Mitsubishi Eclipse 1990 Service Manual page 1869

If the driver's side inside lock knob is locked under the following conditions, the door can not
locked:
The key is removed from the ignition key cylinder.
The driver's side door is opened.
OK
between
OK
Check trouble symptom.
N G
Replace the ETACS-ECU
BODY
and
minder switch and the ETACS-ECU.
Replace the ETACS-ECU.
NG
Check the
and
(4)
TSB Revision
Door
connectors: