Flex AWD V6-3.5L (2009)
Trailer Lamps
Pinpoint Tests
Pinpoint Test AD: The Trailer Battery Charging Is Inoperative/Does Not Operate Correctly
Normal Operation
The trailer battery charge relay coil receives voltage from the Smart Junction Box (SJB) fuse 33 (10A) through circuit CBP33 (WH/BN) when the
ignition switch is in the RUN position. Ground for the trailer battery charge relay coil is supplied through circuit GD120 (BK/GN). The Battery Junction
Box (BJB) fuse 30 (40A) supplies voltage to the trailer battery charge relay switch side. When the trailer battery charge relay is energized, the voltage is
routed to the trailer tow connector through circuit CAT14 (OG).
This pinpoint test is intended to diagnose the following:
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Fuse
-
Wiring, terminals or connectors
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Trailer tow connector
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Trailer battery charge relay
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Trailer
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SJB
PINPOINT TEST AD: THE TRAILER BATTERY CHARGING IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Before beginning diagnostics, visually inspect the trailer tow connector mounted on the bumper for signs of corrosion or damage. Repair or
install a new trailer tow connector as required.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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AD1 CHECK FOR VOLTAGE THROUGH THE TRAILER TOW CONNECTOR
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Ignition ON.
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Measure the voltage between the trailer tow connector battery charge voltage supply pin, circuit CAT14 (OG), component side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AD8.
No
GO to AD2.
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AD2 CHECK FOR VOLTAGE AT THE TRAILER TOW CONNECTOR (INOPERATIVE)
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Ignition OFF.
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Disconnect: Trailer Tow C4099.
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Ignition ON.
-
Measure the voltage between the trailer tow C4099-5, circuit CAT14 (OG), harness side and ground.
