wiring FORD MUSTANG 2003 User Guide

DIAGNOSIS AND TESTING
Steering Column Switches
Refer to Wiring Diagrams Cell
13 , Power Distribution for schematic and connector information.
Refer to Wiring Diagrams Cell 81 , Interval Wiper/Washer for schematic and connector information.
Refer to Wiring Diagrams Cell 85 , Headlamps for schematic and connector information.
Refer to Wiring Diagrams Cell 90 , Turn/Stop/Hazard Lamps for schematic and connector information.
Inspection and Verification 1. Verify the customer concern by operating the multifunction or ignition switch.
2. Visually inspect for obvious signs of mechanical and electrical damage.
3. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan
tool menu. If the scan tool does not communicate with the vehicle:
zcheck that the program card is correctly installed.
SECTION 211-
05: Steering Column Switches 2003 Mustang Workshop Manual Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-
F224,
New Generation STAR (NGS)
Tester
418- F052, or equivalent scan
tool 73 Digital Multimeter
105-
R0051 or equivalent
Visual Inspection Chart Mechanical Electrical
z
Ignition key
z Ignition switch
z Multifunction switch
z Turn signal switch
z Hazard/flasher switch z
Battery junction box (BJB) Fuses:
„(3) IGN (40A)
z Central junction box (CJB) Fuses:
„6 (25A)
„ 39 (5A)
z Damaged wiring harness
z Loose or corroded connections Klj . 1 ba
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Symptom Chart
Pinpoint Tests
PINPOINT TEST A: NO COMMUNICATION WITH THE GENERIC
ELECTRONIC MODULE Circuit Failure
B2488 RF Side Repeater Lamp Output
Circuit Failure GEM REFER to
Section 417 - 01 .
C1189 Brake Fluid Level Sensor Input
Short Circuit to Ground GEM REFER to
Section 413 - 01 .
C1223 Lamp Brake Warning Output
Circuit Failure GEM REFER to
Section 413 - 01 .
C1225 Lamp Brake Warning Output
Circuit Short to Battery GEM REFER to
Section 413 - 01 .
Symptom Chart Condition
Possible Sources Action
z No communication with
the generic electronic
module z
CJB Fuse 39
(5A).
z Circuitry.
z GEM. z
Go To Pinpoint Test A .
z The ignition switch is
inoperative z
BJB Fuse IGN
SW (40A).
z Ignition switch.
z Circuitry. z
Go To Pinpoint Test B .
z No power in ACC zIgnition switch.
z Circuitry. z
Go To Pinpoint Test C .
z No power in RUN zIgnition switch.
z Circuitry. z
Go To Pinpoint Test D .
z No power in START zIgnition switch.
z Circuitry. z
Go To Pinpoint Test E .
z The multifunction
switch/hazard switch
does not operate
correctly z
Multifunction
switch. z
Carry out the multifunction
switch component test.
REFER to Wiring Diagrams,
Cell 149, Component
Testing. Test Step Result / Action to Take
CAUTION: Use the correct probe adapter(s) when making measurements. Filaure to
use the correct probe adapter(s) may damage the connector. A1 CHECK THE GENERIC ELECTRONIC MODULE (GEM)
POWER SUPPLY z
Key in OFF position.
z Disconnect: Generic Electronic Module (GEM) C201a. Yes
GO to
A2 . Klj . 4 ba
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PINPOINT TEST B: THE IGNITION SWITCH IS INOPERATIVE z
Disconnect: GEM C201b.
z Key in ON position.
z Using the following table. measure the voltage between the
GEM, harness side and ground.
z Are the voltages greater than 10 volts? Connector Pin Circuit
C201a 2 400 (LB/BK)
C201a 3 1006 (DG/WH)
C201b 1 1001 (WH/YE)
C201b 4 193 (YE/LG) No
REPAIR the circuit(s) in
question. TEST the system
for normal operation.
A2 CHECK THE GEM GROUND CIRCUIT 397 (BK/WH) FOR
OPEN z
Key in OFF position.
z Measure the resistance between the GEM C201b pin 2,
circuit 397 (BK/WH), harness side and ground.
z Is the resistance less than 5 ohms? Yes
GO to
A3 .
No
REPAIR the circuit(s) in
question. TEST the system
for normal operation. A3 CHECK CIRCUIT 397 (BK/WH) FOR SHORT TO POWER
z
Measure the voltage between GEM C201b pin 2, circuit 397
(BK/WH), harness side and ground.
z Is any voltage present? Yes
REPAIR the circuit. TEST
the system for normal
operation.
