Pinpoint Test I: The Turn Signal Lamps Are Inoperative
Refer to Wiring Diagrams Cell
90
, Turn Signal/Stop/Hazard Lamps for schematic and connector information.
Normal Operation — Except STX
The smart junction box (SJB) provides voltage to the indicator flasher relay through circuit CBP20 (YE/VT). The indicator flasher relay routes the voltage to the multifunction switch through
circuit CLS42 (VT/BN). When the multifunction switch is placed in the LH or RH TURN position, the multifunction switch routes the voltage to the LH or RH front turn lamps through circuits
CLS41 (GY/YE) and CLS39 (VT/WH), respectively. The multifunction switch also routes the voltage to the LH or RH rear lamps through the existing stoplamp circuitry. Ground for the
indicator flasher relay is provided through circuit GD161 (BK/YE).
Normal Operation — STX
The SJB provides voltage to the indicator flasher relay through circuit CBP20 (YE/VT). The indicator flasher relay routes the voltage to the multifunction switch through circuit CLS42
(VT/BN). When the multifunction switch is placed in the LH TURN position, the multifunction switch routes the voltage to the LH front and rear turn lamps through circuits CLS41 (GY/YE).
When the multifunction switch is placed in the RH TURN position, the multifunction switch routes the voltage to the RH front and rear turn lamps through circuits CLS39 (VT/WH). Ground
for the indicator flasher relay is provided through circuit GD161 (BK/YE).
Possible Causes
Fuse
Circuit CBP20 (YE/VT) open
Circuit CLS39 (VT/WH) short to ground
Circuit CLS41 (GY/YE) short to ground
Circuit CLS42 (VT/BN) open, short to ground or voltage
Circuit GD161 (BK/YE) open
Indicator flasher relay
Multifunction switch
SJB
PINPOINT TEST I: THE TURN SIGNAL LAMPS ARE INOPERATIVE
NOTICE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Test Step
Result / Action to Take
I1 CHECK THE TURN SIGNALS
Ignition ON.
Place the multifunction switch in the LH and RH TURN positions.
Do the turn signal lamps illuminate but not flash?
Yes
GO to
I2
.
No
GO to
I4
.
I2 CHECK CIRCUIT CLS42 (VT/BN) FOR A SHORT TO VOLTAGE
Ignition OFF.
Disconnect: Indicator Flasher Relay C2047.
Disconnect: Multifunction Switch C202a.
Ignition ON.
Measure the voltage between the indicator flasher relay C2047-1, circuit CLS42 (VT/BN), harness side and ground.
Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal
operation.
No
GO to
I3
.
I3 CHECK THE MULTIFUNCTION SWITCH FOR A SHORT TO VOLTAGE
Ignition OFF.
Carry out the multifunction switch component test.
Refer to Wiring Diagrams Cell
149
for component testing.
Is the multifunction switch OK?
Yes
INSTALL a new indicator flasher relay. TEST the
system for normal operation.
No
INSTALL a new multifunction switch. REFER to
Section 211-05
. TEST the system for normal
operation.
I4 CHECK FOR A SHORT TO GROUND
Listen to the indicator flasher while placing the multifunction switch in the NEUTRAL, LH and RH TURN positions.
Is there a rapid clicking sound coming from the indicator flasher relay?
Yes
If the sound is continuous regardless of the
multifunction switch position, GO to
I5
.
If the sound is continuous only in the LH or RH
TURN position, GO to
I7
.
No
GO to
I8
.
I5 CHECK THE MULTIFUNCTION SWITCH FOR A SHORT TO GROUND
Ignition OFF.
Disconnect: Multifunction Switch C202a.
Ignition ON.
Is there a rapid clicking sound coming from the indicator flasher relay?
Yes
GO to
I6
.
No
INSTALL a new multifunction switch. REFER to
Section 211-05
. TEST the system for normal
Page 2 of 7
2007 Ranger Workshop Manual
6/20/2011
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS7L/~MUS~LEN/20/S...
