RAM 3500 Truck 2WD V10-8.0L VIN W (1997)
Audible Warning Device: Description and Operation
CIRCUIT OPERATION
Buzzer Module
The buzzer module sounds an audible warning tone. The tone sounds for seat belt warning, when the ignition key is in the ignition switch while the
drivers door is OPEN, or the headlamps are left ON with the drivers door open. The tone also sounds when the ignition key is in the ON position
while the drivers side seat belt is not buckled.
Power for the buzzer module is supplied on circuit M1 from fuse 17, a 15 amp, in the fuse block. This fuse is the Ignition-Off Draw fuse (IOD)
and is HOT at all times. Power for the fuse is supplied on circuit A7. This circuit is protected by a 50 amp fuse located in cavity 1 of the Power
Distribution Center (PDC).
When the parking lamps or headlamps are ON, the headlamp switch connects circuit G16 from the drivers side door jamb switch to circuit G26.
Circuit G26 connects to the buzzer module and the key-in switch. Circuit G16 from the drivers side door jamb switch also connects to the key-in
switch.
Circuit G13 from the buzzer module powers the seat belt warning lamp in the instrument cluster. Circuit Z3 at the instrument cluster provides
ground for the lamp.
Circuit G10 from the buzzer module connects to the seat belt switch. When the seat belt switch CLOSES a path to ground is completed on circuit
Z3. Circuit Z3 also grounds the buzzer module.
Message Center
Power for the message center is supplied on circuit F14. This circuit is HOT in the START and RUN position and protected by a 15 amp fuse
located in cavity 12 of the fuse block.
Power for the fuse is supplied on circuit A21 from the ignition switch. Power for the A21 circuit is supplied on circuit A1. This circuit originates
in the Power Distribution Center (PDC) and is protected by a 40 amp fuse located in cavity 3.
The Powertrain Control Module (PCM) controls the ground path for the lamps in the message center.
Circuit G14 is connected from the message center to the PCM and is used for the transmission warning lamp. This circuit connects to cavity C7 of
the PCM on all engine packages.
Circuit G85 is connected from the message center to the PCM and is used for the WAIT-TO-START lamp. The WAIT-TO-START lamp is only
used with the diesel engines. Circuit G85 connects to cavity B20 of the PCM.
Circuit G86 is connected from the message center to the PCM and is used for the WATER IN FUEL lamp. The WATER-IN-FUEL lamp is only
used on vehicles equipped with the diesel engine. Circuit G86 connects to cavity C18 of the PCM.
