Principles of Operation

PRINCIPLES OF OPERATION

Safety Belt Warning Chime
The safety belt warning chime is activated when the ignition switch is in the ON position and the restraints control module (RCM) detects an unbuckled driver or front passenger safety belt. The instrument cluster generates the chime. The duration of the chime is 6 seconds or until the safety belt is buckled.

Safety Belt Minder

NOTE: The safety belt minder feature is configurable. If configuring 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 or front passenger that their safety belt is unbuckled by intermittently sounding a chime and illuminating the safety belt warning indicator 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 feature stops when:
- the driver safety belt is buckled.
- the passenger safety belt is buckled (if the seat is occupied).
- the ignition switch is in the OFF or ACC position.
- 5 minutes have elapsed since the safety belt minder started.

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 ON position for more than 20 seconds. When these conditions exist, the RCM sends a chime request through the air bag warning chime request circuit to the instrument cluster. The instrument cluster activates the air bag warning chime. The warning consists of 5 sets of 5 one second tone bursts. Each set is separated by 5 seconds of silence. The warning is repeated every 30 minutes.

Key-In-Ignition Warning Chime
When the key-in-ignition warning switch closes, it grounds an input to the instrument cluster, which then sounds a warning chime, provided 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 key is rotated to the ON position, or the driver door is closed.

Headlamps On Warning Chime
The headlamps on warning chime is activated when the instrument cluster receives the headlamps 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 headlamps/parking lamps are turned off, the driver door is closed, or 10 minutes have elapsed, at which time the battery saver turns the headlamps off.

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 5 volt reference signal from the instrument cluster. When a switch is pressed, it completes a circuit through a specific resistor in the switch assembly and back to the instrument cluster.

Turn Signal Warning Chime
The turn signal warning chime sounds when the vehicle is driven in excess of 0.8 km (0.5 miles) with the right or left turn signal active continuously. The instrument cluster receives distance traveled information from the anti-lock brake system (ABS) module over the standard corporate protocol (SCP) communication network and receives turn signal activity information from the multifunction switch.