key FORD MUSTANG 2003 Workshop Manual

PINPOINT TEST B: THE LOW BEAMS ARE INOPERATIVE z
Measure the resistance between headlamp switch C205 Pin
H, Circuit 15 (RD/YE), harness side and multifunction switch
C202a Pin 15, Circuit 15 (RD/YE), harness side.
z Is the resistance less than 5 ohms? RECONNECT headlamp
switch C205. GO to
A3 .
No
REPAIR the circuit. TEST
the system for normal
operation. A3 CHECK THE VOLTAGE TO THE MULTIFUNCTION SWITCH
z
Place the headlamp switch in the ON position.
z Measure the voltage between multifunction switch C202a
Pin 15, Circuit 15 (RD/YE), harness side and ground.
z Is the voltage greater than 10 volts? Yes
INSTALL a new
multifunction switch;
REFER to
Section 211 - 05 .
TEST the system for
normal operation.
No
INSTALL a new headlamp
switch; REFER to Lamp Switch — Headlamp in this
section. TEST the system
for normal operation. Test Step Result / Action to Take
B1 CHECK THE VOLTAGE TO CJB FUSE 4 (7.5A) AND CJB
FUSE 10 (7.5A) z
Key in OFF position.
z Place the multifunction switch in the low beam position.
z Remove Fuse 4 (7.5A) and Fuse 10 (7.5A) from the CJB.
z Place the headlamp switch in the ON position.
z Measure the voltage between the following CJB fuse
terminals and ground:
„Fuse 4 connector.
„ Fuse 10 connector. Yes
Go To Pinpoint Test D
.
No
GO to B2 . Klj . 3 ba
82003 Mustang Workshop Manual
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PINPOINT TEST E: ONE HIGH BEAM HEADLAMP IS INOPERATIVE
PINPOINT TEST F: THE HEADLAMPS ARE ON CONTINUOUSLY
Test Step Result / Action to Take
E1 CHECK THE VOLTAGE TO THE INOPERATIVE HEADLAMP
BULB z
Key in OFF position.
z Disconnect: Inoperative Headlamp.
z Place the headlamp switch in the ON position.
z Place the multifunction switch in the high beam position.
z Measure the voltage between LH headlamp C1021 Pin 2,
Circuit 12 (LG/BK), or RH headlamp C1041 Pin 2, Circuit 12
(LG/BK), harness side and ground.
z Is the voltage greater than 10 volts? Yes
INSTALL a new headlamp
bulb; REFER to
Bulb —
Headlamp in this section.
TEST the system for
normal operation.
No
REPAIR the circuit. TEST
the system for normal
operation. Test Step Result / Action to Take
F1 CHECK THE HEADLAMP SWITCH
z
Key in OFF position.
z Disconnect: Headlamp Switch C205.
z Are the headlamps on? Yes
GO to
F2 .
No
INSTALL a new headlamp
switch; REFER to Lamp Switch — Headlamp in this
section. TEST the system for
normal operation. F2 CHECK THE MULTIFUNCTION SWITCH
z
Disconnect: Multifunction Switch C202a.
z Are the headlamps on? Yes
GO to
F4 .
No
GO to F3 .
F3 CHECK CIRCUIT 15 (RD/YE) FOR SHORT TO POWER
z
Measure the voltage between multifunction switch
C202a Pin 15, Circuit 15 (RD/YE), harness side and
ground. Yes
REPAIR the circuit. TEST the
system for normal operation.
No
INSTALL a new multifunction
switch; REFER to
Section 211 -
05 . TEST the system for
normal operation. Klj . 6 ba
82003 Mustang Workshop Manual
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PINPOINT TEST I: THE STOPLAMPS ARE ON CONTINUOUSLY z
If the high mounted stoplamp is inoperative, measure the voltage
between the inoperative high mounted stoplamp C475 (C4199 for
Cobra) pin 1, circuit 569 (DG), harness side and ground while
pressing the brake pedal.
z Is the voltage greater than 10 volts? operation.
If rear stoplamp, GO to
H2
.
H2 CHECK CIRCUIT 9 (LG/OG) OR 5 (OG/LB) FOR AN OPEN
z
Disconnect: Multifunction Switch C202b.
z Measure the resistance between the inoperative stoplamp
connector and multifunction switch C202b pin 9, circuit 9
(LG/OG) (LH), or C202b pin 5, circuit 5 (OG/LB) (RH).
z Is the resistance less than 5 ohms? Yes
INSTALL a new
multifunction switch.
REFER to
Section 211 - 05 . TEST the
system for normal
operation.
No
REPAIR the circuit in
question. TEST the
system for normal
operation. Test Step Result / Action to Take
I1 CHECK THE BRAKE PEDAL
POSITION (BPP) SWITCH z
Key in OFF position.
z Disconnect: BPP Switch
C278.
z Do the stoplamps continue
to illuminate? Yes
GO to
I2 .
