Chrysler Conquest 1988 Service Manual page 290

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8-278 ETACS
- Central Door Locking System
Door LockActuator
(All doors)
SWHCh
._-
1
I -
PTC thermistor
Motor
16R1371
TROUBLESHOOTING GUIDE
Trouble Svmptom
Zentral door locking system
doesn't functron when
Joor lock knob is pressed
jown or pulled up.
tCl.J: Electronrc Control Unit
L
Located at the locking mechanism of eactl door.
These are motor-type actuators; according to the door lock or unlock
relay opertion, they make door lock or unlock motion.
In addition, a PTC thermistor is located in series in the motor circurtj
when the motor load is excessive, it functions-as a fuse~to protect--
the motor.
-~
Note that the PTC thermistor again becomes conductive if there is_=
a decrease to the ordinarytemperature.
PTC: PositiveTemperature Coefficient
Cause
Damaged or drsconnected
wiring, or short-circuit,
of door actuator switch
input circuit
.-
Malfunction of the front
door lock actuator switch
Damaged or disconnected
wiring of the door lock
relay or door unlock
relay power-supply clrcult
Fuse @ IS fused.
Damaged or disconnected
wiring of door lock relay
or door unlock relay
drive crrcuit
Malfunctton of the door lock
relay or door unlock relay
Damaged or disconnected
wiring of door lock
actuator drive crrcurt
Malfunction of the door
lock actuator
Malfunctton of the ECU
Check method
If input checks (P.8-296)
indicate a malfunction,
check by using check
chart No. 13 (P.8-313).
Check by using check
chart No. 14 (P.8.3141.
Check by using check
chart No. 15 (P.8-315).
Check by using check
chart No. 16 jP.8.316).
Remedy
Repair the harness or
replace the door lock
actuator.
Repair the harness or
replace the fuse.
Repair the harness or
replace the door lock
relay or door unlock
relav.
Repair the harness or
replace the door lock
actuator.
Replace the ECU.