Dodge Ram Truck 1500-2500-3500. Manual — part 571
SEAT BELT TENSION REDUCER
DESCRIPTION
A seat belt tension reducer (5) is standard equipment
for the driver side front outboard seat belt on standard
cab versions of this model. The tension reducer is
integral to the driver side front outboard seat belt and
retractor unit, which is secured to the inner B-pillar on
the left side of the vehicle. The retractor is concealed
beneath the molded plastic inner B-pillar trim.
The seat belt tension reducer consists primarily of a
12-volt Direct Current (DC) solenoid and an integral
connector receptacle (6) that is located on the forward
facing end housing of the retractor. The seat belt ten-
sion reducer is controlled by a battery current output
of the ignition switch and a ground path provided by
the seat belt switch, and is connected to the vehicle
electrical system through a dedicated take out of the
body wire harness by a keyed and latching molded
plastic
connector
insulator
to
ensure
a
secure
connection.
The seat belt tension reducer cannot be repaired and, if faulty or damaged, the entire driver side front outboard seat
belt and retractor unit must be replaced. (Refer to 8 - ELECTRICAL/RESTRAINTS/FRONT OUTBOARD SEAT BELT
& RETRACTOR - REMOVAL).
OPERATION
The seat belt tension reducer is controlled by a ground signal received from the seat belt switch on the seat belt
switch sense circuit and a battery current signal received from the ignition switch on the fused ignition switch output
(run-accessory) circuit. When the seat belt switch is closed (the driver side front seat belt is fastened) and the igni-
tion switch is in the On or Accessory positions, the seat belt tension reducer solenoid is energized.
When the solenoid is energized, it actuates a mechanism within the driver side front outboard seat belt retractor to
reduce the normal recoil spring tension exerted by the retractor spool, which is designed to reel in the seat belt
webbing onto the spool. When the driver side seat belt is unbuckled or if the ignition switch is turned to any position
except On or Accessory, the tension reducer solenoid is de-energized and the normal recoil spring tension of the
retractor is restored.
The action of the seat belt tension reducer results in improved seat belt comfort for the driver. Reducing the seat
belt retractor recoil spring tension is desirable on standard cab models of this vehicle and not on the quad cab
model due to the different mounting position required for the seat belt turning loop on the B-pillar relative to the
driver’s seat position on the standard cab model. The seat belt tension reducer may be diagnosed using conven-
tional diagnostic tools and methods.
DIAGNOSIS AND TESTING
SEAT BELT TENSION REDUCER
Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and con-
nector repair procedures, details of wire harness routing and retention, connector pin-out information and location
views for the various wire harness connectors, splices and grounds.
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact
sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative
(ground) cable, then wait two minutes for the system capacitor to discharge before performing further diag-
nosis or service. This is the only sure way to disable the supplemental restraint system. Failure to take the
proper precautions could result in accidental airbag deployment.
8O - 318
RESTRAINTS - SERVICE INFORMATION
DR/DH
1. Disconnect and isolate the battery negative cable. Disconnect the body wire harness connector for the seat belt
tension reducer from the tension reducer connector receptacle on the driver side front outboard seat belt and
retractor unit. Using an ohmmeter, measure the resistance between the seat belt switch sense circuit terminal pin
and the fused ignition switch output (run-accessory) circuit terminal pin in the tension reducer connector recep-
tacle on the retractor. Resistance through the tension reducer solenoid coil should be 53 ohms at 20° C (68° F).
If OK, go to Step 2. If not OK, replace the faulty driver side front outboard seat belt and retractor unit.
2. Check for continuity between the seat belt switch sense circuit cavity of the body wire harness connector for the
seat belt tension reducer and a good ground. There should be continuity with the driver side front seat belt buck-
led, and no continuity with the driver side front seat belt unbuckled. If OK, go to Step 3. If not OK, repair the
shorted or open seat belt switch sense circuit between the tension reducer and the seat belt switch as required.
3. Reconnect the battery negative cable. Check for battery current at the fused ignition switch output (run-acces-
sory) circuit of the body wire harness connector for the seat belt tension reducer. There should be battery current
with the ignition switch in the On or Accessory positions, and no battery current with the ignition switch in any
other position. If not OK, repair the shorted or open fused ignition switch output (run-accessory) circuit between
the tension reducer and the ignition switch as required.
SEAT BELT TURNING LOOP ADJUSTER
REMOVAL
WARNING: To avoid personal injury or death, during and following any seat belt or child restraint anchor
service, carefully inspect all seat belts, buckles, mounting hardware, retractors, tether straps, and anchors
for proper installation, operation, or damage. Replace any belt that is cut, frayed, or torn. Straighten any
belt that is twisted. Tighten any loose fasteners. Replace any belt that has a damaged or inoperative buckle
or retractor. Replace any belt that has a bent or damaged latch plate or anchor plate. Replace any child
restraint anchor or the unit to which the anchor is integral that has been bent or damaged. Never attempt to
repair a seat belt or child restraint component. Always replace damaged or faulty seat belt and child
restraint components with the correct, new and unused replacement parts listed in the DaimlerChrysler
Mopar Parts Catalog.
