Installation - Outboard; Seat Belt Switch; Seat Belt Tensioner; Description - Mercedes-Benz 2005 Sprinter Service Manual

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VA
REAR SEAT BELT BUCKLE (Continued)

INSTALLATION - OUTBOARD

WARNING: DURING AND FOLLOWING ANY SEAT
BELT SERVICE, CAREFULLY INSPECT ALL SEAT
BELTS,
BUCKLES,
RETRACTORS,
AND
INSTALLATION,

OPERATION,

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. NEVER ATTEMPT TO REPAIR
A SEAT BELT COMPONENT. ALWAYS REPLACE
DAMAGED OR FAULTY SEAT BELT COMPONENTS
WITH
THE
CORRECT,
REPLACEMENT
PARTS
DAIMLERCHRYSLER MOPAR PARTS CATALOG.
(1) Position the rear seat belt buckle to the right
outboard side of the rear seat cushion frame (Fig.
37).
(2) Install and tighten the screw that secures the
outboard rear seat belt buckle to the rear seat cush-
ion frame. Tighten the screw to 35 N·m (26 ft. lbs.).
(3) Reinstall the plastic cover onto the screw that
secures the rear seat belt buckle to the right out-
board side of the rear seat cushion frame.

SEAT BELT SWITCH

DESCRIPTION

The seat belt switch is a small, normally closed,
single pole, single throw, leaf contact, momentary
switch. Only one seat belt switch is installed in the
vehicle, and it is integral to the driver side front seat
belt buckle unit. The seat belt switch is connected to
the vehicle electrical system through a two-wire pig-
tail wire harness and connector to a dedicated take
out and connector of the vehicle wire harness located
within the driver side front seat riser.
The seat belt switch cannot be adjusted or repaired
and, if faulty or damaged, the entire driver side seat
belt buckle unit must be replaced.
OPERATION
The seat belt switch is designed to control a path
to ground for the seat belt switch sense input of the
Electro-Mechanical Instrument Cluster (EMIC). The
seat belt switch contact is actuated by the seat belt
latch plate being inserted in to the buckle. When the
seat belt latch plate is inserted into the buckle far
enough to be engaged by the seat belt buckle latch,
the switch leaf contact opens the seat belt switch
MOUNTING
HARDWARE,
ANCHORS
FOR
PROPER
OR
DAMAGE.
NEW
AND
UNUSED
LISTED
IN
sense circuit ground path; and, when the seat belt
latch plate is released and extracted from the seat
belt buckle latch the switch leaf contact is released,
closing the circuit to ground.
The seat belt switch is connected is series between
ground and the seat belt switch sense input of the
instrument cluster. The seat belt switch receives
ground at all times through its pigtail wire connec-
tion to the vehicle wire harness from another take
out of the vehicle wire harness. An eyelet terminal
connector on the vehicle wire harness ground take
out is secured under a nut to a ground stud located
on the floor panel within the driver side front seat
riser. The seat belt switch may de diagnosed using
conventional diagnostic tools and methods.

SEAT BELT TENSIONER

THE
DESCRIPTION
Fig. 38 Seat Belt Tensioner
1 - TURNING LOOP
2 - LATCH PLATE
3 - LOWER ANCHOR
4 - RETRACTOR
5 - TENSIONER
Front seating position seat belt tensioners supple-
ment the standard driver and optional passenger air-
bags for all versions of this model. When equipped,
the seat belt tensioner is integral to the front seat
belt and retractor units, which are secured to the
inner B-pillars of the vehicle (Fig. 38). Each retractor
is concealed beneath the molded plastic B-pillar trim.
The seat belt tensioner consists primarily of a tubu-
RESTRAINTS 8O - 31

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