Dodge ram truck 3500 1996 Service Manual page 517

B R POWER LOCI SYSTEMS 8P - 1
POWER L O C K S Y S T E M S
C O N T E N T S
page
page
GENERAL INFORMATION
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1
OESCRiPTlON ANi OPERATION
POWER LOCK MOTOR 1
POWER LOCK SWITCH . . . . . . . . . . . . . . . . . . . 1
OlAGNOSIS ANO TESTING
POWER LOCK MOTOR 2
POWER LOCK SWITCH 1
REMOVAL ANO INSTALLATION
POWER LOCK MOTOR 3
POWER LOCK SWITCH 2
G E N E R A L I N F O R M A T I O N
INTRODUCTION
Power door locks are optional factory-installed equip­
ment on this model. All doors can be locked and
unlocked electrically by operating the switch on either
front door panel. The power door locks operate with bat­
tery power supplied independent of the ignition switch.
Following are general descriptions of the major
components i n the power lock system. Refer to 8W-61
- Power Door Locks in Group 8W - Wiring Diagrams
for complete circuit descriptions and diagrams. Refer
to the owner's manual for more information on the
features and use of this system.
D E S C R I P T I O N A N D O P E R A T I O N
POWER LOCK SWITCH
The power locks are controlled by a two-way switch
mounted in a bezel on the trim panel of each front door.
The switch controls both the battery and ground feeds
to the power lock motors. The battery and ground feeds
are reversed between the Lock and Unlock switch posi­
tions. The power lock switches cannot be repaired. I f
faulty, the entire switch must be replaced.
POWER LOCK MOTOR
In the power lock system, the locks are actuated by
a reversible motor mounted within each door. The
motor direction is controlled by the battery and
ground feeds from the power - lock switches. The
power lock motor cannot be repaired. I f faulty, the
entire motor must be replaced.
D I A G N O S I S A N D T E S T I N G
POWER LOCI SWITCH
For circuit descriptions and diagrams, refer to 8W-61
- Power Door Locks in Group 8W - Wiring Diagrams.
(1) Check the fuse in the fuseblock module. I f OK,
go to Step 2. I f not OK, replace the faulty fuse.
(2) Check for battery voltage at the fuse in the
fuseblock module. I f OK, go to Step 3. I f not OK,
repair the open circuit as required.
(3) Remove the power lock switch from the trim
panel as described in this group. Carefully separate
the multiple terminal block on the wiring harness
from the switch body.
(4) Check for battery voltage at the fused B(+) cir­
cuit cavity of the switch connector, i f OK, go to Step
5. i f not OK, repair the open circuit to the fuse in the
fuseblock module.
(5) Test the switch continuity. See the Switch Conti­
nuity chart to determine i f the continuity is correct in
the Off, Lock, and Unlock switch positions (Fig. 1). I f
OK, go to Step 6. I f not OK, replace the faulty switch.
O
2
©
1
3
4
o
D -
SWITCH
POSITION
CONTINUITY
BETWEEN
OFF
PINS 1 & 4
PINS 2 & 3
UNLOCK
(UP)
PINS 1 & 4
P I N S 3 & 5
LOCK
(DOWN)
PINS 2 6c 3
PINS 1 & 5
PIN IDENTIFICATION
PIN SIDE OF SWITCH
J958P-
Fig. 1 Switch Continuity