1. Unsnap and remove the trim cover from the front
outboard seat belt turning loop to access the screw
that secures the turning loop to the height adjuster
(2) on the upper inner B-pillar (1). Discard the
removed turning loop trim cover as it is not
intended for reuse.
2. Remove the screw that secures the seat belt turn-
ing loop to the height adjuster.
3. Remove the front seat belt turning loop from the
height adjuster.
4. Remove the upper trim from the inner B-pillar.
(Refer to 23 - BODY/INTERIOR/B-PILLAR UPPER
TRIM - REMOVAL).
5. Loosen the two screws (3) that secure the seat belt
turning loop height adjuster far enough to remove
the adjuster from the upper B-pillar.
6. Disengage the tab near the lower end of the seat belt turning loop height adjuster from the slot in the sheet
metal and remove the adjuster from the inner B-pillar.
DR/DH
RESTRAINTS - SERVICE INFORMATION
8O - 319
INSTALLATION
WARNING: To avoid personal injury or death, during and following any seat belt or child restraint anchor
service, carefully inspect all seat belts, buckles, mounting hardware, retractors, tether straps, and anchors
for proper installation, operation, or damage. Replace any belt that is cut, frayed, or torn. Straighten any
belt that is twisted. Tighten any loose fasteners. Replace any belt that has a damaged or inoperative buckle
or retractor. Replace any belt that has a bent or damaged latch plate or anchor plate. Replace any child
restraint anchor or the unit to which the anchor is integral that has been bent or damaged. Never attempt to
repair a seat belt or child restraint component. Always replace damaged or faulty seat belt and child
restraint components with the correct, new and unused replacement parts listed in the DaimlerChrysler
Mopar Parts Catalog.
1. Position the front seat belt turning loop adjuster (2)
to the inner B-pillar (1).
2. Engage the tab near the lower end of the seat belt
turning loop height adjuster into the slot in the
sheet metal of the inner B-pillar.
3. Hand tighten the lower of the two screws (3) that
secure the seat belt turning loop height adjuster to
the upper B-pillar far enough to keep the tab on the
lower end of the adjuster engaged in the B-pillar
slot.
4. Install the upper screw that secures the seat belt
turning loop height adjuster to the upper B-pillar,
then tighten both the upper and lower screws to 40
N·m (29 ft. lbs.).
5. Reinstall the upper trim onto the inside of the B-pil-
lar. (Refer to 23 - BODY/INTERIOR/B-PILLAR
UPPER TRIM - INSTALLATION).
6. Position the seat belt turning loop onto the height adjuster on the upper inner B-pillar.
7. Install and tighten the screw that secures the seat belt turning loop to the height adjuster. Tighten the screw to
40 N·m (29 ft. lbs.).
8. Engage the lower snap features of the new trim cover over the front outboard seat belt turning loop and, using
hand pressure, press firmly and evenly on the top of the trim cover until it snaps into place.
8O - 320
RESTRAINTS - SERVICE INFORMATION
DR/DH
SPEED CONTROL
TABLE OF CONTENTS
page
page
SPEED CONTROL
. . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DIAGNOSIS AND TESTING - VACUUM
SUPPLY TEST . . . . . . . . . . . . . . . . . . . . . . . . . 2
DIAGNOSIS AND TESTING - ROAD TEST
CABLE-SPEED CONTROL
. . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . 5
SERVO
. . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . . . . . . . . . . 7
SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . 9
RESERVOIR-VACUUM
. . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
. . . . . . . . . . . . . . . . . . . . . . . . . 11
SPEED CONTROL
DESCRIPTION
All 3.7L / 4.7LGas Engines
The speed control system is operated by the use of a cable and a vacuum controlled servo. Electronic control of the
speed control system is integrated into the Powertrain Control Module (PCM). The controls consist of two steering
wheel mounted switches. The switches are labeled: ON/OFF, RES/ACCEL, SET, COAST, and CANCEL.
The system is designed to operate at speeds above 30 mph (50 km/h).
WARNING: THE USE OF SPEED CONTROL IS NOT RECOMMENDED WHEN DRIVING CONDITIONS DO NOT
PERMIT MAINTAINING A CONSTANT SPEED, SUCH AS IN HEAVY TRAFFIC OR ON ROADS THAT ARE WIND-
ING, ICY, SNOW COVERED, OR SLIPPERY.
5.7L Gas / 5.9L Diesel
The speed control system is fully electronically controlled by the Powertrain Control Module (PCM). If equipped with
a diesel engine, electronic control of the speed control system is integrated into the Engine Control Module (ECM).
A cable and a vacuum controlled servo are not used. This is a servo-less system. The controls consist of two
steering wheel mounted switches. The switches are labeled: ON/OFF, RES/ACCEL, SET, COAST, and CANCEL.
The system is designed to operate at speeds above 30 mph (50 km/h).
WARNING: THE USE OF SPEED CONTROL IS NOT RECOMMENDED WHEN DRIVING CONDITIONS DO NOT
PERMIT MAINTAINING A CONSTANT SPEED, SUCH AS IN HEAVY TRAFFIC OR ON ROADS THAT ARE WIND-
ING, ICY, SNOW COVERED, OR SLIPPERY.
DR/DH
SPEED CONTROL
8P - 1
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