2012 RAM CHASSIS CAB bulb

28. Seat Belt Reminder Light
When the ignition switch is first turned to ON/
RUN, this light will turn on for four to eight
seconds as a bulb check. During the bulb check, if
the driver’s seat belt is unbuckled, a chime will sound.
After the bulb check or when driving, if the driver’s seat
belt remains unbuckled, the seat belt reminder light will
flash or remain on continuously. Refer to “Occupant
Restraints” in “Things To Know Before Starting Your
Vehicle” for further information.
29. Charging System Light
This light shows the status of the electrical charg-
ing system. The light should come on when the
ignition switch is first turned to ON/RUN and remain on briefly as a bulb check. If the light stays on or comes on
while driving, turn off some of the vehicle’s non-essential
electrical devices or increase engine speed (if at idle). If
the charging system light remains on, it means that the
vehicle is experiencing a problem with the charging
system. Obtain SERVICE IMMEDIATELY. See an autho-
rized dealer.
If jump starting is required, refer to “Jump Starting
Procedures” in “What To Do In Emergencies”.
For vehicles equipped with a premium cluster this indi-
cator will display in the Electronic Vehicle Information
Center (EVIC). Refer to ”Electronic Vehicle Information
Center (EVIC) — If Equipped” for further information.202 UNDERSTANDING YOUR INSTRUMENT PANEL

• Charging System Light
This light shows the status of the electrical charg-
ing system. The light should come on when the
ignition switch is first turned ON and remain on briefly
as a bulb check. If the light stays on or comes on while
driving, turn off some of the vehicle’s non-essential
electrical devices or increase engine speed (if at idle). If
the charging system light remains on, it means that the
vehicle is experiencing a problem with the charging
system. Obtain SERVICE IMMEDIATELY. See an autho-
rized dealer.
• Electronic Speed Control Light
This light will turn on when the electronic
speed control is ON. • Electronic Throttle Control (ETC) Light
This light informs you of a problem with the
Electronic Throttle Control (ETC) system. The
light will come on when the ignition is first
turned ON and remain on briefly as a bulb
check. If the light does not come on during starting, have
the system checked by an authorized dealer.
If a problem is detected, the light will come on while the
engine is running. Cycle the ignition key when the
vehicle has completely stopped and the shift lever is
placed in the PARK position. The light should turn off.
If the light remains lit with the engine running, your
vehicle will usually be drivable. However, see an autho-
rized dealer for service as soon as possible. If the light is
flashing when the engine is running, immediate service is
required. You may experience reduced performance, an
elevated/rough idle or engine stall and your vehicle may
require towing.208 UNDERSTANDING YOUR INSTRUMENT PANEL

▫ Exhaust System ..................... 414
▫ Cooling System ..................... 417
▫ Brake System ....................... 423
▫ Rear Axle And 4X4 Front Driving Axle Fluid
Level ............................. 425
▫ Transfer Case ....................... 427
▫ Automatic Transmission ............... 427
▫ Appearance Care And Protection From
Corrosion .......................... 430
 Fuses .............................. 435
▫ Totally Integrated Power Module ......... 435
 Vehicle Storage ....................... 441  Replacement Bulbs .................... 442
 Bulb Replacement ..................... 443
▫ Dual Or Quad Headlamp/Front Park And
Turn Signal – If Equipped .............. 443
▫ Fog Lamps – If Equipped .............. 445
▫ Center High-Mounted Stoplamp (CHMSL)
With Cargo Lamp .................... 445
▫ Cab Top Clearance Lamps – If Equipped .... 447
 Fluid Capacities ...................... 449
 Fluids, Lubricants And Genuine Parts ....... 450
▫ Engine ............................ 450
▫ Chassis ........................... 451400 MAINTAINING YOUR VEHICLE

