Body Control Module (BCM)
The body control module (BCM) controls the following reminders:
| • | Key In Ignition Reminder:
The key in ignition reminder is an audible warning that is intended to
remind the driver that the key has been left in the ignition cylinder.
The BCM sounds the chime for the reminder at a rate of 135-165 chimes
per minute. |
| • | Fasten Seat Belt Reminder:
The fasten seat belt reminder is an audible warning that is intended
to remind the driver at the beginning of a driving cycle that the driver's
seat belt is unfastened. The BCM sounds the chime for the reminder at
a
rate of 45-55 chimes per minute. |
| • | Fasten Seat Belt Indicator Control:
The fasten seat belt indicator control is a visual warning that
is intended to remind the driver that the driver's seat belt is unfastened. |
| • | Turn Signal Reminder:
The turn
signal reminder is an audible warning that is intended to remind the driver
that the turn signal has been left on when the vehicle has traveled over
1.2 km
(3/4 mile). The BCM sounds the chime for the reminder at a variable
rate, in unison with the turn lamps ON, of 50 chimes per minute. |
| • | Driver Information Display Reminder:
The driver information display reminder is an audible warning that is
intended to attract the driver's attention to the driver information display
(DID) when a vehicle door is opened. The BCM sounds the chime 4 times
at a rate of 120 chimes per minute. |
| • | Trip Calculator Reminder:
The trip
calculator reminder is an audible warning that is intended to attract the
driver's attention to the trip calculator upon the occurrence of a trip
calculator warning message. The BCM sounds the chime for the reminder at
a rate of 1 chime per trip calculator message. |
| • | Headlamps ON Reminder:
The headlamps
ON reminder is an audible warning that is intended to remind the driver that
the headlamps have been left ON. The BCM sounds the chime for the reminder
at a rate of 180-220 chimes per minute. |
| • | Last Door Closed Locking Confirmation:
The last door closed locking confirmation is an audible warning that is
intended to provide the driver feedback that the last door closed locking
feature is active. |
| • | Feature Customization and Diagnostics Feedback:
The feature customization and diagnostics feedback is an audible
feedback that is used when the feature customization modes are changed. The
feedback is used by service technicians during BCM diagnostics, as well.
The BCM sounds the chime and the fasten belts indicator ON and OFF during
feature customization and diagnostics. Refer to
Body Control Module Diagnostic Information
in Body Control System. |
Key In Ignition Reminder
The BCM sounds the key in ignition reminder when the following conditions
exist:
| • | The driver's door is open (ground signal in circuit 159) |
| • | The key is fully inserted in the ignition cylinder (ground signal
in circuit 80) |
| • | The ignition switch is in the OFF position or the UNLOCK position |
Fasten Seat Belt Reminder
The BCM sounds the fasten seat belt reminder ON warning for 5.4-6.6 seconds
when the following conditions exist:
| • | The ignition switch is turned from the OFF position to the RUN
position |
| • | The driver's seat belt is unfastened (ground signal in circuit 238) |
If the driver's seat belt is fastened and unfastened within the 6 second
chime period, the BCM stops the chime while the driver's seat is fastened.
The BCM resumes the chime for the 6 second period if the driver's
seat belt is unfastened.
Fasten Belts Indicator Control
The BCM turns ON the fasten belts indicator for 63-77 seconds
when the following conditions exist:
- The ignition switch is in the RUN position
- The driver's seat belt is unfastened (ground signal in circuit 238)
If the driver's seat belt is fastened during the 70 second period,
the BCM turns OFF the fasten belts indicator. The BCM turns ON he fasten belts
indicator for 63-77 seconds (repeating the sequence) if the
driver's seat belt is unfastened during the same ignition cycle.
Turn Signal Reminder
The BCM sounds the turn signal reminder 1 time per each flash
of the turn signal lights when the following conditions exist:
| • | The ignition switch is in the RUN position |
| • | The turn signal switch is in either the left turn position or
the right turn position. The BCM senses, within 1 second, an open to
the B+ transition in either circuit 14 or circuit 15. |
| • | The vehicle has traveled a distance of 1.2 km (3/4 mile).
