Principles of Operation

PRINCIPLES OF OPERATION

Key-In-Ignition Warning Chime
When the key-in-ignition switch closes, it sends a voltage signal to the instrument cluster, which then sounds a warning chime, provided the ignition key is in the ignition lock cylinder, the ignition switch is in the OFF position, and the driver door is open. The instrument cluster sounds a steady tone, which continues until the key is removed, the ignition switch is rotated to the RUN position, or the driver door is closed.

Air Bag Warning Chime
The air bag warning chime warns the driver that the air bag warning indicator lamp is not working and a fault has occurred by sounding a chime when the ignition switch is in the RUN position for more than 20 seconds. When these conditions exist, the restraints control module (RCM) sends a chime request through the communication network to the instrument cluster. The instrument cluster then activates the warning chime. The warning consists of 5 sets of five 1-second tone bursts. Each set is separated by 5 seconds of silence. The warning is repeated every 30 minutes.

Door/Trunk Ajar Warning Chime
The door/trunk ajar warning chime warns that a door, or the trunk, is not fully closed. The chime sounds when any door or the trunk becomes ajar while the ignition switch is in the RUN position.

Headlamps On Warning Chime
The headlamps on warning chime is activated when the instrument cluster receives the parking lamps ON signal from the smart junction box (SJB), the key is out of the ignition, and the driver door is ajar. The warning consists of repeated one-half second bursts and continues to sound until the exterior lamps are turned off, the driver door is closed, or 10 minutes have elapsed, at which time the battery saver turns the exterior lamps off.

Safety Belt Warning Chime
The safety belt warning chime is activated when the ignition switch is in the RUN position and the RCM detects an unbuckled driver safety belt. The instrument cluster generates the chime for a duration of 6 seconds or until the safety belt is buckled.

Safety Belt Minder

NOTE: The safety belt minder is a configurable item. To configure using a scan tool, refer to Information Bus (Module Communications Network). To configure without using a scan tool, refer to Safety Belt Minder Deactivating/Activating. Service and Repair

The safety belt minder feature supplements the current safety belt warning function. The safety belt minder feature is enabled after the current safety belt warning is complete. The safety belt minder reminds the driver that his/her safety belt is unbuckled by intermittently sounding a chime and illuminating the safety belt warning lamp in the instrument cluster once the vehicle speed has exceeded 5 km/h (3 mph). While activated, the safety belt minder alternates the chime and indicator from ON for 6 seconds, to OFF for 30 seconds.

The safety belt minder reminder stops when:
- the driver or passenger safety belt is buckled.
- the ignition switch is turned to the OFF or ACC position.
- five minutes have elapsed since belt minder has started.

Message Center Warning Chime
The message center warning chime accompanies any initial warning message display, as well as any repeated initial warning message. As the message center is an integral part of the instrument cluster, the interaction between the message center and the chime function is also integral to the instrument cluster.

The message center switch tone sounds when any switch on the message center is pressed. The message center switches are supplied with a voltage reference signal from the instrument cluster. When a switch is pressed, it routes the signal through a specific resistor in the switch assembly and then to ground. Refer to Driver/Vehicle Information Display.

Performance Shift Warning Chime
The performance shift warning chime provides an audible alert to inform the driver to shift the vehicle. The chime is configured through the message center independently of the visual performance shift indicator. The chime feature on/off status and the desired rpm for the chime to sound are configurable items. The instrument cluster uses engine data rpm sent to the instrument cluster over the high speed controller area network (CAN) communication lines and compares the value against the customer preset engine rpm to determine when to sound the chime. When the actual engine rpm matches the preset engine rpm, the instrument cluster sounds the chime.