Grand Prix V6-3.1L VIN J (2000)
Interior Lighting Module: Description and Operation
Interior Lights Circuit Description
Body Control Module (BCM)
The Body Control Module (BCM) controls the interior illumination. One of 3 BCM types is installed on this vehicle based on the vehicle equipment.
The BCM type 2 provides the following features:
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The interior Illumination control
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The inadvertent load (battery rundown) protection
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The chime functions
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The Retained Accessory Power (RAP)
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The automatic power door locks
The BCM type 3 provides the BCM type 2 features plus the keyless entry system (RPO AUO).
The BCM type 4 provides the BCM type 2 and 3 features plus the content theft deterrent (RPO UA6) with remote activation verification and remote
alarm.
Refer to RPO List See: Application and ID
Interior Illumination Control
The BCM turns on the courtesy lights when the following actions occur:
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Any of the vehicle doors are opened.
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The IP dimmer switch is in the DOME position.
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When the exit illumination feature is active
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When unlocking the doors using the keyless entry transmitter (BCM types 3 and 4 only).
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When unlocking a door using a door cylinder lock (BCM type 4 only).
The BCM turns OFF the courtesy lights when all of 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 circuit 159.
When 1 of the right front, left rear or right rear doors is open, the corresponding door lock ajar switch closes and sends a ground signal to the BCM
through circuit 49. The BCM grounds circuit 690 when detecting a ground signal in either circuit 49 or circuit 159.
When the drivers door is closed, the left right door lock ajar switch opens circuit 159. When the right front, left rear and right rear doors are closed, the
corresponding door lock ajar switches open circuit 49. The BCM then opens circuit 690 when both circuit 49 and circuit 159 are open.
The BCM uses the voltage in circuit 240 to power the courtesy lights through circuit 1393. The BCM controls the power supplied in circuit 1393 for
inadvertent load (battery rundown) protection. The BCM opens circuit 690 when the inadvertent load (battery rundown) protection is active (circuit 1393
is open).
Delayed Illumination
The BCM grounds circuit 690 for 22-28 seconds turning on the courtesy lights when the following conditions are met:
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The delay illumination is enabled (interior lighting mode 2 or 4). Refer to Interior Lighting Modes.
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The ignition switch is in the OFF position.
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The IP dimmer is OFF.
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When closing all of the vehicle doors. The BCM will detect a transition from a ground signal to an open circuit in either circuit 49 or circuit 159.
The delayed illumination feature is canceled when turning the ignition switch to the ACC or RUN position or by unlocking the doors when using either a
power door lock switch or a keyless entry transmitter.
Exit Illumination
The BCM grounds circuit 690 for 22-28 seconds turning on the courtesy lights when the following conditions are met:
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The exit illumination is enabled (interior lighting mode-3 or 4). Refer to Interior Lighting Modes.
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The ignition key is removed from the ignition key cylinder. The BCM detects a transition from ground to an open in circuit 80.
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The IP dimmer switch is OFF.
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All of the vehicle doors are closed at the time the ignition key is removed from the ignition key cylinder. Circuits 49 and 159 are open.
The exit illumination is canceled when the following conditions are met:
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Turning the ignition switch to the ACC or RUN position.
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Locking the doors when using either a power door lock switch or a keyless entry transmitter.
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Re-inserting the key into the ignition cylinder within 5 seconds when the exit illumination starts.
Theater Dimming
The BCM dims the courtesy lights slowly from full brightness to off in 3 seconds. This feature starts anytime the BCM is turning off the courtesy lights.
The theater dimming does not work when turning the IP dimmer switch from the DOME position to the OFF position or when the illumination feature is
canceled by locking the doors with a power door lock switch. Also, the theatre dimming does not work when the exit lighting feature is canceled.