No
INSTALL a new BPP switch. REFER to Lamp Switch —
Brake Pedal Position (BPP) . TEST the system for normal Klj . 3 ba
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Pinpoint Tests
PINPOINT TEST J: THE TURN SIGNAL LAMPS ARE NEVER ON z
Electronic flasher.
z The hazard
flasher lamps are
never on z
Central junction
box (CJB) fuse 13
(15A).
z Circuitry.
z Multifunction
switch.
z Electronic flasher. z
Go To Pinpoint Test K .
z One turn
signal/hazard
lamp is never on z
Turn
signal/hazard
flasher lamp.
z Circuitry. z
REPAIR inoperative turn
signal/hazard flasher lamp
circuit
„LF Circuit 3 (LG/WH).
„ RF Circuit 2 (WH/LB).
„ LR Circuit 9 (LG/OG).
„ RR Circuit 5 (OG/LB).
z The turn signal
lamps are always
on z
Multifunction
switch. z
INSTALL a new multifunction
switch; REFER to Section 211 -
05 . TEST the system for
normal operation.
z The hazard
flasher lamps are
always on z
Multifunction
switch. z
INSTALL a new multifunction
switch; REFER to Section 211 -
05 . TEST the system for
normal operation. Test Step Result / Action to
Take J1 CHECK THE VOLTAGE TO THE ELECTRONIC FLASHER
z
Disconnect: Electronic Flasher C2141.
z Key in ON position.
z Measure the voltage between the following electronic flasher
C2141 circuits, harness side and ground.
„Pin 2, Circuit 1039 (BK/YE).
„ Pin 3, Circuit 383 (RD/WH).
z Are the voltages greater than 10 volts? Yes
GO to
J2 .
No
REPAIR the circuit in
question. TEST the
system for normal
operation. J2 CHECK CIRCUIT 44 (LB)
z
Key in OFF position. Yes Klj . 2 ba
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Pinpoint Tests
PINPOINT TEST L: THE PARKING, REAR OR LICENSE LAMPS ARE
INOPERATIVE
PINPOINT TEST M: ONE OR MORE PARKING, REAR OR LICENSE
LAMP(S) IS INOPERATIVE
Test Step Result / Action to Take
L1 CHECK THE VOLTAGE TO THE HEADLAMP SWITCH
z
Disconnect: Headlamp Switch C205.
z Measure the voltage between headlamp switch C205 Pin
B2, Circuit 195 (TN/WH), harness side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
L2 .
No
REPAIR the circuit. TEST the
system for normal operation. L2 CHECK CIRCUIT 14 (BN) FOR OPEN
z
Measure the resistance between headlamp switch C205
Pin R, Circuit 14 (BN), harness side and ground.
z Is the resistance less than 5 ohms? Yes
INSTALL a new headlamp
switch; REFER to
Lamp Switch — Headlamp . TEST the
system for normal operation.
No
REPAIR the circuit. TEST the
system for normal operation. Test Step Result / Action to Take
M1 CHECK THE VOLTAGE TO THE INOPERATIVE
LAMP(S) z
Key in OFF position.
z Disconnect: Inoperative Lamp.
z Place the headlamp switch in the parking lamps
ON position.
z Measure the voltage between inoperative lamp
connector Circuit 14 (BN), harness side and
ground.
z Is the voltage greater than 10 volts? Yes
REPAIR Circuit 1205 (BK) for an open.
TEST the system for normal operation.
No
REPAIR the circuit. TEST the system
for normal operation. Klj . 2 ba
32003 Mustang Workshop Manual
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PINPOINT TEST N: THE PARKING, REAR OR LICENSE LAMPS ARE
ON CONTINUOUSLY
Test Step Result / Action to Take
N1 CHECK THE HEADLAMP
SWITCH z
Key in OFF position.
z Disconnect: Headlamp
Switch C205.
z Key in ON position.
z Are the parking, rear or
licences lamps on? Yes
REPAIR Circuit 14 (BN) for a short to battery. TEST the
system for normal operation.
No
INSTALL a new headlamp switch; REFER to
Lamp Switch — Headlamp . TEST the system for normal operation. Klj . 3 ba
32003 Mustang Workshop Manual
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PINPOINT TEST P: THE INDIVIDUAL FOG LAMP IS INOPERATIVE z
Is the resistance less than 5 ohms? O7 CHECK CIRCUIT 1205 (BK)
z
Measure the resistance between fog lamp interrupt relay connector Pin
2, Circuit 1205 (BK), and ground.
z Is the resistance less than 5 ohms? Yes
GO to
O8 .
