Principles of Operation

PRINCIPLES OF OPERATION

NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).

The instrument cluster (IC) uses different chimes to alert the driver of various vehicle conditions as follows:
- Safety belt warning (repetitive chime)
- Belt-Minder(R) warning (repetitive chime after a delay and after the safety belt chime is completed)
- Key-in-ignition warning (repetitive chime)
- Headlamps on warning (repetitive chime)
- Turn signal on warning (single tone chime after 3.2 km [2 miles])
- Turn signal tone (tic-tock chime)
- Parking brake warning (repetitive chime)
- Air bag secondary warning chime (repetitive chime)
- Message center general tone (single tone)

Safety Belt Warning Chime
The safety belt warning chime warns that the safety belt is not fastened. The safety belt warning chime sounds when the driver or passenger safety belt is not fastened and the ignition key is turned from the OFF/LOCK or ACC to the ON or START position.

The safety belt warning chime stops sounding when the safety belt is fastened, when the ignition key is turned from the ON or START position to the OFF/LOCK or ACC position, or when the chime has sounded for approximately 6 seconds.

The safety belt warning chime inputs are:
- Ignition switch position
- Driver or passenger safety belt switch data communicated by the restraints control module (RCM) to the instrument cluster (IC) through the controller area network (CAN)

Belt-Minder(R)
The Belt-Minder(R) is configurable. To configure using a scan tool, refer to Information Bus (Module Configuration). To configure without using a scan tool, refer to Belt-Minder(R) Deactivating/Activating.

The Belt-Minder(R) feature supplements the current safety belt warning function. The Belt-Minder(R) is enabled after the current safety belt warning is complete. The Belt-Minder(R) reminds the driver that the driver or passenger safety belt is unbuckled by intermittently sounding a chime and illuminating the safety belt warning lamp in the instrument cluster (IC) once the vehicle speed has exceeded 5 km/h (3 mph). While activated, the Belt-Minder(R) alternates the chime and indicator from on for 6 seconds to off for 60 seconds.

NOTE: The Belt-Minder(R) is disabled for 1 ignition switch ON cycle if the safety belt is buckled then unbuckled during that specific cycle.

Key-In-Ignition Warning Chime
The key-in-ignition warning chime warns that the key is still in the ignition lock cylinder when the driver door is ajar. The key-in-ignition warning chime sounds when the driver door is ajar, the key is in the ignition lock cylinder and in the OFF/LOCK or ACC position.

The key-in-ignition warning chime stops sounding when the driver door is closed, the key is removed from the ignition lock cylinder, or if the ignition key is turned to the ON position.

The key-in-ignition warning chime inputs are:
- Ignition switch position
- Door ajar data communicated by the smart junction box (SJB) to the instrument cluster (IC) through the CAN
- Key-in-ignition switch signal from the ignition switch

Headlamps On Warning Chime
The headlamps on warning chime warns that the headlamps are on when the driver door is ajar and the key is removed from the ignition lock cylinder. The headlamps on warning chime sounds if the driver door is ajar, the headlamp switch is in the headlamp or parking lamp on position, and the ignition switch in the OFF/LOCK position.

The headlamps on warning chime stops sounding when any one of the above conditions are removed.

The headlamps on warning chime inputs are:
- Ignition switch position
- Driver door ajar data communicated by the SJB to the instrument cluster (IC) through the CAN
- Headlamp switch data communicated by the SJB to the instrument cluster (IC) through the CAN

Turn Signal On Warning Chime
The turn signal on warning chime warns that the turn signal has not been cancelled. The turn signal on warning chime sounds if the left or right turn signal is on and the vehicle has traveled more than 3.2 km (2 miles).

The turn signal on warning chime stops sounding if the turn signal is turned off, or if the ignition key is turned to the OFF or ACC position.

The turn signal on warning chime inputs are:
- Turn signal data communicated by the SJB to the instrument cluster (IC) through the CAN communication
- Odometer count data communicated by the PCM to the instrument cluster (IC) through the CAN

Parking Brake Warning Chime
The parking brake warning chime warns that the parking brake is engaged when the vehicle is in motion. The parking brake warning chime sounds if the ignition key is in ON position, the parking brake is engaged, and the vehicle speed is greater than 5 km/h (3 mph).

The parking brake warning chime stops sounding if the parking brake is released, the ignition key is not in the ON position, or if the vehicle speed is less than 5 km/h (3 mph).

The parking brake warning chime inputs are:
- Ignition switch position
- Parking brake switch data communicated by the SJB to the instrument cluster (IC) through the CAN
- Vehicle speed data communicated by the PCM to the instrument cluster (IC) through the CAN

Air Bag Secondary Warning Chime
The air bag secondary warning chime warns that the air bag warning indicator light does not work correctly. The instrument cluster (IC) monitors the air bag warning indicator status internally. When a fault is present in the air bag warning indicator and the instrument cluster (IC) receives an air bag warning indicator on request from the RCM, the air bag secondary warning chime sounds.

The air bag secondary warning chime input is:
- Air bag warning indicator request data communicated by the RCM to the instrument cluster (IC)

Turn/Hazard On Tone
The turn/hazard on tone provides an audible tic-toc in addition to the turn/hazard indicator lamps. The turn/hazard on tone sounds if the turn or hazard signals are on.

The turn/hazard on tone inputs are:
- Left turn indicator signal from the SJB to the instrument cluster (IC)
- Right turn indicator signal from the SJB to the instrument cluster (IC)

Message Center Warning Chime
The message center warning chime sounds when a new warning message is displayed on the message center. If multiple warning messages are present, a chime tone sounds for each of the warnings that are displayed. The message center warning chime inputs are the warning messages displayed on the message center. The message center warning chime sounds to alert the driver when a concern is detected in one of the following systems:
- Tire pressure monitoring system (TPMS)
- Door ajar
- Low fuel level