brake Ram 2500 2018 Service Manual

CAUTION!
duced or complete loss of trailer braking.
There may be a increase in stopping dis-
tance or trailer instability which could re-
sult in damage to your vehicle, trailer, or
other property.
WARNING!
Connecting a trailer that is not compatible
with the ITBM system may result in re-
duced or complete loss of trailer braking.
There may be a increase in stopping dis-
tance or trailer instability which could re-
sult in personal injury.NOTE:
• An aftermarket controller may be available
for use with trailers with air or electric-over-
hydraulic trailer brake systems. To deter-
mine the type of brakes on your trailer and
the availability of controllers, check with
your trailer manufacturer or dealer.
• Removal of the ITBM will cause errors and it may cause damage to the electrical sys-
tem and electronic modules of the vehicle.
See your authorized dealer if an aftermar-
ket module is to be installed.
195

Recreational Towing —
Two-Wheel Drive Models
DO NOT flat tow this vehicle. Damage to the
drivetrain will result.
Recreational towing (for two-wheel drive
models) is allowedONLYif the rear wheels are
OFF the ground. This may be accomplished
using a tow dolly or vehicle trailer. If using a
tow dolly, follow this procedure:
NOTE:
If vehicle is equipped with air suspension,
ensure the vehicle is set to Normal Ride
Height.
1. Properly secure the dolly to the tow ve- hicle, following the dolly manufacturer's
instructions.
2. Drive the rear wheels onto the tow dolly. 3. Firmly apply the parking brake. Place au-
tomatic transmission in PARK, manual
transmission in gear (not in NEUTRAL).
4. Properly secure the rear wheels to the dolly, following the dolly manufacturer's
instructions.
5. Turn the ignition OFF and remove the key fob.
6. Install a suitable clamping device, de- signed for towing, to secure the front
wheels in the straight position.
CAUTION!
• Towing with the rear wheels on theground will cause severe transmission
damage. Damage from improper towing
is not covered under the New Vehicle
Limited Warranty.
• Do not disconnect the driveshaft be-
cause fluid may leak from the transmis-
sion, causing damage to internal parts.
Recreational Towing —
Four-Wheel Drive Models
NOTE:
Both the manual shift and electronic shift
transfer cases must be shifted into NEUTRAL
(N) for recreational towing. Automatic trans-
missions must be shifted into PARK for rec-
reational towing. Manual transmissions must
be placed in gear (NOT in NEUTRAL) for
recreational towing. Refer to the following for
the proper transfer case NEUTRAL (N) shift-
ing procedure for your vehicle.
CAUTION!
• DO NOT dolly tow any 4WD vehicle.Towing with only one set of wheels on the
ground (front or rear) will cause severe
transmission and/or transfer case dam-
age. Tow with all four wheels either ON
the ground, or OFF the ground (using a
vehicle trailer).
• Tow only in the forward direction. Towing
this vehicle backwards can cause severe
damage to the transfer case.
197

CAUTION!
• Before recreational towing, the transfercase must be in NEUTRAL. To be certain
the transfer case is fully in NEUTRAL,
perform the procedure outlined under
“Shifting Into NEUTRAL”. Internal
transmission damage will result, if the
transfer case is not in NEUTRAL during
towing.
• Automatic transmissions must be
placed in PARK, and manual transmis-
sions must be placed in gear (not in
Neutral) for recreational towing.
• Towing this vehicle in violation of the
above requirements can cause severe
transmission and/or transfer case dam-
age. Damage from improper towing is
not covered under the New Vehicle Lim-
ited Warranty.
• Do not disconnect the rear driveshaft
because fluid will leak from the transfer
case, causing damage to internal parts.
• Do not use a bumper-mounted clamp-on
tow bar on your vehicle. The bumper
face bar will be damaged.
Shifting Into NEUTRAL (N)
Use the following procedure to prepare your
vehicle for recreational towing.
WARNING!
You or others could be injured or killed if
you leave the vehicle unattended with the
transfer case in the NEUTRAL (N) position
without first fully engaging the parking
brake. The transfer case NEUTRAL (N)
position disengages both the front and rear
driveshafts from the powertrain, and will
allow the vehicle to roll, even if the auto-
matic transmission is in PARK (or manual
transmission is in gear). The parking brake
should always be applied when the driver
is not in the vehicle.
CAUTION!
It is necessary to follow these steps to be
certain that the transfer case is fully in
NEUTRAL (N) before recreational towing
to prevent damage to internal parts. 1. Bring the vehicle to a complete stop on
level ground, with the engine running.
Firmly apply the parking brake.
2. Shift the transmission to NEUTRAL.
NOTE:
If vehicle is equipped with air suspension,
ensure the vehicle is set to Normal Ride
Height.
3. Press and hold the brake pedal.
4. Depress the clutch pedal on a manual transmission.
5. Shift the transfer case into NEUTRAL:
• With manual shift transfer case, shiftthe transfer case lever into NEUTRAL
(N)
• With electronic shift transfer case, push and hold the transfer case NEU-
TRAL (N) button. Some models have a
small, recessed “N” button (at the cen-
ter of the transfer case switches) that
must be pushed using a ballpoint pen
or similar object. Other models have a
rectangular NEUTRAL switch, below
the rotary transfer case control knob.
STARTING AND OPERATING
198

