The BCM performs the BCM functions in the wake-up state. The BCM enters the sleep state when the active control or monitoring of system malfunctions has stopped, or when the BCM is idling. The BCM must detect certain wake-up inputs before entering the wake-up state. The BCM monitors the BCM inputs during the sleep state, allowing the BCM to switch between the two states. The BCM wake-ups are as follows:

The BCM is asleep when the BCM has stopped controlling or monitoring devices and has become idle again. After the ignition switch is turned to the LOCK position and 20 minutes (1216 seconds) elapse without any Wake-Up signals, the BCM enters into an asleep state and goes into the low power mode. If the BCM is in low power mode and detects a wake up, the BCM will enter into the wake-up state and enter the high power mode. If the vehicle has been left inactive (ignition in the LOCK position and no BCM wake-ups) for 20 minutes, the BCM will return to the low power mode.

The ambient light level sensor has two states, LIGHT and DARK. If the headlamp switch is set to AUTO while in the LIGHT state, the radio, the PRNDL, and the passenger air bag switch will stay fully bright. If the headlamp switch is set to the PARK LAMP or the HEADLAMP position while in the LIGHT state, the radio, the PRNDL, and the passenger air bag switch will dim with dimming control. If the headlamp switch is set to the AUTO, the PARK LAMP, or the HEADLAMP position while in the DARK state, the radio, the PRNDL, and the four wheel drive switch will dim with the dimming control.

If the headlamp switch is set to the AUTO position while in the LIGHT state, the daytime running lights (DRL) are ON. If the park brake is then set, the DRLs will turn OFF. When the park brake is RELEASED the DRLs will turn back ON. If the headlamp switch is set to the PARK LAMP position while in the LIGHT state, the DRLs will be ON and the park lamps will be ON. If the Headlamp switch is set to the HEADLAMP position while in the LIGHT state, the DRLs will be OFF, the park lamps will be ON and the headlamps will be ON. If the headlamp switch is set to the AUTO position while in the LIGHT state the and the ambient light level conditions change to DARK for 15 seconds, then the BCM will turn the Headlamps ON. When the ambient light sensor is in the DARK state the daytime running lights (DRLs) will be OFF regardless of the headlamp switch position. When the ambient light sensor changes state from DARK to LIGHT the headlamps will turn OFF and the DRL will turn ON after a 20 second delay.

The front fog lamps are a controlled by the BCM. If the park lamps are ON, the high beams are OFF and the fog lamp switch is pressed, the BCM will command the fog lamp relay ON. When the BCM senses a momentary low signal on the fog lamp switch circuit, the fog lamps will turn OFF. Toggle the HIGH/LOW beam switch and the front fog lamps will toggle ON/OFF.

The Passlock™ theft deterrent system is designed to prevent vehicle operation if the correct ignition key is not used to start the vehicle. The ignition key will allow the lock cylinder to turn, which allows the Passlock™ sensor (located inside of the ignition switch assembly) to send a code to the BCM. If the BCM receives the correct code from the Passlock™ sensor the BCM will send a password to the vehicle control module (VCM) or the powertrain control module (PCM) which will allow the vehicle to start.

The battery run down protection will protect the battery against being run down, from the courtesy lamp circuit, to the level which will not allow the vehicle to start. The BCM will turn OFF the courtesy lamp circuit after the ignition switch is turned to the OFF position, and 40 minutes (2400 seconds) have elapsed and without a lamp request Input.

The RAP feature allows the power windows and the radio to be operated after the ignition switch is turned from the RUN position to the LOCK position. This feature is operable only if the battery voltage is above the minimum voltage threshold when the ignition switch is turned to the OFF position. The power windows and the radio will be turned OFF when any door is OPENED or after 20 minutes have elapsed since the last ignition cycle.

Interior lights will illuminate for 15 seconds under any of the conditions listed below:

Interior lights will illuminate continuously if the interior light defeat switch is OFF and any door is OPENED, or if the dimmer switch is ROTATED to the ON position for interior illumination.

Interior lights will ILLUMINATE for 40 seconds when the ignition key is REMOVED from the ignition cylinder.

The BCM is responsible for energizing the drivers door unlock relay. The drivers door unlock relay will be energized whenever the BCM receives a command from any of the door LOCK/UNLOCK switches.

The lockout prevention feature is to prevent locking the vehicle with the keys in the ignition switch. This feature is activated when the key is in the ignition switch, any door is OPENED and then the power lock switch is PRESSED. This feature will LOCK the doors then UNLOCK the drivers door.

When the BCM determines a driver warning sound is needed, the BCM will sound the chime when applicable.

The chime will sound when the ignition switch is not in the RUN or CRANK position, the ignition key is in the ignition key cylinder, and the drivers door is OPENED.

The chime will sound when the headlamp switch is in the PARK LAMP or HEADLAMP position and the ignition switch is in the OFF position or ACC position.

The chime will sound for 8 seconds when the ignition switch is turned from the OFF position to the RUN position and the seat belt is UNFASTENED. The seat belt indicator on the IPC will also turn ON.

The chime will sound when the right or left turn signal is turned ON for more than 0.75 miles. The chime will be synchronous with the turn signal flasher.

The BCM sends requests to the instrument panel cluster (IPC) to turn the IPC indicators ON or OFF. These requests are sent on the Class 2 serial data line. If the IPC can not communicate with the BCM via Class 2 the IPC will turn the Security telltale ON steady. The list of messages sent by the BCM to the IPC are as follows:

The BCM can turn ON some of the exterior lighting independently of the exterior lighting system. The BCM can command ON the following exterior lights:

The BCM can turn ON some of the interior lighting independently of the interior lighting system. The BCM can command ON the following interior lights: