Aviator AWD V8-4.6L DOHC VIN H (2003)
Test N2-N3
Normal Operation
With the headlamp switch turned to the autolamp position, a battery voltage signal is sent to the vehicle security module through circuit 1399
(DB/WH). The vehicle security module then determines the amount of ambient light based on the input received from the photocell. The input signal
is received through circuit 218 (WH/VT). When the ambient level has reached a point (determined by the internal programming of the vehicle security
module), two internal relays are energized to supply power to the exterior lamps. Circuit 195 (TN/WH) supplies power to the internal parking lamp
relay, which in turn supplies power to circuit 14 (BN) when energized. Circuit 1205 (BK) is the ground circuit for the photocell.
Possible Causes
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Circuit 195 (TN/WH) open.
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Circuit 14 (BN) open.
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Vehicle security module.
Test O
PINPOINT TEST O: ONE OR MORE PARKING, REAR OR LICENSE LAMP IS INOPERATIVE
Test O1-O2