The NEUTRAL (N) indicator light will
blink while the shift is in progress. The
light will stop blinking (stay on solid)
when the shift to NEUTRAL (N) is com-
plete. After the shift is completed and
the NEUTRAL (N) light stays on, re-
lease the NEUTRAL (N) button.
6. Release the parking brake.
7. Shift the transmission into REVERSE.
8. Release the brake pedal (and clutch pedal on manual transmissions) for five seconds
and ensure that there is no vehicle
movement.
9. Repeat steps 7 and 8 with automatic transmission in DRIVE or manual trans-
mission in first gear.
10. Shift the transmission to NEUTRAL. Firmly apply the parking brake. Turn OFF
the engine. For vehicles with Keyless
Enter-N-Go, push and hold the ENGINE
START/STOP button until the engine
shuts off.
11. Shift the transmission into PARK or place manual transmission in gear (NOT in Neutral). On 8-speed transmissions
the shifter will automatically select
PARK when the engine is turned off.
12. Turn the ignition to the OFF mode, then cycle the ignition to the RUN mode and
back to the OFF mode. Remove the key
fob from the ignition.
13. Attach the vehicle to the tow vehicle using a suitable tow bar.
14. Release the parking brake.
NOTE:
With electronic shift transfer case:
• Steps 2 through 4 are requirements that must be met before pushing the NEUTRAL
(N) button, and must continue to be met
until the shift has been completed. If any of
these requirements are not met before
pushing the NEUTRAL (N) button or are no
longer met during the shift, the NEUTRAL
(N) indicator light will flash continuously
until all requirements are met or until the
NEUTRAL (N) button is released. • The ignition must be in the ON/RUN mode
for a shift to take place and for the position
indicator lights to be operable. If the igni-
tion is not in the ON/RUN mode, the shift
will not take place and no position indicator
lights will be on or flashing.
• A flashing NEUTRAL (N) position indicator light indicates that shift requirements have
not been met.
• If the vehicle is equipped with air suspen- sion, the engine should be started and left
running for a minimum of 60 seconds (with
all the doors closed) at least once every
24 hours. This process allows the air sus-
pension to adjust the vehicle’s ride height
to compensate for temperature effects.
Shifting Out Of NEUTRAL (N)
Use the following procedure to prepare your
vehicle for normal usage:
1. Bring the vehicle to a complete stop, leav-
ing it connected to the tow vehicle.
2. Firmly apply the parking brake.
3. Press and hold the brake pedal.
199

4. Start the engine. Shift the transmissioninto NEUTRAL. Depress the clutch pedal
on a manual transmission.
• With manual shift transfer case, shift the transfer case lever to the desired
position.
• With electronic shift transfer case with rotary selector switch, push and hold
the transfer case NEUTRAL (N) button
until the NEUTRAL (N) indicator light
turns off. After the NEUTRAL (N) indi-
cator light turns off, release the NEU-
TRAL (N) button. After the NEUTRAL
(N) button has been released, the
transfer case will shift to the position
indicated by the selector switch.
• With electronic shift transfer case with push-button selector switch, push and
hold the switch for the desired transfer
case position, until the NEUTRAL (N)
indicator light turns off and the desired
position indicator light turns on. NOTE:
When shifting out of transfer case NEUTRAL
(N), turning the engine OFF is not required,
but may be helpful to avoid gear clash. With
the 8-speed automatic transmission, the en-
gine must remain running, since turning the
engine OFF will shift the transmission to
PARK (and the transmission must be in NEU-
TRAL for the transfer case to shift out of
NEUTRAL).
5. Turn the engine OFF. Shift automatic
transmission into PARK. On 8-speed
transmissions the shifter will automati-
cally select PARK when the engine is
turned off.
6. Release the brake pedal (and clutch pedal on a manual transmission).
7. Disconnect vehicle from the tow vehicle.
8. Start the engine.
9. Press and hold the brake pedal.
10. Release the parking brake.
11. Shift the transmission into gear, release the brake pedal (and clutch pedal on
manual transmissions), and check that
the vehicle operates normally. NOTE:
With electronic shift transfer case:
• Steps 3 and 4 are requirements that must
be met before pushing the button to shift
out of NEUTRAL (N), and must continue to
be met until the shift has been completed.
If any of these requirements are not met
before pushing the button or are no longer
met during the shift, the NEUTRAL (N)
indicator light will flash continuously until
all requirements are met or until the button
is released.
• The ignition must be in the ON/RUN mode for a shift to take place and for the position
indicator lights to be operable. If the igni-
tion is not in the ON/RUN mode, the shift
will not take place and no position indicator
lights will be on or flashing.
• A flashing NEUTRAL (N) position indicator light indicates that shift requirements have
not been met.
STARTING AND OPERATING
200

