417-01-1
Exterior Lighting
DIAGNOSIS AND TESTING
Visual Inspection Chart
Headlamps
Refer to Wiring Diagrams Cell 85 for schematic and
Mechanical
Electrical
connector information. Headlamp switch Bussed electrical center
(BEC) fuse 50 (15A)
Special Tool(s)
(high beams) Smart junction box
73III Automotive Meter
(SJB) fuse 67 (30A)
105-R0057 or equivalent Circuitry Bulbs SJB
3.
If an obvious cause for an observed or reported
concern is found, correct the cause (if possible)
Worldwide Diagnostic System
before proceeding to the next step.
(WDS)
NOTE:
Make sure the headlamp switch is in the
Vehicle Communication Module
(VCM) with appropriate
OFF position.
adapters, or equivalent
NOTE:
Make sure the multifunction switch is in
diagnostic tool
the LOW BEAM position.
4.
If the cause is not visually evident, connect the
Flex Probe Kit
diagnostic tool to the data link connector (DLC)
105-R025B or equivalent
and select the vehicle to be tested from the
diagnostic tool menu. If the diagnostic tool does
not communicate with the vehicle: check that the program card is correctly
installed. check the connections to the vehicle.
Principles of Operation check the ignition switch position.
The smart junction box (SJB) monitors the
5.
If the diagnostic tool still does not communicate
headlamp switch position by sending multiple
with the vehicle, refer to the diagnostic tool
voltage reference signals to the headlamp switch.
operating manual.
When the headlamp switch is in any given position,
6.
Carry out the diagnostic tool data link test. If
that input signal is routed to ground.
the diagnostic tool responds with:
The SJB also monitors the multifunction switch for CAN circuit fault; all electronic control units
a flash-to-pass or high beam request. There are 2
no response/not equipped, refer to Section
voltage reference circuits which monitor this. When
418-00.
the multifunction switch is in the FLASH-TO-PASS
or HIGH BEAM position, the voltage signal is No response/not equipped for SJB, refer to
routed to ground.
Section 419-10.
NOTE:
The flash-to-pass feature does not require System passed, retrieve and record the
any input from the headlamp switch.
continuous diagnostic trouble codes (DTCs),
erase the continuous DTCs and carry out the
When the SJB receives an input requesting the
self-test diagnostics for the SJB.
headlamps on, the SJB supplies voltage to the low
beam and high beam bulbs as necessary.
7.
If the DTCs retrieved are related to the concern,
go to the Smart Junction Box (SJB) Diagnostic
Inspection and Verification
Trouble Code (DTC) Index.
1.
Verify the customer concern.
8.
If no DTCs related to the concern are retrieved,
2.
Visually inspect the following for obvious signs
GO to
Symptom Chart
.
of mechanical or electrical damage.
Copyright
©
2004, Ford Motor Company
Last updated: 9/12/2005
2005 Mustang, 12/2004 417-01-2
417-01-2
Exterior Lighting
DIAGNOSIS AND TESTING (Continued)
Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index
DTC
Description
Action
B1342
ECU is Faulted
CLEAR the DTCs. RETRIEVE the DTCs. If
DTC B1342 is retrieved again, INSTALL a new
SJB. REFER to Section 419-10. TEST the
system for normal operation.
B1470
Lamp Headlamp Input Circuit Failure
GO to Pinpoint Test E
.
B2501
LF Lamp Low Beam Circuit Failure
If the low beam is inoperative,
GO to Pinpoint
Test C
.
If the low beam is always on,
GO to Pinpoint
Test E
.
B2503
RF Lamp Low Beam Circuit Failure
If the low beam is inoperative,
GO to Pinpoint
Test C
.
If the low beam is always on,
GO to Pinpoint
Test E
.
B2586
Headlamp Mode Select Circuit Failure
GO to Pinpoint Test E
.
B2598
Headlamp Relay Circuit Failure
If the high beams are inoperative,
GO to
Pinpoint Test B
.
If the high beams are always on,
GO to Pinpoint
Test E
.
All other DTCs REFER to Section 419-10.
Symptom Chart
Symptom Chart
Condition
Possible Sources
Action No communication with the Circuitry REFER to Section 419-10.
smart junction box (SJB) SJB The low beams are Fuse GO to Pinpoint Test A
.
inoperative Circuitry Bussed electrical center
(BEC) SJB The high beams are Fuse GO to Pinpoint Test B
.
inoperative Circuitry High beam relay Multifunction switch BEC SJB One low beam headlamp is Circuitry GO to Pinpoint Test C
.
inoperative BEC SJB One high beam headlamp is Circuitry GO to Pinpoint Test D
.
inoperative BEC The headlamps are on Circuitry GO to Pinpoint Test E
.
continuously High beam relay Headlamp switch Multifunction switch BEC SJB The flash-to-pass feature is Circuitry GO to Pinpoint Test F
.
inoperative Multifunction switch SJB
2005 Mustang, 12/2004 417-01-3
417-01-3
Exterior Lighting
DIAGNOSIS AND TESTING (Continued)
Connector Circuit Reference
Multifunction Switch C202
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
8
1394 (WH/RD) high beam request
Less than 5 ohms between the multifunction
switch and the smart junction box (SJB).
