Low Oil Pressure Warning Lamp; Low Washer Fluid Warning Lamp; Maintenance Required Indicator Lamp; Seat Belt Reminder Lamp - Dodge ram truck 3500 1996 Service Manual

8E - 1 INSTRUMENT PANEL SYSTEMS
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DESCRIPTION AND OPERATION (Continued)
mately 65 ohms or more from the fuel level sending
unit for 8 to 30 continuous seconds, the indicator
lamp will light. The indicator lamp will remain on
until the circuit senses approximately 65 ohms or
less from the fuel sender for 8 to 30 continuous sec­
onds. See the chart i n Specifications at the back of
this group for more information.
LOW OIL PRESSURE WARNING LAMP
The low oil pressure warning lamp lights with the
ignition switch in the On position and the engine not
running. The lamp should be off when the engine is
running.
Battery voltage is supplied to one side of the indi­
cator bulb when the ignition switch is turned to the
On position. The warning lamp side of the combina­
tion oil pressure switch/sending unit resistor coil is
connected to the other side of the bulb.
When normal engine oil pressure is applied to the
sending unit, resistance on the warning lamp side of
the resistor coil is high and the lamp goes off. When
the engine oil pressure is too low, resistance on the
warning lamp side of the resistor coil is low, which
causes the bulb to light.
LOW WASHER FLUID WARNING LAMP
The low washer fluid warning lamp indicates when
the fluid level in the washer fluid reservoir is too low.
The washer fluid level sensor uses a float in the res­
ervoir to monitor the fluid level. The up and/or down
action of the float opens or closes the switch within
the sensor that provides a ground path to the warn­
ing lamp bulb. Refer to Group 8K - Wiper and
Washer Systems for more information.
MAINTENANCE REQUIRED INDICATOR LAMP
The maintenance required indicator lamp is used
on vehicles equipped with a heavy-duty emissions
cycle package, and a 5.9L V-8, or 8.0L V-10 engine.
This lamp is intended to act as a reminder that
scheduled vehicle emissions services and mainte­
nance must be performed, as required by federal
emissions laws. I t is not intended to indicate a warn­
ing, or that a state of emergency exists. However,
when the lamp has been activated, the required ser­
vices and maintenance must be performed, before the
lamp can be legally reset. For a list of the required
services and maintenance, stated in time or mileage,
refer to Group 0 - Lubrication and Maintenance. Also
refer to Group 25 - Emission Control System for
more information.
MALFUNCTION INDICATOR LAMP
The Check Engine or Malfunction Indicator Lamp
(MIL) lights each time the ignition switch is turned
to the On position, and stays on for three seconds as
a bulb test. I f the Powertrain Control Module (PCM)
receives an incorrect signal or no signal from certain
fuel or emission system related circuits or compo­
nents, the lamp is turned on. This indicates that the
PCM has recorded a Diagnostic Trouble Code (DTC)
in electronic memory for a circuit or component mal­
function. Refer to Group 14 - Fuel System for more
information.
MASTER LIGHTING INDICATOR LMIVIP
The master lighting indicator lamp is only used on
certain export models, where required. The lamp in
the message center is turned on by a signal from the
headlamp switch to indicate that the exterior lamps
are lighted. .
SEAT BELT REMINDER LAMP
The seat belt reminder lamp lights for four to eight
seconds after the ignition switch is turned to the On
position. A timer circuit within the chime/buzzer
module controls ignition-switched battery feed to the
lamp. Refer to Group 8U - Chime/Buzzer Warning
Systems for more information.
TRANSMISSION OIL TEMPERATURE WARNING
LAMP
The transmission oil temperature warning lamp
lights to indicate that the transmission oil is over­
heated. One side of the lamp bulb receives battery
voltage when the ignition switch is turned to the On
position. The other side of the bulb is grounded by
the Powertrain Control Module (PCM), when i t
senses transmission oil temperature is too high. A
sensor located within the transmission sends a signal
to the PCM, indicating the transmission fluid tem­
perature. Refer to Group 21 - Transmission for more
information on the sensor and its circuit. This lamp
is only used on vehicles equipped with a diesel or
V-10 engine option, and an automatic transmission.
TURN SIGNAL INDICATOR LAMPS
The left and right turn signal indicator lamps are
controlled by the turn signal and hazard warning
(multi-function) switches. One side of the bulb for
each lamp is grounded at all times. The other side of
the bulb receives a battery feed through the contacts
of the multi-function switch when the turn signal
lever (multi-function switch stalk) or hazard warning
button is actuated. Refer to Group 8J - Turn Signal
and Hazard Warning Systems for more information.
UPSHIFT INDICATOR LAMP
Vehicles equipped with a manual transmission may
have an optional upshift indicator lamp. One side of
the indicator lamp bulb receives ignition-switched
battery feed. The ground feed for the other side of