control switch C360- 3,
Circuit 981 (RD/WH), harness side; then between horizontal motor
C362, Circuit 980 (YE/WH), harness side and seat regulator control
switch C360- 8, Circuit 980 (YE/WH), harness side.
z Is the resistance less than 5 ohms? 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. D3 CHECK CIRCUIT 981 (RD/WH) AND 980 (YE/WH) FOR A SHORT
TO GROUND z
Measure the resistance between horizontal motor C362, Circuit 981
(RD/WH), harness side and ground; and between horizontal motor
C362, Circuit 980 (YE/WH), harness side and ground.
z Are the resistances greater than 10,000 ohms? Yes
GO to
D4 .
No
REPAIR the circuit.
TEST the system
for normal
operation. Klj . 7 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST E: THE POWER LUMBAR IS INOPERATIVE D4 CHECK THE REARWARD POSITION INPUT
z
Connect: Seat Regulator Control Switch C360.
z Measure the voltage between horizontal motor C362, Circuit 981
(RD/WH), harness side and ground.
z Actuate the seat regulator control switch to the REARWARD
position.
z Is the voltage greater than 10 volts? Yes
GO to
D5 .
No
INSTALL a new
seat regulator
control switch.
REFER to Switch —
Seat Regulator
Control . TEST the
system for normal
operation. D5 CHECK THE FORWARD POSITION INPUT
z
Measure the voltage between horizontal motor C362, Circuit 980
(YE/WH), harness side and ground.
z Actuate the seat regulator control switch to the FORWARD position.
z Is the voltage greater than 10 volts? Yes
INSTALL a new
seat track. REFER
to Seat Track
.
TEST the system
for normal
operation.
No
INSTALL a new
seat regulator
control switch.
REFER to Switch —
Seat Regulator
Control . TEST the
system for normal
operation. Test Step Result / Action to Take
E1 CHECK THE LUMBAR COMPRESSOR OPERATION
z
Actuate the lumbar seat control switch to the inflate position.
z Did the lumbar compressor motor run? Yes
GO to
E6 .
No
GO to E2 .
E2 CHECK CIRCUIT 566 (DG)
z
Disconnect: Lumbar Seat Control Switch C361.
z Measure the voltage between lumbar seat control switch
C361, Circuit 566 (DG), harness side and ground. Yes
GO to
E3 .
No
REPAIR the circuit. TEST
the system for normal
operation. Klj . 8 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Is the voltage greater than 10 volts? E3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
z
Disconnect: Lumbar Motor C366.
z Measure the resistance between lumbar motor C366, Circuit
1205 (BK), harness side and ground.
z Is the resistance less than 5 ohms? Yes
GO to
E4 .
No
REPAIR the circuit. TEST
the system for normal
operation. E4 CHECK THE POWER SUPPLY TO THE LUMBAR MOTOR
z
Connect: Lumbar Seat Control Switch C361.
z Measure the voltage between lumbar motor C366, Circuit 51
(BK/WH), harness side and ground.
z Actuate the lumbar seat control switch the inflate position.
z Is the voltage greater than 10 volts? Yes
INSTALL a new lumbar
motor. REFER to
Lumbar Motor . TEST the system
for normal operation.
No
GO to E5 .
E5 CHECK CIRCUIT 51 (BK/WH) FOR AN OPEN
z
Disconnect: Lumbar Seat Control Switch C361.
z Measure the resistance between lumbar seat control switch
C361, Circuit 51 (BK/WH), harness side and lumbar motor
C366, Circuit 51 (BK/WH), harness side. Yes
INSTALL a new lumbar
seat control switch.
REFER to
Lumbar Control Switch . TEST the system
for normal operation.
No
REPAIR the circuit. TEST
the system for normal
operation. Klj . 9 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Is the resistance less than 5 ohms? E6 CHECK THE LUMBAR ADJUSTING SYSTEM
z
Actuate the lumbar seat control switch to the inflate position
while observing the seat backrest lumbar adjusting pad.
z Did the seat backrest lumbar adjusting pad inflate? Yes
GO to
E10 .
No
GO to E7 .
E7 CHECK THE SEAT BACKREST LUMBAR ADJUSTING PAD
z
Visually inspect the seat backrest lumbar adjusting pad.
z Is the seat backrest lumbar adjusting pad damaged? Yes
INSTALL a new seat
backrest lumbar adjusting
pad. REFER to
Lumbar Assembly . TEST the
system for normal
operation.
No
GO to E8 .
E8 CHECK AIR FLOW FROM LUMBAR COMPRESSOR
z
Disconnect the seat backrest lumbar adjusting hose from the
lumbar motor.
z Actuate the lumbar seat control switch to the inflate position
while feeling for air at the motor connection.
z Is air felt at the lumbar motor hose connection? Yes
GO to
E9 .