The BCM counts the pulses on the vehicle speed input circuit 389. |
The BCM keeps the turn signal reminder active until one of the following
conditions exist:
- The ignition switch is turned to the UNLOCK position or the OFF
position
- The turn signal switch returns to the OFF position. The BCM senses,
within 1 second, an open to the B+ transition in either circuit 14
or circuit 15.
Driver Information Display Reminder
The BCM sounds the driver information display (DID) reminder when a
ground signal from the DID in circuit 653 is received. The chime sounds
4 times at a rate of 120 chimes per minute.
Trip Calculator Reminder
The BCM sounds the trip calculator reminder when a ground signal from
the trip calculator in circuit 653 is received. The chime sounds 1 time
per trip calculator warning message.
Headlamps ON Reminder
The BCM sounds the headlamps ON reminder when the following conditions
exist:
| • | The driver's door is open (ground signal in circuit 159) |
| • | The headlamp switch is in either the PARK position or the HEAD
position (an open in circuit 80). |
Last Door Closed Locking Confirmation
Refer to
Automatic Door Lock Circuit Description
in Doors for additional information regarding
the last door closed locking feature.
BCM Inputs and Outputs
| • | Key In Ignition Switch Input:
The BCM interfaces with the ignition key alarm switch. The
ignition key alarm switch grounds circuit 80 when the key is fully
inserted in the ignition switch. The switch opens when the key is removed
from the ignition switch. The BCM uses the input or the operation of
the key in ignition reminder. The ignition key alarm switch receives
ground through circuit 1550. |
| • | Driver's Door Ajar Switch Input:
The BCM uses the input for the operation of the key in ignition
reminder and the headlamps ON reminder. The door lock switch grounds
circuit 159 when the driver's door is open. |
| • | Driver Seat Belt Switch Input:
The BCM determines when the driver's seat belt is fastened
through the seat belt switch. The seat belt switch opens when the driver's
seat belt is fastened. The seat belt switch closes when the driver's
seat belt is unfastened, causing the switch to ground circuit 238.
The BCM uses the input for the operation of the fasten belts lamp indicator
and the chime reminder. |
| • | Left/Right Turn Signal Input:
The BCM determines that the turn signal switch is ON when it
senses a transition from an open to B+ in either circuit 14 (left)
or circuit 15 (right). The BCM determines that the turn signal
is OFF when it senses a constant open or B+ in either circuit 14
(left) or circuit 15 (right). The BCM uses the input for the operation
of the turn signal reminder. |
| • | Vehicle Speed Input:
The BCM determines the vehicle traveled distance when it interfaces
with the vehicle speed circuit 389. The circuit grounds 4000 times
per 1.6 km
(1 mile) traveled. The BCM uses the input for the operation of the
turn signal reminder. |
| • | Auxiliary Chime Input:
The driver
information display (DID) interfaces with the BCM in order to chime when
a vehicle door is open. The DID grounds the auxiliary chime input (circuit 653)
for the period of time that the door remains open. The BCM sounds the chime
4 times when circuit 653 is grounded for more than 450 ms. |
| | The trip calculator interfaces with the BCM in order to sound the chime
when the trip calculator displays a warning message. The trip calculator grounds
the auxiliary chime input (circuit 653) for less than 450 ms,
causing the BCM to sound the chime 1 time. |
| • | Park Lights OFF Input:
The BCM senses
a voltage signal through the park lights OFF input (circuit 1872)
when the headlamp switch is in the OFF position. The circuit opens when the
headlamp switch is in the PARK position or the HEAD position. The BCM uses
the input for the operation of the headlamps ON reminder. |
| • | Fasten Belt Indicator Control Output:
The BCM uses the fasten belt indicator control output for the operation
of the fasten belts indicator. The BCM applies voltage to circuit 529.
The application of voltage turns ON the fasten belt indicator. The fasten
belts indicator is always grounded through circuit 1450. |
