Chrysler RAM TRUCK 2500 1994 Service Manual page 506

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POWER DOOR LOCKS 8P - 1
POWER DOOR L O C K S
CONTENTS
SERVICE PROCEDURES
page
... 3
TEST PROCEDURES
page
... 1
GENERAL INFORMATION
The door lock motors are controlled by two-way
switches. Tb lock the doors, push either switch to the
rear. Tb unlock doors from inside the vehicle push ei­
ther switch forward.
The power door locks do not lock or unlock the
doors from outside the vehicle. Insert key into lock
cylinder to lock or unlock each individual door.
T E S T P R O C E D U R E S
Both doors can also be unlocked by using the inside
remote door handles. Both doors can also be opened
with the inside door handle without first lifting the
plunger.
DESCRIPTION
The door locks are operated by reversible motors.
The voltage supply comes from the 50 amp fuse, cav­
ity 5, in the power distribution center (PDC) to the
20 amp fuse located in cavity 19 of the fuseblock
module. Power then goes to both door switches. With
the left door switch in LOCK position, voltage travels
from the left switch to the right door switch. Voltage
is then applied to both lock motors. Ground is found
through the right door switch then the left door
switch (Fig. 2).
The right door lock/window switch operates the
same as the driver's door switch. The voltage and
ground paths are reversed to unlock the doors.
The power door lock operates with battery power
and, therefore, is independent of the ignition switch.
SWITCH TEST
(1) For switch testing, remove the switch from its
mounting location as described in the Service Proce­
dures section of this group.
(2) Using an ohmmeter, refer to Fig. 1 to deter­
mine if continuity is correct in the lock and unlock
switch positions. If these results are not obtained, re­
place the switch.
DIAGNOSING POWER DOOR LOCKS
For complete circuit diagrams refer to Group
8W - Wiring Diagrams.
Check fuse i n cavity 5 of P D C and cavity 19 of
fuseblock module. Replace as required.
(1) Measure voltage at output side of fuses. Meter
should read battery voltage. If not, repair open in cir­
cuit to fuse.
®
3
its
SWITCH
POSITION
CONTINUITY
BETWEEN
OFF
PINS 1 & 4
PINS 2 & 5
LOCK
PINS 2 & 3
PINS 1 & 4
UNLOCK
PINS 3 & 4
PINS 2 & 5
PIN IDENTIFICATION
PIN SIDE OF SWITCH
898P-5
Fig. 1 Door Lock Switch Continuity
(2) Measure voltage at lock terminal (cavity 3) of
door switch connectors. Meter should read battery
voltage. If not, repair open circuit between fuse cav­
ity 19 and switch.
(3) Remove left door switch. Measure resistance at
cavities 2 and 4 of left door switch connector to
ground. Meter should read zero ohms. If not, repair
open in circuit to ground. If OK, install left door
switch.
(4) Remove right door switch. Measure resistance
between cavities 2 and 4 of right door switch connec­
tor to ground. Meter should read zero ohms. If not,
repair open in circuit between switches. If OK, install
right door switch.
(5) At the motor connector, check for battery volt­
age at either terminal with a door switch moved to
lock or unlock position. If OK, replace motor. If not,
repair open in circuit to motor.