The body control module (BCM) produces four audible warnings
to alert the driver of a system concern or a critical vehicle condition. If
multiple audible warnings requests are received at the same time, the warning
with the highest priority will sound first. The following lists the
audible warning priority and pulse rate:
- Fast rate chime (150 pulses per min)
- Medium rate chime (100 pulses per min)
- Slow rate chime (50 pulses per min)
- Turn Signal reminder (will pulse @ turn signal flasher rate)
Fasten Safety Belt Warning
The body control module (BCM) senses that the driver's seat belt is
not buckled (signal is low). The BCM sends a class 2 message to the
IPC requesting illumination of the seat belt indicator. The BCM seat belt
chime sounds at the rate of 50 pulses per minute (slow rate chime) for
a duration of approximately 6 seconds. The fasten safety belt warning
sounds and the seat belt indicator illuminates when the following occurs:
• | Ignition switch transitions to ON. |
• | The seat belt switch signal to the BCM is low. |
If the seat belt is buckled when the ignition is turned on, the chime
will not sound. If the seat belt is buckled while the chime is sounding, the
chime stops.
Key-In-Ignition Warning
When the BCM detects the key is in the ignition (signal is low) and
the driver's door is open, it activates an audible warning. The key-in-ignition
chime sounds at the rate of 100 pulses per minute (medium rate chime) until
the driver door is closed or the key removed from the ignition switch.
The BCM activates the key-in-ignition warning when all of the following
occurs:
• | The ignition switch is OFF. |
• | The key-in-ignition switch signal is low. |
• | The driver door jamb switch signal is low (driver door open). |
Lights On Chime
The BCM will activate an audible warning as a reminder that the headlamps
are left on when exiting the vehicle with the ignition switch in the off
position. The lights on warning sounds at the rate of 150 pulses per minute
(fast rate chime) until the headlamp switch in turned off. The BCM receives
a signal from the headlamp and panel dimmer switch via the headlamp relay.
The BCM activates the lights on warning chime when the following occurs:
• | The park lamp switch input is active. |
• | The dimming potentiometer input is not in a maximum dimming state. |
Turn Signal Warning
The BCM activates an audible warning as a reminder that the turn signal
has been on for a distance of more than 1.20 km (0.75 mi).
The BCM receives the vehicle speed and distance via the vehicle speed signal
circuit. The turn signal chime will use a tone that is synchronized with
the turn signal flasher. The BCM will activate the turn signal chime
when the following occurs:
• | Left or right turn signal switch is ON. |
• | The vehicle has traveled further than 1.20 km (0.75 mi). |
Park Brake Chime
The BCM activates the park brake chime when the park brake is engaged
(signal circuit is low) and vehicle is driven for at least 3 seconds
at a speed above 3 mph. The chime will sound at the rate of 150 pulses
per minute (fast rate chime). The park brake indicator will flash for any
distance the vehicle is driven every half second until the park brake is
no longer engaged.