Dodge RAM TRUCK 1500 1995 Service Manual page 507

B R
POWER LOCKS 8P - 1
POWER LOCKS
C O N T E N T S
page ' page
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SERVICE PROCEDURES 2
GENERAL INFORMATION 1
G E N E R A L I N F O R M A T I O N
Power door locks are optional'equipment on Ram
truck models. Both doors can be locked or unlocked
electrically by operating the switch on either door
panel. The power door locks operate with battery
power supplied independent of the ignition switch.
Following are general descriptions of the major
components in the power door lock system. Refer to
Group 8 W - Wiring Diagrams for complete circuit de­
scriptions and diagrams.
POWER LOOK SWITCH
The power door locks are controlled by a two-way
switch mounted on the trim panel of each door. The
switch controls both the battery and ground feeds to
the door lock motors. The battery and ground feeds
are reversed between the LOCK and UNLOCK
switch positions. The door lock switches can not be
repaired. If faulty, the entire switch must be re­
placed.
POWER LOCK MOTOR
The door locks are operated by a reversible motor
mounted within each door. The motor direction is
controlled by the battery and ground feeds from the
door lock switches. The motor can not be repaired. If
faulty, the entire motor must be replaced.
D I A G N O S I S
POWER LOCI SWITCH
(1) Check fuse 19 in fuseblock module. If OK, go to
next step. If not OK, replace fuse.
(2) Check for battery voltage at fuse 19. If OK, go
to next step. If not OK, repair circuit from power dis­
tribution center.
(3) Remove switch from trim panel. See Power
Lock Switch Remove/Install. Carefully separate mul­
tiple terminal block on wiring harness from switch
body.
(4) Check continuity between switch connector cav­
ity for switch pin 2 and a good ground. Repeat check
between cavity for switch pin 4 and a good ground.
In each case, there should be continuity. If OK, go to
next step. If not OK, repair circuit to ground as re­
quired.
(5) Check for battery voltage at switch connector
cavity for switch pin 5. If OK, go to next step. If not
OK, repair circuit to fuse 19 in the fuseblock module.
(6) Test switch continuity. See Switch Continuity
chart (Fig. 1) to determine if continuity is correct in
the OFF, LOCK and UNLOCK switch positions. If
OK, go to Power Lock Motor diagnosis. If not OK, re­
place the switch.
O
2
®
1
V
3
®
4
o
D -
SWITCH
POSITION
CONTINUITY
BETWEEN
OFF
PINS 1 & 4
PINS 2 & 3
UNLOCK
(UP)
PINS 1 & 4
PINS 3 & 5
LOCK
(DOWN)
PINS 2 & 3
PINS 1 & 5
PIN IDENTIFICATION
PIN SIDE OF SWITCH
J958P-1
Fig. 1 Switch Continuity