No
INSTALL a new lumbar
motor. REFER to Lumbar Motor . TEST the system
for normal operation. E9 CHECK THE AIR FLOW FROM THE LUMBAR SEAT
CONTROL SWITCH z
Reconnect the hose to the lumbar motor.
z Disconnect the seat backrest lumbar adjusting hose at the
lumbar seat control switch.
z Actuate the lumbar seat control switch to the inflate position.
z Is air felt at the seat backrest lumbar adjusting hose? Yes
GO to
E10 .
No
INSTALL a new seat
backrest lumbar adjusting
hose. TEST the system
for normal operation. E10 CHECK THE SYSTEM FOR LEAKS
z
Reconnect the hose at the lumbar seat control switch.
z Disconnect the seat backrest lumbar adjusting hose at the
seat backrest lumbar adjusting pad.
z Install an in- line pressure gauge on the hose.
z Actuate the lumbar seat control switch to the inflate position
until the gauge reads 34.47 kPa (5 psi). The system should
hold pressure for three hours.
z After three hours, is the pressure reading 32.41 kPa (4.7 Yes
The system is operating
correctly. TEST the
system for normal
operation.
No
GO to
E11 . Klj . 10 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

PINPOINT TEST F: THE POWER BOLSTER/LUMBAR IS
INOPERATIVE —
DRIVER psi) or more?
E11 CHECK THE SEAT BACKREST LUMBAR ADJUSTING PAD
FOR LEAKS z
Remove the in- line pressure gauge.
z Use a hand pump and inflate the seat backrest lumbar
adjusting pad to 34.47 kPa (5 psi). The seat backrest lumbar
adjusting pad should hold pressure for three hours.
z After three hours, is the pressure reading 32.41 kPa (4.7
psi) or more? Yes
INSTALL a new lumbar
seat control switch.
REFER to
Lumbar Control Switch . TEST the system
for normal operation.
No
INSTALL a new seat
backrest lumbar adjusting
pad. REFER to Lumbar Assembly . TEST the
system for normal
operation. Test Step Result / Action to Take
F1 CHECK THE BOLSTER/LUMBAR COMPRESSOR
OPERATION z
Actuate the bolster/lumbar seat control switches.
z Does the bolster/lumbar compressor motor run? Yes
GO to
F5 .
No
GO to F2 .
F2 CHECK CIRCUIT (BK) FOR VOLTAGE
z
Disconnect: Bolster/lumbar pump and solenoid module.
z Measure the voltage at bolster/lumbar pump and solenoid
module pin 1 (BK), harness side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
F3 .
No
REPAIR the circuit. TEST
the system for normal
operation. F3 CHECK CIRCUIT (LG) FOR AN OPEN
z
Measure the resistance between bolster/lumbar pump and
solenoid module pin 2, (LG), harness side and ground. Yes
GO to
F4 .
No
REPAIR the circuit. TEST
the system for normal
operation. Klj . 11 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Is the resistance less than 5 ohms? F4 CHECK THE BOLSTER/LUMBAR SEAT CONTROL
SWITCHES z
Carry out the bolster/lumbar seat control switch component
test.
Refer to Wiring Diagrams Cell 149 for schematic and
connector information.
z Did the seat control switches pass? Yes
INSTALL a new
bolster/lumbar pump and
solenoid module. REFER to
Lumbar Motor
. TEST the
system for normal
operation.
No
INSTALL a new
bolster/lumbar seat control
switch. REFER to Lumbar Control Switch . TEST the
system for normal
operation. F5 CHECK THE LUMBAR ADJUSTING SYSTEM
z
Actuate the bolster/lumbar seat control switches to the
inflate position while observing the seat backrest lumbar
adjusting pad, backrest bolster and cushion bolster.
z Did the seat bolsters/lumbar adjusting pads inflate? Yes
GO to
F9 .
No
For seat backrest lumbar,
GO to F6 . For seat
backrest bolster, GO to
F10 . For seat cushion
bolster, GO to F14 .
F6 CHECK THE SEAT BACKREST LUMBAR ADJUSTING PAD
z
Visually inspect the seat backrest lumbar adjusting pad.
z Is the seat backrest lumbar adjusting pad damaged? Yes
INSTALL a new seat
backrest lumbar adjusting
pad. REFER to
Lumbar Assembly . TEST the
system for normal
operation.
No
GO to F7 .
F7 CHECK AIR FLOW FROM LUMBAR COMPRESSOR
z
Disconnect the seat backrest lumbar adjusting hose from
the connection at the seat pivot bolt.
z Actuate the lumbar seat control switch to the inflate position
while feeling for air at the connection.
z Is air felt at the lumbar motor hose connection? Yes
GO to
F8 .