No
REPAIR the
circuit. TEST the
system for
normal
operation. O8 CHECK THE FOG LAMP SWITCH
z
Measure the resistance between fog lamp switch C240 Pin 1, Circuit
188 (WH/BK), connector side and fog lamp switch C240 Pin 2, Circuit
14 (BN), connector side with the fog lamp switch on.
z Is the resistance less then 5 ohms? Yes
REPAIR Circuit
478 (TN/OG).
TEST the system
for normal
operation.
No
INSTALL a new
fog lamp switch.
TEST the system
for normal
operation.
Test Step Result / Action to
Take P1 CHECK THE GROUND TO THE FOG LAMP
z
Key in OFF position.
z Disconnect: Inoperative Fog Lamp.
z Measure the resistance between inoperative fog lamp C162 Pin
1 (RH) or C152 Pin 1 (LH), Circuit 1205 (BK), harness side and
ground. Yes
REPAIR Circuit 478
(TN/OG) for open.
TEST the system for
normal operation. Klj . 4 ba
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Pinpoint Tests
PINPOINT TEST R: THE REVERSING LAMPS ARE INOPERATIVE z
The individual reversing lamp
is inoperative z
Bulb.
z Circuitry. z
GO to Pinpoint Test S .
z The reversing lamps are on
continuously z
Circuitry.
z DTR sensor (A/T).
z Reversing lamp
switch (M/T). z
GO to Pinpoint Test T .
Test Step Result / Action to Take
R1 CHECK THE VOLTAGE TO THE DTR SENSOR (A/T) OR
THE REVERSING LAMP SWITCH (M/T) z
Key in OFF position.
z Disconnect: DTR Sensor C167 (A/T).
z Disconnect: Reversing Lamp Switch C169 (M/T).
z Key in ON position.
z If equipped with A/T, measure the voltage between DTR
sensor C167 Pin 9, Circuit 1087 (OG), harness side and
ground.
z If equipped with M/T, measure the voltage between
reversing lamp switch C169, Circuit 1087 (OG), harness
side and ground.
z Is the voltage greater than 10 volts? Yes
GO to
R2 .
No
REPAIR the circuit. TEST the
system for normal operation. R2 CHECK CIRCUIT 140 (BK/PK) FOR OPEN
z
Key in OFF position.
z If equipped with A/T, measure the resistance between
DTR sensor C167 Pin 11, Circuit 140 (BK/PK), harness
side and ground. Yes
INSTALL a new DTR sensor
(A/T) or reversing lamp switch
(M/T); REFER to
Section 307 -
01 ,
Section 308 - 03A or
Section 308 - 03B . TEST the Klj . 2 ba
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PINPOINT TEST S: THE INDIVIDUAL REVERSING LAMP IS
INOPERATIVE z
If equipped with M/T, measure the resistance between
reversing lamp switch C169, Circuit 140 (BK/PK), harness
side and ground.
z Is the resistance less than 5 ohms? system for normal operation.
No
GO to
R3 .
R3 CHECK REVERSING LAMPS GROUND
z
Disconnect: Inoperative Reversing Lamp.
z Measure the resistance between LH reversing lamp C451,
Circuit 1205 (BK), or RH reversing lamp C461, Circuit
1205 (BK), harness side and ground.
z Is the resistance less than 5 ohms? Yes
REPAIR Circuit 140 (BK/PK)
for open. TEST the system for
normal operation.
No
REPAIR the circuit. TEST the
system for normal operation.
Test Step Result / Action to
Take S1 CHECK REVERSING LAMPS GROUND
z
Key in OFF position.
z Disconnect: Inoperative Reversing Lamp.
z Measure the resistance between LH reversing lamp C451, Circuit
1205 (BK), or RH reversing lamp C461, Circuit 1205 (BK),
harness side and ground. Yes
REPAIR Circuit 140
(BK/PK) for open.
TEST the system for
normal operation. Klj . 3 ba
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PINPOINT TEST T: THE REVERSING LAMPS ARE ON
CONTINUOUSLY z
Is the resistance less than 5 ohms? No
REPAIR the circuit.
TEST the system for
normal operation.
Test Step Result / Action to Take
T1 CHECK THE CONTINUITY OF THE
DTR SENSOR (A/T) OR THE
REVERSING LAMP SWITCH (M/T) z
Key in OFF position.
z Disconnect: DTR Sensor C167
(A/T).
z Disconnect: Reversing Lamp Switch
C169 (M/T).
z Set the parking brake.
z Key in ON position.
z Select REVERSE.
z Are the reversing lamps
illuminated? Yes
REPAIR Circuit 140 (BK/PK) for short to battery.
TEST the system for normal operation.
No
INSTALL a new DTR sensor (A/T) or reversing lamp
switch (M/T); REFER to
Section 307 - 01 ,
Section 308 - 03A , or
Section 308 - 03B . TEST the system for
normal operation. Klj . 4 ba
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