Flex AWD V6-3.5L (2009)
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Pinpoint Test AE: The Trailer Electric Brakes Are Inoperative/Do Not Operate Correctly
Trailer Lamps
Pinpoint Tests
Pinpoint Test AE: The Trailer Electric Brakes Are Inoperative/Do Not Operate Correctly
Normal Operation
The Trailer Brake Control (TBC) module is provided voltage at all times by the Battery Junction Box (BJB) fuse 29 (30A) through circuit CAT18
(YE/OG). Ground for the TBC module is provided through circuit RAT08 (WH). The TBC module receives voltage from the stoplamp switch through
circuit CBB08 (VT/WH) when the brake pedal is applied. When a brake application is detected from the stoplamp switch, the TBC module sends
voltage to the trailer tow connector through circuit CAT19 (BU).
This pinpoint test is intended to diagnose the following:
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Fuse
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Wiring, terminals or connectors
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Trailer tow connector
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TBC module
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Trailer
PINPOINT TEST AE: THE TRAILER ELECTRIC BRAKES ARE INOPERATIVE/DO 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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AE1 CHECK THE TBC MODULE FOR A SHORTED OUTPUT
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Ignition ON.
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Measure the voltage between the trailer tow connector electric brake control supply pin, circuit CAT19 (BU), component side and ground.
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Is any voltage present?
Yes
GO to AE2.
No
GO to AE3.
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AE2 CHECK TBC MODULE OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
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Disconnect: TBC Module C2142.
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Measure the voltage between the trailer tow connector electric brake control supply pin, circuit CAT19 (BU), component side and ground.
