Normal Operation
WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
With the remote keyless entry (RKE) keypad illumination activated, the vehicle security module supplies voltage to circuit 66 (LB) to illuminate the RKE keypad. The keypad is grounded through circuit 1205 (BK).