the SELECT button to turn off the message. If the
problem continues, the message will appear the next time
the vehicle is started.
A loose, improperly installed, or damaged fuel filler cap
may also turn on the Malfunction Indicator Light (MIL).
EMISSIONS INSPECTION AND MAINTENANCE
PROGRAMS
In some localities, it may be a legal requirement to pass
an inspection of your vehicle’s emissions control system.
Failure to pass could prevent vehicle registration.
For states that require an Inspection and Mainte-
nance (I/M), this check verifies the “Malfunction
Indicator Light (MIL)” is functioning and is not
on when the engine is running, and that the OBD II
system is ready for testing. Normally, the OBD II system will be ready. The OBD II
system may not be ready if your vehicle was recently
serviced, recently had a dead battery or a battery replace-
ment. If the OBD II system should be determined not
ready for the I/M test, your vehicle may fail the test.
Your vehicle has a simple ignition key-actuated test,
which you can use prior to going to the test station. To
check if your vehicle’s OBD II system is ready, you must
do the following:
1. Turn the ignition switch to the ON position, but do not
crank or start the engine.
2. If you crank or start the engine, you will have to start
this test over.
3. As soon as you turn the ignition switch to the ON
position, you will see the MIL symbol come on as part of
a normal bulb check.
7 MAINTAINING YOUR VEHICLE 403

(or check to see if the fuse is blown) to ensure that it is
fully seated. When the IOD fuse is extracted, the
instrument cluster in the odometer window will dis-
play  NO FUSE.”
REPLACEMENT BULBS
LIGHT BULBS – Interior Bulb No.
Overhead Console Lamps ............... TS 212-2
Dome Lamp ........................... 7679
NOTE: For lighted switches, see your authorized dealer
for replacement instructions.
All of the inside bulbs are brass or glass-wedge base.
Aluminum base bulbs are not approved. LIGHT BULBS – Exterior Bulb No.
Center High Mounted Stop Lamp (CHMSL) ..... 921
Fog Lamp ............................. 9145
Dual Headlamp ......................... H13
Quad Headlamp – Low Beam ............... H11
Quad Headlamp – High Beam .............. 9005
Front Turn Signal Lamp (Dual Headlamp) ..... 3157K
Front Turn Signal Lamp (Quad Headlamp) . . . 3157NA
Rear Cargo Lamp ........................ 921
Cab Roof Marker Lamps ................. 194NA442 MAINTAINING YOUR VEHICLE

BULB REPLACEMENT
Dual Or Quad Headlamp/Front Park And Turn
Signal – If Equipped
1. Open the hood.
2. Disconnect and isolate the negative battery cable.
3. Remove the four plastic push-in fasteners that secure
the upper radiator seal to the grille support and both
fender ledges.
4. Remove the two plastic push-in rivets that secure the
upper radiator seal to the radiator.
5. Remove the upper radiator seal from the vehicle.
6. Remove the two headlamp assembly attachment
screws. 7. Reach into the front wheel house ahead of the front
wheel, remove the fastener, and lift the cover over the
access hole in the front of the wheel house splash shield.
Access to the rear of the lamp can be gained through this
access hole.
7 MAINTAINING YOUR VEHICLE 443

8. Reach through the access hole of the wheel house
splash shield and lift the slide lock upward far enough to
disengage it from the lock post on the back of the front
lamp unit housing.
9. Remove the headlamp assembly. Grasp the outboard
edge of the lamp and pull it straight forward to disen-
gage the ball stud from the plastic grommet. 10. Disconnect electrical connectors.
11. Replace bulb(s) as necessary.
CAUTION!• Do not contaminate the bulb glass by touching it
with your fingers or by allowing it to contact other
oily surfaces. Shortened bulb life will result.
• Always use the correct bulb size and type for
replacement. An incorrect bulb size or type may
overheat and cause damage to the lamp, the bulb
socket, or the lamp wiring.
NOTE: There are access covers over both headlamp
bulb access holes in the quad front lamp unit housing (if
equipped). These covers MUST be reinstalled after the
bulb has been replaced.444 MAINTAINING YOUR VEHICLE

Fog Lamps – If Equipped
1. Reach under and behind the front bumper to access
the back of the front fog lamp housing.
2. Disconnect the fog lamp wiring harness connector
from the fog lamp bulb.
3. Rotate the bulb counterclockwise 1
4
turn to unlock the
bulb from the housing.
4. Pull the bulb straight out from the housing.
CAUTION!Do not contaminate the bulb glass by touching it
with your fingers or by allowing it to contact other
oily surfaces. Shortened bulb life will result. Center High-Mounted Stoplamp (CHMSL) With
Cargo Lamp
1. Remove the two screws holding the housing/lens to
the body as shown.
7 MAINTAINING YOUR VEHICLE 445