Bulb Number
Premium Backup
Lamp 7440/W21W
Rear Lamp Bar ID
Marker Lamp 194
Side Marker Lamps
(Dual Rear Wheels) 194
Backup Lamp 921
Rear License Plate
Lamp 194
FUSES
WARNING!
• When replacing a blown fuse, always use
an appropriate replacement fuse with
the same amp rating as the original fuse.
Never replace a fuse with another fuse of
WARNING!
higher amp rating. Never replace a
blown fuse with metal wires or any other
material. Do not place a fuse inside a
circuit breaker cavity or vice versa. Fail-
ure to use proper fuses may result in
serious personal injury, fire and/or prop-
erty damage.
• Before replacing a fuse, make sure that
the ignition is off and that all the other
services are switched off and/or disen-
gaged.
• If the replaced fuse blows again, contact
an authorized dealer.
• If a general protection fuse for safety
systems (air bag system, braking sys-
tem), power unit systems (engine sys-
tem, transmission system) or steering
WARNING!
system blows, contact an authorized
dealer.
Power Distribution Center
The Power Distribution Center is located in
the engine compartment near the battery.
This center contains cartridge fuses, micro
fuses, relays, and circuit breakers. A descrip-
tion of each fuse and component may be
stamped on the inside cover, otherwise the
cavity number of each fuse is stamped on the
inside cover that corresponds to the following
chart.
Cavity Cartridge Fuse Micro Fuse Description
F01 80 Amp Black –Rad Fan Control Module – If Equipped
F03 60 Amp Yellow –Rad Fan – If Equipped
F05 40 Amp Green –Compressor for Air Suspension – If Equipped
F06 40 Amp Green –Antilock Brakes/Electronic Stability Control Pump
203

CavityCartridge Fuse Micro Fuse Description
F07 40 Amp Green – Starter Solenoid
F08 20 Amp Blue (1500 LD/
Cummins Diesel) –
Emissions Diesel – If Equipped
F09 40 Amp Green (Special
Services Vehicle & Cum- mins Diesel) –
Diesel Fuel Heater – If Equipped
F10 40 Amp Green –Body Controller / Exterior Lighting #2
F10 50 Amp Red –Body Controller / Exterior Lighting #2 – If Equipped with
Stop/Start
F11 30 Amp Pink –Integrated Trailer Brake Module – If Equipped
F12 40 Amp Green –Body Controller #3 / Power Locks
F13 40 Amp Green – Blower Motor
F14 40 Amp Green –Body Controller #4 / Interior Lighting
F16 30 Amp Pink –Smart Bar – If Equipped
F19 20 Amp Blue (1500 LD
Diesel)
30 Amp Pink (Cummins Diesel) –
SCR – If Equipped
F20 30 Amp Pink –Passenger Door Module
F21 30 Amp Pink –Drive Train Control Module
F22 20 Amp Blue
30 Amp Pink (Cummins Diesel) –
Engine Control Module
F23 30 Amp Pink –Body Controller #1 / Interior Lighting
F24 30 Amp Pink –Driver Door Module
IN CASE OF EMERGENCY
204

