Courtesy Lamps
Body Control Module (BCM)
The body control module (BCM) controls the interior illumination. Refer
to
Body Control System Circuit Description
Diagnostic Trouble Codes (DTCs)
The BCM may set these DTCs related to the interior courtesy lamps:
Refer to
Body Control Module Diagnostic Information
regarding these DTCs.
Interior Illumination Control
The BCM turns on the courtesy lamps when the following conditions exist:
| • | Any vehicle door is opened. |
| • | The IP dimmer switch is in the dome position. |
| • | During the exit illumination or delayed illumination. |
| • | When unlocking the doors using the keyless entry transmitter. |
The BCM turns OFF the courtesy lamps when all the doors are closed and
the IP dimmer switch is OFF.
All the vehicle doors contain a door lock ajar switch. When the drivers
door is open, the left front door lock ajar switch closes and sends a ground
signal to the BCM through CKT 49. When one of the following doors
is open:
the corresponding door lock ajar switch closes and sends a ground signal
to the BCM through CKT 727. The BCM grounds CKTs 156 and 157
when detecting a ground signal in either CKT 49 or 727.
When the drivers door is closed, the left front door lock ajar switch
opens CKT 49. When one of the following doors is closed:
the corresponding door lock ajar switches open CKT 727. The BCM
then opens CKTs 156 and 157 when either CKT 49 or 727 is open.
The BCM uses the voltage in CKT 240 to power the courtesy lamps
through CKT 1732. The BCM controls the power supplied in CKT 1732
for inadvertent load (battery rundown) protection. The BCM opens CKTs 156
and 157 when the inadvertent load (battery rundown) protection is active,
CKT 1732 is open.
Delayed Illumination
The BCM grounds CKTs 156 and 157 for 22-28 seconds
turning the courtesy lamps ON when the following conditions exist:
| • | The ignition switch is in the LOCK position. |
| • | The IP dimmer switch is OFF. |
| • | The BCM detects a transition from a ground signal to open in either
CKT 49 or 727 when closing all the vehicle doors. |
The detailed illumination feature is canceled when the following conditions
are met:
| • | By turning the ignition switch to the ACC or RUN position. |
| • | By locking the doors when using either a power door lock switch
or a keyless entry transmitter. |
Exit Illumination
The BCM grounds CKTs 156 and 157 for 22-28 seconds
turning on the courtesy lamps when the following conditions are met:
| • | The ignition key is removed from the ignition key cylinder. The
BCM detects a transition from ground to open in CKT 80. |
| • | The IP dimmer switch is OFF. |
| • | All the vehicle doors are closed at the time the ignition key
is removed from the ignition key cylinder. The CKTs 49 and 727 are
open. |
The exit illumination is canceled when the following conditions are
met:
| • | Turning the ignition switch to the ACC or RUN position. |
| • | Locking the doors when using either a power door lock switch or
a keyless entry transmitter. |
| • | Reinserting the key into the ignition cylinder within 5 seconds
when the exit illumination starts. |
Theater Dimming
The BCM dims the courtesy lamps slowly from the full brightness to OFF
in 3 seconds. This feature starts anytime the BCM is turning OFF the
courtesy lamps.
The theater dimming does not work when the following conditions exist:
| • | Turning the IP dimmer switch from the DOME position to OFF position. |
| • | The illumination feature is canceled by locking the doors with
a power door lock switch. |
| • | The exit lighting feature is canceled. |
Keyless Entry Unlock Illumination
The BCM grounds CKTs 156 and 157 for 36-44 seconds
turning on the courtesy lamps when the following conditions are met:
| • | The ignition switch is in the LOCK position. |
| • | All the vehicle doors are closed. |
| • | The IP dimmer switch is OFF. |
| • | The BCM receives a message from the remote control door lock receiver
(RCDLR) to unlock the doors. |
Inadvertent Load (Battery Rundown) Protection
The body control module (BCM) has a feature called the inadvertent load
(battery rundown) protection. The BCM de-energizes CKT 1732 10-22 minutes
after the ignition switch has been turned from the ACC or RUN position to
the LOCK or OFF position.
