Mitsubishi 3000GT - Page 718

54-222
CHASSIS ELECTRICAL - Theft-alarm System
TROUBLESHOOTING QUICK-REFERENCE TABLE
For information concerning the locations of electrical components, refer to GENERAL-Theft-alarm System
Circuit.
1. ARMING / DISARMING RELATIONSHIP
Trouble symptom
The system is not armed (The
SECURITY light doesn’t illumi-
nate, and the alarm doesn’t func-
tion.)
(The central door locking system
functions normally.
If the central locking system does
not function normally, refer to
GROUP 42.)
The arming procedures are fol-
lowed, but the SECURITY light
does not illuminate.
(There is an alarm, however,
when an alarm test is conducted
after about 20 seconds have
passed.)
The alarm sounds in error when,
while the system is armed, a door
or the liftgate is unlocked by us-
ing the key.
I
Cause
Damaged or disconnected
wiring of ECU power sup-
ply circuit
Damaged or disconnected
wiring of door switch input
circuit
Damaged or disconnected
wiring of SECURITY light
activation circuit.
Blown SECURITY light
bulb
Malfunction of the ECU.
Damaged or disconnected
wiring of a door key cylin-
der and the liftgate unlock
switch input circuit.
Malfunction of a door key
cylinder and the liftgate un-
lock switch.
Malfunction of the ECU.
2.
ACTIVATION / DEACTIVATION RELATIONSHIP
Trouble symptom Cause
There is no alarm when, as an
Damaged or disconnected
alarm test, a door is opened with-
wiring of door switch (all
out using the key.
doors) input circuit
(The arming and disarming are
normal, and the alarm is acti-
Malfunction of the door
vated when the liftgate or hood is
switch
opened.)
Malfunction of the ECU
There is no alarm when, as an
Damaged or disconnected
alarm test, the liftgate is opened
without using the key.
wiring of liftgate switch in-
put circuit
(The alarm is activated, however,
by opening a door or the hood.)
Malfunction of the liftgate
switch.
Malfunction of the ECU.
Check method
Check by using check
chart P.54-224.
Check by using check
chart P.54-225.
Check by using check
chart P.54-229.
If input checks
(P.54-220) indicate a
malfunction, check by
using check chart
P&f-227.
Check method
If input checks
(P.54-220) indicate a
malfunction, check by
using check chart
P.54-225.
If input checks
(P.54-220) indicate a
malfunction, check by
using check chart
P.54-228.
Remedy
Replace the fusible link
No. (6) or the fuse No.
(19).
Repair the harness.
Repair the harness or re-
place the door switch.
Replace the fusible link
No. (6) or the fuse No.
(1%
Repair the harness.
Replace the bulb.
Replace the ECU.
Repair the harness or re-
place a door key cylinder
and the liftgate unlock
switch.
Replace the ECU.
Remedy
Repairthe harness or re-
place the door switch.
Replace the ECU.
Repair the harness or re-
place the liftgate switch.
Replace the ECU.
TSB Revision