Dodge RAM TRUCK 1500 1995 Service Manual page 510

B R
— — — — P O W E R SEATS 8R - 1
POWER SEATS
CONTENTS
page page
DIAGNOSIS ....................... 1 8ERWICE P R O C E D U R E S 3
G E N E R A L INFORMATION 1
G E N E R A L INFORMATION
A six-way driver's side power seat is an available
option on Ram truck models. The power seat system
receives battery feed through fuse 1 in the power dis­
tribution center and circuit breaker 2 in the fuse-
block module at all times.
Following are general descriptions of the major
components in the power seat system. Refer to Group
8W - Wiring Diagrams for complete circuit descrip­
tions and diagrams.
POWER SEAT SWITCH
The power seat can be adjusted in six different
ways using the power seat switch. The switch is lo­
cated on the lower outboard side of the seat. Refer to
the owner's manual for more information on power
seat switch functions and seat adjusting procedures.
The individual switches cannot be repaired. If one
switch fails, the entire switch module must be re­
placed.
POWER SEAT ADJUSTER/MOTORS
There are three reversible motors that operate the
power seat adjuster. The motors are connected to
worm-drive gearboxes in the adjuster by drive cables.
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 front and
rear motors operate in 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 in the selected direction until the switch is re­
leased, or until the travel limit of the power seat ad­
juster is reached. When the switch is moved in 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 di­
rection.
Each motor contains a self-resetting circuit breaker
to protect it from overload. Consecutive or frequent
resetting must not be allowed to continue or the mo­
tors may be damaged. Make the necessary repairs.
The power seat adjuster and motors can not be re­
paired, and are serviced only as a complete unit. If
any component in this unit should fail, the entire as­
sembly must be replaced.
DIAGNOSIS
Before any testing is attempted the battery should
be fully charged and all connections and pins cleaned
and tightened to ensure proper continuity and
grounds.
With the dome lamp on, apply switch in direction
of the failure. If the dome lamp dims, the seat may
be jamming. Check for binding or obstructions. If the
dome lamp does not dim, then proceed with the fol­
lowing electrical tests.
POWER SEAT ADJUSTER/MOTORS
Operate the power seat switch to move all three
seat motors. The seat should move in all directions.
If not OK, proceed as follows. If one or more motors
operate, see diagnosis for Power Seat Switch.
(1) Check circuit breaker 2 in the fuseblock mod­
ule. If OK, go to next step. If not OK, replace circuit
breaker.