E 450 V8-5.4L (2009)
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For the LH trailer stop/turn lamp, measure the voltage between the trailer tow connector LH stop/turn lamp voltage supply pins, circuit CAT06
(YE), component side and ground.
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For the RH trailer stop/turn lamp, measure the voltage between the trailer tow connector RH stop/turn lamp voltage supply pins, circuit CAT09
(GN), component side and ground.
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For the trailer parking lamps, measure the voltage between the trailer tow connector parking lamp voltage supply pins, circuit CAT17 (BN),
component side and ground.
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Is any voltage present?
Yes
GO to W5.
No
The vehicle is operating correctly. SEND the trailer to an authorized camper/trailer repair facility.
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W5 CHECK THE SUSPECT RELAY
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Ignition ON.
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Disconnect: Suspect Trailer Tow Relay.
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For the LH trailer stop/turn lamp, measure the voltage between the trailer tow connector LH stop/turn lamp voltage supply pins, circuit CAT06
(YE), component side and ground.
-
For the RH trailer stop/turn lamp, measure the voltage between the trailer tow connector RH stop/turn lamp voltage supply pins, circuit CAT09
(GN), component side and ground.
-
For the trailer parking lamps, measure the voltage between the trailer tow connector parking lamp voltage supply pins, circuit CAT17 (BN),
component side and ground.