F 150 2WD Pickup V8-4.6L VIN W (2006)
A10-A11
Normal Operation
On vehicles equipped with remote keyless entry (RKE), the door ajar switches are hardwired to the vehicle security module. The vehicle security
module monitors the status of all door ajar switches, and when a door is opened, transmits a dome lamp ON signal to the instrument cluster through
UART based protocol (UBP) circuit 1906 (PK), indicating a door has been opened. When the instrument cluster receives the dome lamp ON signal
from the vehicle security module, the instrument cluster energizes the interior lamp circuits, which illuminates the interior lamps and, if equipped, the
puddle lamps in the exterior mirrors.
On vehicles without RKE, the door ajar switches are hardwired to the instrument cluster. When the driver or passenger door is opened, the instrument
cluster receives a ground signal from the driver door ajar switch through circuit 344 (BK/YE), or from the passenger door ajar switch through circuit
345 (BK/PK), and the instrument cluster energizes the interior lamp circuits, causing the interior lamps to illuminate.
The dimmer control switch can be used to turn the interior lamps ON or OFF when the doors are closed. The interior lamp defeat switch can be used
to turn the interior lamps OFF when the doors are open.
Possible Causes
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Fuse
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Circuit 53 (BK/LB) open or short to ground
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Circuit 57 (BK) open
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Circuit 402 (OG/LG) open
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Circuit 1405 (LB/BK) short to ground
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Circuit 3049 (BK/LG) open
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Dimmer control switch
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Instrument cluster
Test B: An Individual Interior Lamp Is Inoperative
PINPOINT TEST B: AN INDIVIDUAL INTERIOR LAMP IS INOPERATIVE
