Turn Signal and Hazard Lamps
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Principles of Operation
NOTE:
The smart junction box (SJB) is also known as the generic electronic module (GEM).
Turn Signal Lamps
Voltage is supplied by the SJB to the indicator flasher relay when the ignition switch is in the RUN position. When the multifunction switch is placed in the LH or RH TURN position, voltage
is routed to the multifunction switch, which then routes the voltage to the turn lamps. The electronic flasher relay then cycles the voltage on and off approximately 80 times per minute. If a
front or rear turn bulb is inoperative, the electronic flasher relay cycles the voltage on and off approximately 160 times per minute.
Hazard Lamps
Voltage is supplied by the SJB to the indicator flasher relay at all times. When the hazard switch is engaged, voltage is routed to the multifunction switch, which then routes the voltage to all
the turn lamps.
Inspection and Verification
1. Verify the customer concern.
2. Visually inspect the following for obvious signs of mechanical or electrical damage.
Visual Inspection Chart
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the concern is not visually evident, verify the symptom. GO to
Symptom Chart
.
Symptom Chart
Pinpoint Tests
SECTION 417-01: Exterior Lighting
2007 Ranger Workshop Manual
DIAGNOSIS AND TESTING
Procedure revision date: 09/21/2007
Special Tool(s)
73III Automotive Meter
105-R0057 or equivalent
Flex Probe Kit
105-R025C or equivalent
Mechanical
Electrical
Multifunction switch
Smart junction box (SJB) fuse(s):
17 (15A) (hazard lamps)
20 (10A) (turn lamps)
Indicator flasher relay
Circuitry
SJB
Symptom Chart
Condition
Possible Sources
Action
The turn signal lamps are inoperative
Fuse
Circuitry
Indicator flasher relay
Multifunction switch
Smart junction box
(SJB)
GO to Pinpoint Test I
.
The turn signal lamps are always on
Multifunction switch
INSTALL a new multifunction switch. REFER to
Section 211-05
. TEST the
system for normal operation.
One turn signal/hazard lamp is
inoperative/always on
Circuitry
Multifunction switch
GO to Pinpoint Test J
.
The hazard lamps are inoperative
Fuse
Circuitry
Indicator flasher relay
Multifunction switch
SJB
GO to Pinpoint Test K
.
The hazard lamps are always on
Multifunction switch
INSTALL a new multifunction switch. REFER to
Section 211-05
. TEST the
system for normal operation.
Page 1 of 7
2007 Ranger Workshop Manual
6/20/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS7L/~MUS~LEN/20/S...