No
INSTALL a new
bolster/lumbar pump and
solenoid module. REFER to Klj . 12 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

Front Seat Cushion . TEST
the system for normal
operation. F8 CHECK THE SYSTEM FOR LEAKS
z
Reconnect the hose at the seat backrest lumbar pivot bolt.
z Disconnect the seat backrest lumbar adjusting hose at the
seat backrest lumbar adjusting pad.
z Install an in- line pressure gauge on the hose.
z Actuate the lumbar seat control switch to the inflate position
until the gauge reads 34.47 kPa (5 psi). The system should
hold pressure for three hours.
z After three hours, is the pressure reading 32.41 kPa (4.7
psi) or more? Yes
The system is operating
correctly. TEST the system
for normal operation.
No
GO to
F9 .
F9 CHECK THE SEAT BACKREST LUMBAR ADJUSTING PAD
FOR LEAKS z
Remove the in- line pressure gauge.
z Use a hand pump and inflate the seat backrest lumbar
adjusting pad to 34.47 kPa (5 psi). The seat backrest
lumbar adjusting pad should hold pressure for three hours.
z After three hours, is the pressure reading 32.41 kPa (4.7
psi) or more? Yes
INSTALL a new
bolster/lumbar pump and
solenoid module. REFER to
Lumbar Motor
. TEST the
system for normal
operation.
No
INSTALL a new seat
backrest lumbar adjusting
pad. REFER to Lumbar Assembly . TEST the
system for normal
operation. F10 CHECK THE SEAT BACKREST BOLSTER ADJUSTING
PADS z
Visually inspect the seat backrest bolster adjusting pad.
z Is the seat backrest bolster adjusting pad damaged? Yes
INSTALL a new seat
backrest bolster adjusting
pad. REFER to
Lumbar Assembly . TEST the
system for normal
operation.
No
GO to F11 .
F11 CHECK AIR FLOW FROM BOLSTER COMPRESSOR
z
Disconnect the seat backrest bolster adjusting hose from
the connection at the seat pivot bolt.
z Actuate the bolster seat control switch to the inflate position
while feeling for air at the connection.
z Is air felt at the lumbar motor hose connection? Yes
GO to
F12 .
No
INSTALL a new
bolster/lumbar pump and
solenoid module. REFER to
Lumbar Motor . TEST the
system for normal
operation. F12 CHECK THE SYSTEM FOR LEAKS
z
Reconnect the hose at the seat backrest bolster pivot bolt.
z Disconnect the seat backrest bolster adjusting hose at the
seat backrest bolster adjusting pad.
z Install an in- line pressure gauge on the hose. Yes
The system is operating
correctly. TEST the system
for normal operation. Klj . 13 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

z
Actuate the bolster seat control switch to the inflate position
until the gauge reads 34.47 kPa (5 psi). The system should
hold pressure for three hours.
z After three hours, is the pressure reading 32.41 kPa (4.7
psi) or more? No
GO to
F13 .
F13 CHECK THE SEAT BACKREST BOLSTER ADJUSTING
PAD FOR LEAKS z
Remove the in- line pressure gauge.
z Use a hand pump and inflate the seat backrest bolster
adjusting pad to 34.47 kPa (5 psi). The seat backrest bolster
adjusting pad should hold pressure for three hours.
z After three hours, is the pressure reading 32.41 kPa (4.7
psi) or more? Yes
INSTALL a new
bolster/lumbar pump and
solenoid module. REFER to
Lumbar Motor
. TEST the
system for normal
operation.
No
INSTALL a new seat
backrest bolster adjusting
pad. REFER to Lumbar Assembly . TEST the
system for normal
operation. F14 CHECK THE SEAT CUSHION BOLSTER ADJUSTING
PADS z
Visually inspect the seat cushion bolster adjusting pad.
z Is the seat cushion bolster adjusting pad damaged? Yes
INSTALL a new seat
cushion bolster adjusting
pad. REFER to
Lumbar Assembly . TEST the
system for normal
operation.
No
GO to F15 .
F15 CHECK AIR FLOW FROM BOLSTER COMPRESSOR
z
Disconnect the seat cushion bolster adjusting hose from the
connection at the seat pivot bolt.
z Actuate the bolster seat control switch to the inflate position
while feeling for air at the connection.
z Is air felt at the bolster motor hose connection? Yes
GO to
F16 .
No
INSTALL a new
bolster/lumbar pump and
solenoid module. REFER to
Lumbar Motor . TEST the
system for normal
operation. F16 CHECK THE SYSTEM FOR LEAKS
z
Reconnect the hose at the seat cushion bolster pivot bolt.
z Disconnect the seat cushion bolster adjusting hose at the
seat cushion bolster adjusting pad.
z Install an in- line pressure gauge on the hose.
z Actuate the bolster seat control switch to the inflate position
until the gauge reads 34.47 kPa (5 psi). The system should
hold pressure for three hours.
z After three hours, is the pressure reading 32.41 kPa (4.7
psi) or more? Yes
The system is operating
correctly. TEST the system
for normal operation.
No
GO to
F17 .
F17 CHECK THE SEAT CUSHION BOLSTER ADJUSTING
PAD FOR LEAKS z
Remove the in- line pressure gauge. Yes Klj . 14 ba
152003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...