CavityCartridge Fuse Micro Fuse Description
F25 30 Amp Pink – Front Wiper
F26 30 Amp Pink –Antilock Brakes / Stability Control Module / Valves
F28 20 Amp Blue –Trailer Tow Backup Lights – If Equipped
F29 20 Amp Blue –Trailer Tow Parking Lights – If Equipped
F30 30 Amp Pink –Trailer Tow Receptacle
F31 30 Amp Pink (1500 LD
Diesel) –
Urea Heater Control – If Equipped
F32 –– Spare Fuse
F33 20 Amp Blue –Special Services Vehicle Only
F34 30 Amp Pink –Vehicle System Interface Module #2 – If Equipped
F35 30 Amp Pink –Sunroof – If Equipped
F36 30 Amp Pink –Rear Defroster – If Equipped
F37 30 Amp Pink –Cummins Diesel Fuel Heater #2 – If Equipped
F38 30 Amp Pink –Power Inverter 115V AC – If Equipped
F39 20 Amp Blue –Power Outlet – Special Services Only
F41 –10 Amp Red Active Grill Shutter – If Equipped
F42 –20 Amp Yellow Horn
F44 –10 Amp Red Diagnostic Port
F46 –10 Amp Red Upfitter – If Equipped
F49 –10 Amp Red Instrument Panel Cluster (Except Fleet Vehicles)
F50 –20 Amp Yellow Air Suspension Control Module – If Equipped
F51 –10 Amp Red Ignition Node Module / Keyless Ignition (Instrument
Panel Cluster – Fleet Vehicles Only)
205

CavityCartridge Fuse Micro Fuse Description
F52 –5 Amp Tan Battery Sensor
F53 –20 Amp Yellow Trailer Tow – Left Turn/Stop Lights
F54 –20 Amp Yellow Adjustable Pedals
F56 –15 Amp Blue Additional Diesel Content – If Equipped
F57 –20 Amp Yellow Transmission
F58 –20 Amp Yellow Spare Fuse
F59 –10 Amp Red SCR Relay – If Equipped
F60 –15 Amp Blue Underhood Lamp
F61 –10 Amp Red (1500 LD Die-
sel & Cummins Diesel) PM Sensor – If Equipped
F62 –10 Amp Red Air Conditioning Clutch
F63 –20 Amp Yellow Ignition Coils (Gas), Urea Heater (Cummins Diesel)
F64 –25 Amp Clear Fuel Injectors / Powertrain
F65 –– Spare Fuse
F66 –10 Amp Red Sunroof / Passenger Window Switches / Rain Sensor
F67 –10 Amp Red CD / DVD / Bluetooth Hands-free Module – If Equipped
F69 –15 Amp Blue Mod SCR 12V (Cummins Diesel) – If Equipped
F70 –30 Amp Green Fuel Pump Motor
F71 –25 Amp Clear Amplifier
F72 –10 Amp Red PCM – If Equipped
F73 –20 Amp Yellow Fuel Transfer Pump (HD Only) – If Equipped
F74 –20 Amp Yellow (Gas Engine
& 1500 LD Diesel) Brake Vacuum Pump Gas/Diesel – If Equipped
IN CASE OF EMERGENCY
206

CavityCartridge Fuse Micro Fuse Description
F75 –10 Amp Red Coolant Temperature Valve Actuator
F76 –10 Amp Red Antilock Brakes / Electronic Stability Control
F77 –10 Amp Red Drivetrain Control Module/Front Axle Disconnect Module
F78 –10 Amp Red Engine Control Module / Electric Power Steering
F79 –15 Amp Blue Clearance Lights
F80 –10 Amp Red Universal Garage Door Opener / Compass
F81 –20 Amp Yellow Trailer Tow Right Turn / Stop Lights
F82 –10 Amp Red Steering Column Control Module / Cruise Control
F84 –15 Amp Blue Switch Bank / Instrument Cluster
F85 –10 Amp Red Airbag Module
F86 –10 Amp Red Airbag Module
F87 –10 Amp Red Air Suspension – If Equipped / Trailer Tow / Steering Col-
umn Control Module
F88 –15 Amp Blue Instrument Panel Cluster
F90/F91 –20 Amp Yellow Power Outlet (Rear Seats) Customer Selectable
F93 –20 Amp Yellow Cigar Lighter
F94 –10 Amp Red Shifter / Transfer Case Module
F95 –10 Amp Red Rear Camera / Park Assist
F96 –10 Amp Red Rear Seat Heater Switch
F97 –25 Amp Clear Rear Heated Seats & Heated Steering Wheel – If
Equipped
F98 –25 Amp Clear Front Heated Seats – If Equipped
F99 –10 Amp Red Climate Control
207