Dodge ram truck 3500 1996 Service Manual page 521

B R POWER SEAT SYSTEMS 8R -1
POWER SEAT S Y S T E M S
C O N T E N T S
page
GENERAL INFORMATION
INTRODUCTION 1
DESCRIPTION AND OPERATION
CIRCUIT BREAKER 1
POWER SEAT ADJUSTER/MOTORS 1
POWER SEAT SWITCH 1
DIAGNOSIS AND TESTING
CIRCUIT BREAKER 2
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POWER SEAT ADJUSTER/MOTORS 2
POWER SEAT SWITCH 2
POWER SEAT SYSTEM 1
REMOVAL AND INSTALLATION
POWER SEAT ADJUSTER/MOTORS 3
POWER SEAT SWITCH 3
G E N E R A L I N F O R M A T I O N
INTRODUCTION
• A six-way driver's side power seat is an available
factory-installed option for this model. The power
seat system receives battery feed through a fuse in
the power distribution center and a circuit breaker i n
the fuseblock module at all times.
Following are general descriptions of the major
components In the power seat system. Refer to 8W-63
- Power Seat in Group 8 W - Wiring Diagrams for
complete circuit descriptions and diagrams.
D E S C R I P T I O N A N D O P E R A T I O N
POWER SEAT SWITCH
The power seat can be adjusted in six different
ways using the power seat switch. The switch is
located on the lower outboard side of the seat cushion
frame. Refer to the owner's manual for more informa­
tion on power seat switch functions and seat adjust­
ing procedures. The individual switches cannot be
repaired. I f one switch fails, the entire switch module
must be replaced.
POWER SEAT ADJUSTER/MOTORS
There are three reversible motors that operate the
power seat adjuster. The motors are connected to
worm-drive gearboxes that move the seat adjuster
through a combination of drive cables and screw-type
drive units.
The front and rear of a seat are operated by differ­
ent motors. They can be raised or lowered indepen­
dently of each other. When the center seat switch is
pushed to the Up or Down position, both the front
and rear motors operate i n unison, moving the entire
seat up or down. The forward-rearward motor is
operated by pushing the center seat switch to the
Forward or Rearward position.
When a switch is actuated, battery feed and a
ground path are applied through the switch contacts
to the motor(s). The motor(s) operate to move the
seat i n the selected direction until the switch is
released, or until the travel limit of the power seat
adjuster is reached. When the switch is moved i n the
opposite direction, the battery feed and ground path
to the motor(s) are reversed through the switch con­
tacts. This causes the motor to run in the opposite
direction.
Each motor contains a self-resetting circuit breaker
to protect i t from overload. Consecutive or frequent
resetting of the circuit breakers must not be allowed
to continue, or the motors may be damaged. Make
the necessary repairs.
The power seat adjuster and motors cannot be
repaired, and are serviced only as a complete unit. I f
any component in this unit should fail, the entire
assembly must be replaced.
CIRCUIT BREAKER
An automatic resetting circuit breaker i n the fuse-
block module Is used to' protect the power seat sys­
tem circuit. The circuit breaker can protect the
system from a short circuit, or from an overload con­
dition caused by an obstructed or stuck seat adjuster.
The circuit breaker cannot be repaired. I f faulty, i t
must be replaced.
D I A G N O S I S A N D T E S T I N G
POWER SEAT SYSTEM
For circuit descriptions and diagrams, refer to
8W-63 - Power Seat In Group 8 W - Wiring Diagrams.
Before any testing is attempted, the battery should
be fully-charged and all connections and pins cleaned