Chrysler RAM TRUCK 2500 1994 Service Manual page 524

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BUZZER WARNING SYSTEMS 8U - 1
BUZZER WARNING SYSTEMS
C O N T E N T S
page page
BUZZER MODULE REPLACEMENT 5 KEY-IN SWITCH REPLACEMENT 4
DIAGNOSIS 1 OPERATION 1
GENERAL INFORMATION 1
GENERAL INFORMATION
The buzzer module is located i n the left end of the
instrument panel (Fig. 1) behind the fuseblock mod­
ule cover. The buzzer sounds an audible warning
tone i n any of the following conditions:
• Vehicle lights are ON when the driver's door is
opened.
• The key is in the ignition and the driver's door is
open.
• The ignition is switched ON and the driver's seat
belt is not buckled. Buzzer will quit after 4 to 8 sec­
onds. I n addition to the buzzer, a seat belt indicator
lamp turns on for 4-8 seconds as a reminder to fasten
seat belt.
BUZZER
MODULE
Fig. 1 Buzzer Module Location
OPERATION
Battery voltage for module operation is supplied to
two pins. Battery voltage is present at pin 7 at all
times (Figs. 2 and 3). Pin 1 receives voltage when the
ignition switch is turned ON.
S E A T BELT WARNING
To sound the seat belt warning, the module needs:
• battery voltage at the ignition switch input (pin 1).
• a ground at the seat belt switch.
• a ground at pin 3 to activate the timer.
This occurs when the seat belt switch is closed be­
cause the driver's seat belt is not buckled. The Fas­
ten Belt lamp will also turn on, along with the
warning sound.
KEY4N4GNITION
To sound the key-in-ignition alarm, the module
needs:
• the ignition key warning switch must be closed.
• the driver's door jamb switch must be closed.
These conditions ground pin 6 of the module. These
switches are closed when the driver's door is open
and the key is i n the ignition.
L I G H T S ON
To sound the lights-on warning, the module needs:
• the headlamp switch must be closed.
• the driver's door jamb switch must be closed.
These conditions ground pin 6 of the module. These
switches are closed when the driver's door is open
and the headlamp switch is ON.
DIAGNOSIS
I f the buzzer unit does not operate as described,
check the two fuses for pins 1 and 7 (Figs. 2, 3 and 4)
and replace as required. I f the fuses are not defec­
tive, perform the following tests to determine i f the
problem is i n the module or in the wiring. Remove
buzzer module, refer to Buzzer Module Replacement.
Plug i n a known good module and check its opera­
tion. I f the problem is not corrected by replacing the
module, remove the module and continue as follows:
VOLTAGE T E S T S
Ignition i n ON, measure between the follow­
ing pins and vehicle ground.
• Measure voltage at buzzer module connector pin 1.
Meter should read battery voltage. I f not, repair open
to ignition switch.
Turn ignition O F F and remove key from igni­
tion.
• Measure voltage at buzzer module connector pin 7.
Meter should read battery voltage. I f not, repair open
to fuse. Battery voltage is present at pin 7 at all
times, regardless of ignition switch position.