Courtesy Lamp: Description and Operation

INTERIOR LIGHTING

Principles Of Operation

When the SJB detects a request for lighting it turns on the interior lamps by supplying power or a ground to specific lamps. The request for lighting can be an open door 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 two front door ajar switches and the liftgate ajar switch are normally closed when the doors are closed. The two rear passenger sliding 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 a voltage signal from the SJB. The dimmer switch also has a ground circuit return to the SJB. The instrument panel dimmer switch provides variable resistance for backlighting the instrument cluster and a toggle ON/OFF function for the interior lights.

The RKE receiver is contained inside the SJB. When the SJB receives an unlock request from an RKE transmitter it unlocks the doors, and turns on the interior lamps.

All of the interior lights are supplied voltage through the SJB. The following lamps are illuminated by the SJB switching the voltage circuit:
- LH approach lamp
- RH approach lamp
- LH rear sliding door stepwell
- RH rear sliding door stepwell
- LH footwell
- RH footwell

The following lamps are illuminated by the SJB controlling ground circuits:
- front row dome lamp or overhead console dome lamp (if equipped)
- second row dome lamp
- third row dome lamp
- cargo lamp

The SJB provides the power to the following demand lamps in order to control illumination when in the battery saver mode:
- front row map lamps
- second row map lamps
- third row map lamps
- cargo lamp
- RH vanity mirror lamp
- LH vanity mirror lamp