Interior Lighting

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

When the smart junction box (SJB) detects a request for lighting, it turns on the interior lamp by supplying power to the lamp. The request for lighting can be a signal from a door ajar switch, an interior lighting on command from the instrument panel dimmer switch or an unlock command from a remote keyless entry (RKE) transmitter. The door ajar switches are hard-wired directly to the SJB. The door ajar switches are normally open when the doors are closed. All door ajar switches receive voltage from the SJB and each has its own ground circuit. The instrument panel dimmer switch receives voltage from the SJB and has its own ground circuit. The instrument panel dimmer switch provides variable resistance for backlight the instrument cluster and a toggle on/off function for the courtesy lamp.

The inputs are:

Ignition switch position
LH front door ajar switch
RH front door ajar switch
LH rear door ajar switch
RH rear door ajar switch
RKE unlock signal

For additional door ajar switch information, refer to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS .

The output is:

Interior lamp relay