Chrysler Conquest 1988 Service Manual page 307

ETACS
- Theft-alarm System
Trouble Symptom
The headlights flash during an
alarm test, but the theft-alarm
horn does not sound.
Cause Check method Remedy
Damaged or disconnected Check by using check Repair the harness or
wiring of horn relay drive chart No. 30 (P.8-335). replace the diode
D2
circuit or the horn relay.
Damaged or disconneted
wiring of diode
D2.
Malfunction of the horn
relay
Damaged or disconnected Check by using Repair the harness.
wiring of horn relay power check chart
supply circuit No. 31 (P.8-336).
Damaged or disconnected Check by using check Repair the harness or
wiring of theft-alarm horn chart No. 32 (P.8-338). replace the theft-alarm
drive circuit horn.
Malfunction of the theft-
alarm horn
The system is not deactivated
when, during an alarm test in
which the alarm is intentionally
activated, the door or rear hatch
is unlocked by using the key.
gTke;yzZem also cannot be drs-
Damaged or disconnected If input checks (P.8-296) Repair the harness or
wiring of key cylinder un- indicate a malfunction, replace the key cylin-
lock switch input circuit check by using check der.
chart No. 24 (P.8-327).
Malfunction of the key
cylinder unlock switch
The theft-alarm horn sounds
when the passing switch is
operated with the ignition
switch at ACC or ON position.
Malfunction of the ECU
-
Short-circuit of diode DI Check the diode.
Replace the ECU.
Replace the diode DI.
ECU: Electronic Control Unit
NOTE
(I) If there is abnormally excessive play in the installation of the key cylinder unlock switch of the trunk and for doors, or
if there is improper installation, or if there is a malfunction of the switch itself, the signals to disarm the system and
to deactivate the alarm won't be sent to the ECU.
In this instance, after the system has been armed the alarm will be activated even if the door is
opened by using the
(2) !?&ere is a malfunction of the key cylinder unlock switch system (damaged or disconnected wiring, or short-circuit)
thus making it necessary to prevent an incorrect (accidental) alarm, the system should not be armed by using the key
to lock when all the doors are closed.
16Y3540
Inspection of Diode
Using the ohmmeter, check the continuity by contacting the
probes to the diode connector for two directions.
If the continuity exists only in one direction, the diode is normal.
If the continuity exists in both directions, or there is no
continuity, the diode is faulty.