The BCM restores power to CKT 1732 when the following conditions
are met:
| • | Turning the ignition switch from the LOCK or OFF position to the
ACC or RUN position. |
| • | Removing the key from the ignition lock cylinder. |
| • | Opening any of the vehicle doors. |
| • | Turning the IP dimmer switch to the DOME position. |
| • | The BCM receives a message from the remote control door lock receiver
(RCDLR). |
The inadvertent battery power rundown protection feature is mileage-sensitive.
The vehicles with less than 13-16.5 total driven miles have a 3 minute
time-out instead of 10 minutes.
Roof Rail Courtesy/Reading Lamps
The operation of these lamps is described as part of the courtesy lamps
operation. The BCM provides power (CKT 1732) and ground (CKT 157)
to these lamps controlling their operation.
In addition, these lamps have switches that allow the operator to turn
them ON when the courtesy lamps are OFF. The switches provide ground to these
lamps turning them ON. The switches obtain ground through CKT 850.
Power to these lamps is provided by the BCM through CKT 1732 in order
to be protected by the inadvertent load (battery rundown) protection in case
they are left in the ON position.
Inside Rearview Mirror Reading Lamps
These lamps have switches that allow the operator to turn them ON. The
switches provide ground to these lamps turning them ON. The switches obtain
ground through CKT 850. The BCM does not turn ON these lamps with the
rest of the courtesy lamps. Power to these lamps is provided by the BCM through
CKT 1732 in order to be protected by the inadvertent load (battery
rundown) protection in case they are left in the ON position.
IP Courtesy Lamps and Door Courtesy Lamps
The operation of these lamps is described as part of the courtesy lamps
operation. The BCM provides power (CKT 1732) and ground (CKT 156)
to these lamps controlling their operation.
Dome Lamp
The operation of the dome lamp is described as part of the courtesy
lamps operation. The BCM provides power (CKT 1732) and ground (CKT 157)
to the dome lamp controlling its operation.
IP Dimmer Switch
The IP dimmer switch allows the operator to turn ON the courtesy lamps
from inside the vehicle. When the IP dimmer switch is in the DOME position
the switch sends a voltage signal to the BCM through CKT 1495 causing
the BCM to turn ON the courtesy lamps.
When the IP dimmer switch is OFF the BCM turns OFF the courtesy lamps.
The IP dimmer switch is protected by the inadvertent load (battery rundown)
protection in case the IP dimmer switch is left in the DOME position with
the ignition switch in the LOCK or OFF position.
Sunshade Mirror Lamp
The sunshade mirror lamps turn ON when opening its mirror cover. The
sunshade mirror has a switch that closes, providing ground to the lamps, when
the mirror cover is open and the switch opens when the cover is closed. The
switch receives ground through CKT 850.
Power to the sunshade mirror lamps is provided by the BCM through CKT 1732
in order to be protected by the inadvertent load (battery rundown) protection
in case a mirror cover is left open.
IP Compartment Lamp
The IP compartment lamp turns ON when the IP compartment is open. The
IP compartment lamp has a switch that closes (providing ground to the lamp)
when the IP compartment is open and the switch opens when the IP compartment
is closed. The IP compartment lamp switch receives voltage through CKT 1732
and ground through CKT 1450. The IP compartment is protected by the
inadvertent load (battery rundown) protection in case that the IP compartment
is left open.
Console Compartment Lamp
The console compartment lamp turns ON when the console compartment is
open with the ignition switch in the RUN or ACC position. The console compartment
lamp has a switch that closes, providing voltage to the lamp, when the console
compartment is open. The console compartment lamp receives power through
CKT 635 and ground through CKT 1450. CKT 643 is hot
when the ignition switch is in the ACC or RUN position. The console compartment
lamp does not turn ON when the ignition switch is in the LOCK or OFF position.
Rear Compartment Lamp
The rear compartment courtesy lamp turns ON when the rear compartment
lid is open. The rear compartment lamp has a switch that closes, providing
ground to the lamp (CKT 350), when the rear compartment lid is open. The rear
compartment lamp receives voltage through CKT 1732 and ground through CKT
737. The rear compartment courtesy lamp is protected by the inadvertent
load (battery rundown) protection in case the rear compartment lid is left
in the open position.
