Principles of Operation
The instrument cluster controls the following chimes:
- driver or passenger safety belt not fastened warning chime (warning times out)
- key-in-ignition warning (repetitive chime)
- headlamp-on warning (repetitive chime)
- door ajar warning (repetitive chime)
- safety belt warning chime (repetitive chime)
- belt minder warning chime (repetitive chime after a delay and the safety belt chime has completed)
- fail safe cooling chime
- turn lamp left on chime
- airbag warning chime
- electronic parking brake 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 switch is turned from the OFF/LOCK or ACC position to the RUN or START position.
The safety belt warning chime stops sounding when the safety belt is fastened, when the ignition switch is switched from the RUN 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 in the START position
- ignition switch in the RUN position
- driver or passenger safety belt switch data communicated by the restraint control module (RCM) to the instrument cluster on circuit 8-GE52 (WH/BK)
The safety belt warning lamp along with the chime warns that the safety belt is not fastened. The safety belt warning lamp illuminates when the safety belt is not fastened and the ignition switch is turned from the OFF/LOCK or ACC position to the RUN or START position.
The safety belt warning lamp turns off when the safety belt is fastened, the ignition switch is moved from the RUN or START position to the OFF/LOCK or ACC position, or if the lamp is illuminated for approximately 6 seconds.
The safety belt warning lamp inputs are:
- ignition switch in the START position
- ignition switch in the RUN position
- driver or passenger safety belt switch data communicated by the restraint control module (RCM) to the instrument cluster on circuit 8-GE52 (WH/BK)
The belt minder feature supplements the current safety belt warning function. The belt minder is enabled after the current safety belt warning is complete. The belt minder 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. While activated, the belt minder alternates the chime and indicator from on for 6 seconds to off for 30 seconds.
The door ajar warning chime warns that a door is not fully closed. The chime sounds when any door or the luggage compartment lid becomes ajar while the ignition switch is in the RUN position.
The door ajar warning indicator warns that a door is not fully closed. The door ajar warning indicator illuminates when any door or the luggage compartment lid initially becomes ajar while the ignition switch is in the RUN position.
The door ajar warning indicator turns off when all doors and the luggage compartment lid are closed, or the ignition switch is turned to the OFF/LOCK or ACC position.
The door ajar warning lamp/chime inputs are:
- ignition switch in the START position
- ignition switch in the RUN position
- door ajar data communicated by the front electronic module (FEM) and the rear electronic module (REM) to the instrument cluster on the communication network
The key-in-ignition warning chime sounds when the driver door is ajar and the key is in the ignition switch.
The key-in-ignition warning chime stops sounding when the driver door is closed or the key is removed from the ignition switch.
The key-in-ignition warning chime input is the key-in-ignition switch circuit 30S-GM7 (RD/WH), voltage applied with the key in the ignition switch.
The headlamp on warning chime warns that the headlamps are on when the driver door is ajar and the key is removed from the ignition switch. The headlamps on warning chime sounds if the driver door is ajar, the headlamp switch is in the PARK or HEAD position, and the ignition switch is in the OFF/LOCK position with the key out.
The headlamp on warning chime will stop sounding when any one of the above conditions are removed.
The headlamp on warning chime inputs are:
- ignition switch in the START position
- ignition switch in the RUN position
- key-in-ignition switch circuit 30S-GM7 (RD/WH), no voltage applied with the key removed from the ignition switch
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 restraint control module (RCM) sends a chime request through communication network to the instrument cluster. The instrument cluster then activates the warning chime.
The electronic parking brake warning chime reminds the driver that the parking brake is engaged by intermittently sounding a chime and illuminating the brake warning indicator in the instrument cluster once the vehicle speed has exceeded 4 km/h (3 mph).
The turn signal warning chime sounds when the vehicle is driven in excess of 0.8 km (0.5 mile) with the right or left turn signal active continuously.
The fail-safe cooling mode has 2 levels of operation, which are transmitted from the powertrain control module (PCM) over the communication network to the instrument cluster. When the engine coolant temperature reaches an over-temperature condition, the PCM provides a level 1 over-temperature signal to the instrument cluster. The instrument cluster positions the temperature gauge in the HOT range, illuminates the over-temperature warning indicator, oil pressure warning indicator, and malfunction indicator lamp (MIL). The instrument cluster also provides an intermittent chime, consisting of 3 tones within a 2-second interval. If the over-temperature continues to increase, the PCM provides the instrument cluster with a level 2 over-temperature signal and the intermittent chime strategy sounds 5 tones within a 2-second interval.