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Overhead Console Lamp and Roof Rail Courtesy/Reading Lamps
The courtesy/reading lamp is a duel purpose lamp that can be illuminated two different ways. First, the lamp can be turned ON during courtesy lamp operation as described above. Second, the lamps can be turned ON individually for reading lamp operation by the lamp switch. The BCM supplies battery voltage from the INT LAMPS fuse through the inadvertent power courtesy lamps circuit to the courtesy/reading lamps for reading lamp operation only. Ground for the courtesy lamp module or the roof/rail reading lamps is provided at G402
Courtesy Lamps
When either one of the front doors is opened, ground is applied through the door latch door open switch and the door open switch signal circuit to the door module indicting the door open position. In response to this signal, the door module sends a GMLAN serial data message to the BCM of the door open position. Or, when either one of the rear doors is opened, ground is applied through the door latch door open switch and the rear door open switch signal circuit to the BCM is indicating the rear door open position. Once a door open message or signal received, the BCM will then apply battery voltage from the CTSY/RF TRN fuse through the courtesy lamp supply voltage circuits illuminating the lamps listed below:
• Overhead console lamp
• Roof rail courtesy lamps
• Footwell courtesy lamps
The BCM receives battery voltage from the INT LAMPS fuse in order to supply power to the inadvertent courtesy lamps. Inadvertent power courtesy lamp feature provides a similar function for the interior lamps as a retained accessory power feature. The BCM will energize the courtesy lamps supply voltage circuit when the BCM is in the active state (awake). When the inadvertent power courtesy lamps supply voltage circuit is energized, it supplies voltage to all the interior lights listed below. The BCM will continue to supply voltage to the interior lamps after the ignition is turned OFF so that the interior lamps may be operated.
• Overhead Console Reading Lamps
• Roof Rail Reading Lamps
• Vanity Mirror Lamps
• I/P Compartment Lamp
• Rear Compartment Courtesy Lamp
In the event that any of these lamps were to remain illuminated for a period of more than 20 minutes with the ignition switch in the OFF position and no BCM input activity, the BCM will deactivate the inadvertent power supply voltage circuit to prevent a total battery discharge condition.
The BCM receives battery voltage from the CTSY/RF TRN fuse in order to supply power to the courtesy lamps. The BCM applies this voltage to the courtesy lamps through the courtesy lamp supply voltage circuits. When any door is opened, the door open switch contacts close and the BCM receives a door-open signal. If the BCM receives a door lock or unlock signal, the BCM will activate the courtesy lamp supply voltage circuit, providing battery voltage to the dome lamps and the left and right footwell courtesy lamps. The courtesy lamps can be manually activated by placing the interior lamp switch in the DOME position. For more detailed information concerning courtesy lamp operation refer to Interior Lighting Systems Description and Operation.
Rear fuse box. INT LP 10 amp . there is also INT LP relay in the same rear fuse box .
Fuse Block - Rear
Under the rear seat, on the left side of the floor pan
The INT LP fuse in the fuse block - rear supplies battery positive voltage to the normally open switch contacts of the INT LP relay. The INT LP fuse also supplies battery positive voltage to the INT LP relay control circuit. The fuse block - rear also supplies battery positive voltage to the relay control circuit for the front courtesy lamp. The door modules communicate on a simple bus interface (SBI). When you open any door, the switch contacts of the door open switch close. When a door open signal circuit is grounded, that door module sends a message to the drivers door module (DDM) in order to indicate that a door is open. The DDM sends a class 2 message to the rear integration module (RIM) in order to indicate which door is open. The RIM activates the INT LP relay in order to provide battery positive voltage to the interior courtesy lamps. When any front door is opened, the RIM will energize the FRT CTSY lamp relay grounding the I/Pcourtsey lamps at G302. Depending on which doors are opened, front or rear, the proper interior courtesy lamps illuminate. The RIM provides a pulse width modulated ground to all interior courtesy lamps for the interior lights theater dimming feature. Some of the courtesy lamps are also used as reading lamps, each reading lamp may be manually turned on or off using it's own respective switch
The first thing that comes to mind is that the dash lights scroll dimmer is scrolled all the way in one direction which manually shuts off all the interior lights, even if a door is opened. At night turn on the parking lamps and then scroll the dash lights dimmer until the dash, radio face, overhead console, etc is brighter. Turn off the headlamp switch. Shut off the engine and exit the vehicle. Interior lights on? Hope this helps.
Page 116 and 117 of the manual explain that there's a two-position slide switch on the map light, DOOR and OFF. The back light has three positions, ON, Door Activated, and OFF.
The bulbs is replaced from the back of the overhead console with 1/4 turn bulb holders.
the overhead console ( non rail version ) is held up with spring clips.
Open the rear compartment, and grab the rear corners and pull down 1 at a time. They are very hard to pull the 1st few times. Once you have the read released, there is another set of spring clips in the front, so be careful how far down you pull the rear, until the front is released.
Once you can see the back of the overhead console, you will see the 1/4 turn bulb holders for the map and interior lights.
Open one door at a time and press the door button-switch (in the door-frame, hinge side usually) to see if that switch will shut off the light. If you find one that does, either extend the button length slightly with hot glue or epoxy, or replace the switch. Make sure the light has not been turned on at the light or that the switch is bad.
Is the overhead interior light switch turned off with the effect that when the doors are opened the interior light doesn't come on. Alter the switch setting and open the door: if the interior light comes on then you should see the warning light come on if the vehicle lights are left on. Failing that it's likely to be a faulty doorswitch or the cable and connector to the doorswitch has become detached. Try unscrewing the doorswitch and withdrawing it from the vehicle body and check that the wire is still connected. Check using a multimeter that the switch operates electrically when open and closed. Replace or repair as appropriate.
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