Mountaineer 2WD V8-4.6L SOHC VIN W (2003)
Vehicle Security Module C3008e
Test O
PINPOINT TEST O: THE EXTERIOR LAMPS ARE INOPERATIVE
Test O1-O2
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. When the headlamp
switch is turned to the headlamp or parklamp position, voltage is supplied directly to circuit 14 (BN). Current then flows directly to all the exterior
lights. Ground is provided to the bulbs through circuit 1205 (BK).
Possible Causes
-
circuit 14 (BN) open
-
circuit 195 (TN/WH) open