Greater than 10,000 ohms between the
multifunction switch and ground.
9
1395 (RD/PK) flash-to-pass request
Less than 5 ohms between the multifunction
switch and the SJB. Greater than 10,000
ohms between the multifunction switch and
ground.
10
1396 (VT/WH) multifunction switch return
Less than 5 ohms between the multifunction
circuit
switch and the SJB.
Headlamp Switch C205
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
5
1401 (BK/LG) parking lamp request
Less than 5 ohms between the headlamp
switch and the SJB. Greater than 10,000
ohms between the headlamp switch and
ground.
7
1205 (BK) headlamp switch ground
Less than 5 ohms between the headlamp
switch and ground.
2005 Mustang, 12/2004 417-01-4
417-01-4
Exterior Lighting
DIAGNOSIS AND TESTING (Continued)
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
9
1400 (TN/WH) headlamp off request
Less than 5 ohms between the headlamp
switch and the SJB. Greater than 10,000
ohms between the headlamp switch and
ground.
10
1402 (RD/WH) headlamps on request
Less than 5 ohms between the headlamp
switch and the SJB. Greater than 10,000
ohms between the headlamp switch and
ground.
LH Headlamp C1021, RH Headlamp C1041
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
1 (C1021)
1338 (WH) low beam voltage feed
Greater than 10 volts when the headlamp
switch is in the HEADLAMPS ON position.
1 (C1041)
1336 (LG/WH) low beam voltage feed
Greater than 10 volts when the headlamp
switch is in the HEADLAMPS ON position.
2
1205 (BK) headlamp ground circuit
Less than 5 ohms between the headlamp and
ground.
3 (C1021)
1337 (VT/YE) high beam voltage feed circuit
Greater than 10 volts when the headlamp
switch is in the HEADLAMPS ON position
and the multifunction switch is in the HIGH
BEAM position.
3 (C1041)
1335 (YE/WH) high beam voltage feed
Greater than 10 volts when the headlamp
circuit
switch is in the HEADLAMPS ON position
and the multifunction switch is in the HIGH
BEAM position.
Bussed Electrical Center (BEC) C1035a
2005 Mustang, 12/2004 417-01-5
417-01-5
Exterior Lighting
DIAGNOSIS AND TESTING (Continued)
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
A5
1052 (LG/BK) SJB volage supply circuit
Less than 5 ohms between the BEC and the
SJB.
B11
1708 (LG/BK) high beam relay coil control
0 volts, less than 5 ohms between the BEC
circuit
and the SJB.
F2
1336 (LG/WH) RH low beam voltage feed
Greater than 10 volts when the headlamp
switch is in the HEADLAMPS ON position.
Less than 5 ohms between the BEC and the
SJB.
F6
1338 (WH) LH low beam voltage feed
Greater than 10 volts when the headlamp
switch is in the HEADLAMPS ON position.
Less than 5 ohms between the BEC and the
SJB.
BEC C1035c
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
A2
1336 (LG/WH) RH low beam voltage feed
Less than 5 ohms between the BEC and the
headlamp.
A6
1338 (WH) LH low beam voltage feed
Less than 5 ohms between the BEC and the
headlamp.
D5
1205 (BK) LH headlamp ground circuit
Less than 5 ohms between the BEC and the
headlamp.
D11
1205 (BK) RH headlamp ground circuit
Less than 5 ohms between the BEC and the
headlamp.
E11
1205 (BK) RH headlamp ground circuit
Less than 5 ohms between the BEC and
ground.
F5
1205 (BK) LH headlamp ground circuit
Less than 5 ohms between the BEC and
ground.
F6
1337 (VT/YE) LH high beam voltage feed
Less than 5 ohms between the BEC and the
headlamp.
F7
1335 (YE/WH) RH high beam voltage feed
Less than 5 ohms between the BEC and the
headlamp.
2005 Mustang, 12/2004 417-01-6
417-01-6
Exterior Lighting
DIAGNOSIS AND TESTING (Continued)
High Beam Relay C1050
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
85
Battery voltage feed circuit
Greater than 10 volts at all times.
86
1708 (LG/BK) high beam relay coil control
Less than 5 ohms between the high beam
ground circuit
relay and the SJB.
SJB C2280b
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
4
1396 (VT/WH) multifunction switch return
0 volts, less than 5 ohms between the SJB
circuit
and the multifunction switch.
27
1400 (TN/WH) headlamp off request circuit
0 volts, less than 5 ohms between the SJB
and the headlamp switch.
31
1401 (BK/LG) parking lamps on request
0 volts, less than 5 ohms between the SJB
circuit
and the headlamp switch.
40
1395 (RD/PK) flash-to-pass request circuit
0 volts, less than 5 ohms between the SJB
and the multifunction switch.
45
1394 (WH/RD) high beam request circuit
0 volts, less than 5 ohms between the SJB
and the multifunction switch.
46
1402 (RD/WH) headlamps on request circuit
0 volts, less than 5 ohms