Aviator AWD V8-4.6L DOHC VIN H (2003)
Test W1-W4
Normal Operation
Circuit 14 (BN) supplies power to the exterior lamps and the coil side of the trailer tow parking lamp relay. When the trailer tow parking lamp relay is
energized, voltage received from circuit 1043 (DG/YE) is switched to the trailer tow connector through circuit 962 (BN/WH). Circuit 140 (BK/PK)
supplies power to the reversing lamps and the coil side of the trailer tow reversing lamp relay. When the trailer tow reversing lamp relay is energized,
voltage received from circuit 1043 (DG/YE) is switched to the trailer tow connector through circuit 963 (BK/LG). When the LH trailer tow turn relay
is energized, power is routed from circuit 175 (BK/YE) to the trailer tow connector through circuit 52 (YE). When circuit 374 (DB/WH) is supplied
power from the multifunction switch (such as when the brakes are applied or the LH turn signal is engaged), the LH turn relay is energized. When the
RH trailer tow turn relay is energized, power is routed from circuit 175 (BK/YE) to the trailer tow connector through circuit 64 (DG). When circuit
378 (BN/YE) is supplied power from the multifunction switch (such as when the brakes are applied or the RH turn signal is engaged), the RH turn
relay is energized.
Possible Causes
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Circuit 52 (YE) short to power.
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Circuit 64 (DG) short to power.
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Circuit 962 (BN/WH) short to power.
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Circuit 963 (BK/LG) short to power.
Test X
PINPOINT TEST X: THE TRAILER BATTERY CHARGING IS INOPERATIVE
