Interior Lighting

WARNING: This page is about a different car, the 2009 Mercury Sable, 2009 Ford Taurus X, and 2009 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).

The interior lighting system consists of the following components:

Door ajar switches
Instrument panel dimmer switch
Interior/map lamps
Luggage compartment lamp (if equipped)
Luggage compartment/liftgate ajar switches (part of the latch assembly)
Liftgate/trunk module (LTM) (if equipped)
Puddle lamps
SJB
Vanity mirror lamps

The interior lighting system consists of 2 subsystems:

Courtesy lamps
Demand lamps

The courtesy lamps are controlled by the SJB. The courtesy lamp subsystem consists of the ajar switches, interior dome lamps, LTM (if equipped), and the puddle lamps. The SJB supplies voltage to the courtesy lamps when the SJB receives the required input.

The demand lamps are also controlled by the SJB via the battery saver relay. The demand lamps subsystem consists of the instrument panel dimmer switch, luggage compartment lamp (if equipped), all map/reading lamps, and the LH and RH vanity mirror lamps. The SJB energizes the battery saver relay to supply voltage to the demand lamps.

The SJB and the LTM (if equipped) set DTCs if certain circuit failures exist with the interior lighting system.