ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 9959 > < Initial Inspection and Diagnostic Overview|Page 9957
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Y2-Y3

Normal Operation

Voltage to the RH trailer stoplamp is supplied by the smart junction box (SJB) through circuit CAT09 (GN).

Possible Causes

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Circuit CAT09 (GN) open or short to ground

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Trailer

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SJB

Test Z: The Trailer Lamps Are On Continuously

PINPOINT TEST Z: THE TRAILER LAMPS ARE ON CONTINUOUSLY

Z1

Initial Inspection and Diagnostic Overview|Page 9959 > < Initial Inspection and Diagnostic Overview|Page 9957