Dakota 4WD V6-3.9L VIN X (1997)
Audible Warning Device: Description and Operation
CHIME SYSTEM
The chime system is built into the CTM. The system also supports an external chime request from the instrument cluster. This feature allows the
instrument cluster to request a chime from the CTM for gauge problems and tell-tale warnings. There are two chime rates, Low; 50 chimes per
minute for reminders and High; 180 chimes per minute for serious conditions that require immediate attention. The high rate chime sounds when the
key is left in the ignition and the doors are open or the headlights are left on. The low rate chime sounds for any of the other conditions. There is a
variable rate feature that allows the chime to sound continuously for key-in and headlamp warning as long as the door is open. The seat belt warning
chime is activated for six seconds, and all other chime conditions will activate the chime once at the time the warning light on the cluster is
illuminated.
The chime will sound for the following conditions:
^
Ignition oft, key in ignition, driver's door open
^
Ignition oft, headlamps on, driver's door open
^
Seat belt warning
^
Check engine lamp illuminated (after prove-out)
^
Airbag lamp illuminated (after prove-out)
^
Anti-lock lamp illuminated (after prove-out if equipped)
^
Check gauges lamp illuminated
^
Low fuel
^
Low washer fluid
^
Engine temp critical
^
Engine oil press too low
CIRCUIT OPERATION
Seat Belt Warning Chime
The seat belt chime is used to indicate to the operator that the seat belt is not fastened when the ignition switch is in the RUN position. The seat
belt switch is normally OPEN with the seat belt buckled. Circuit G10 is connected between the Central Timer Module (CTM) and the switch.
Ground for the switch is provided on circuit Z1.
Exterior Lamp-On Warning Chime
The exterior lamp ON chime is used to indicate to the operator that the lamps are ON with the drivers door OPEN and the key removed from the
ignition. The Central Timer Module (CTM) uses information from circuit G26 to determine if the lamps are ON, and circuit G16 for drivers door
ajar.
Key-In Ignition Warning Chime
The Key-In chime is used to indicate to the operator that the key is in the ignition with the driver's door OPEN. If the key is in the ignition, a
ground path is completed from the G26 circuit at the Central Timer Module (CTM), through the CLOSED switch, to the Z1 circuit. The Z1 circuit
is the ground circuit.
When the driver's door is open the normally OPEN door ajar switch CLOSES completing a path to ground on circuit G16. The CTM processes
this information and turns on the chime.
For additional information on the Central Timer Module, refer to Powertrain Management / Computers and Control Systems / Body Control Module.
See: Body and Frame/Body Control Systems/Central Timer Module ( CTM ) High Option/Description and Operation