No
REFER to
Section 418 - 00 .
Test Step Result / Action to Take
B1 CHECK THE IGNITION SWITCH
z
Carry out the ignition switch component test.
REFER to Wiring Diagrams Cell 149,
Component Testing.
z Is the ignition switch OK ? Yes
INSTALL a new BJB. TEST the system for
normal operation. Klj . 5 ba
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PINPOINT TEST C: NO POWER IN ACC
PINPOINT TEST D: NO POWER IN RUN
PINPOINT TEST E: NO POWER IN START No
INSTALL a new ignition switch. REFER to
Ignition Switch
. TEST the system for
normal operation. Test Step Result / Action to Take
C1 CHECK THE RADIO FOR NORMAL OPERATION
z
Key in ON position.
z Check the radio for normal operation.
z Does the radio operate correctly? Yes
GO to
C2 .
No
Go To Pinpoint Test D .
C2 CHECK THE VOLTAGE AT THE IGNITION SWITCH
z
Disconnect: Ignition Switch C250 .
z Measure the voltage between ignition switch C250 Pin B5,
Circuit 1050 (LG/VT), harness side and ground.
z Is the voltage greater than 10 volts? Yes
INSTALL a new ignition
switch. REFER to
Ignition Switch . TEST the system for
normal operation.
No
REPAIR the circuit. TEST the
system for normal operation. Test Step Result / Action to Take
D1 CHECK THE IGNITION SWITCH
z
Carry out the ignition switch component test.
REFER to Wiring Diagrams Cell 149,
Component Testing.
z Is the ignition switch OK ? Yes
INSTALL a new BJB. TEST the system for
normal operation.
No
INSTALL a new ignition switch. REFER to
Ignition Switch
. TEST the system for
normal operation. Test Step Result / Action to Take
E1 CHECK THE VOLTAGE TO THE IGNITION SWITCH
z
Key in OFF position.
z Disconnect: Ignition Switch C250 . Yes
GO to
E2 . Klj . 6 ba
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Component Test
Ignition Switch Continuity Check
Refer to Wiring Diagrams Cell 149, Component Testing.
Multifunction Switch
Refer to Wiring Diagrams Cell 149, Component Testing. z
Measure the voltage between ignition switch C250 Pin B4,
Circuit 1050 (LG/VT), harness side and ground; and between
ignition switch C250 Pin B5, Circuit 1050 (LG/VT), harness side
and ground.
z Are the voltages greater than 10 volts? No
REPAIR the circuit in
question.TEST system
for normal operation.
E2 CHECK THE CONTINUITY OF THE IGNITION SWITCH
z
Carry out the ignition switch continuity test. REFER to Wiring
Diagrams, Cell 149, Component Testing.
z Does the ignition switch test OK? Yes
GO to
E3 .
No
INSTALL a new ignition
switch. REFER to
Ignition Switch . TEST
the system for normal
operation. E3 CHECK CIRCUIT 16 (RD/LB), AND CIRCUIT 33 (WH/PK)
z
Connect: Ignition Switch C250.
z Turn ignition switch to START.
z Does the starter engage? Yes
REPAIR Circuit 16
(RD/LB). TEST the
system for normal
operation.
No
REPAIR Circuit 33
(WH/PK). TEST the
system for normal
operation. Klj . 7 ba
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12. Disconnect the crankshaft position sensor electrical connector.
13. Remove the wiring harness pin-
type retainer.
14. Remove the oil filter.
15. Remove the retainers and the water pump. Klj . 3 ba
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6.
NOTE: The number 12 bolt is not part of the tightening sequence.
Tighten the fasteners to 26 Nm (19 lb- ft) in the sequence shown.
7. Install a new oil filter.
8. Install the wiring harness pin- type retainer. Klj . 6 ba
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15. Remove the starter motor. For additional information, refer to
Section 303 - 06 .
16. Position the wiring harness bracket aside.
17. Remove the transmission lower bolts.
18. Remove the oil pan bolts.
19. Position a safety stand under the subframe crossmember. Klj . 4 ba
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22. Disconnect the engine oil pressure sender electrical connector.
23. Remove the pin-
type retainer.
24. Disconnect the crankshaft position (CKP) sensor electrical connector.
25. Remove the engine wiring harness.
26. Remove the stud bolt. Klj . 7 ba
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23. Position the wiring harness.
24. Connect the following connectors:
z42- pin electrical connector
z 16-pin electrical connector
z 8-pin electrical connector
z A/C pressure switch
25. Connect the heater hoses. Klj . 6 ba
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