2005 MITSUBISHI 380 key

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-388
STEP 10. Check the wiring harness between key reminder
switch connector C-310 (terminal 2) and battery.
NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-29 is damaged, repair or
replace the connector as described in GROUP 00E, Harness
Connector Inspection P.00E-2.
Q: Is the wiring harness between key reminder switch
connector C-310 (terminal 2) and battery in good
condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the ignition key hole illumination lamp illuminates
normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-389
STEP 11. Check the wiring harness between key reminder
switch connector C-310 (terminal 1) and ETACS-ECU
connector C-218 (terminal 63).
Q: Is the wiring harness between key reminder switch
connector C-310 (terminal 1) and ETACS-ECU connector
C-218 (terminal 63) in good condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the ignition key hole illumination lamp illuminates
normally.
INSPECTION PROCEDURE K-5: Interior Light: The interior lamp automatic shutoff function does not
work normally.
NOTE: This troubleshooting procedure requires the
use of diagnostic tool MB991958 and SWS monitor
kit MB991813. For details on how to use the SWS
monitor, refer to "How to connect SWS monitor
P.54B-13."
.
CIRCUIT OPERATION
The ETACS-ECU operates the interior lamp auto-
matic shutdown function according to the following
switch signals:
Ignition switch (ACC)
Ignition switch (IG1)
Front door switch (LH)
Door switches
interior lamp loaded signal
.
TECHNICAL DESCRIPTION (COMMENT)
If the function does not work normally, the input cir-
cuit system from the switches or the ETACS-ECU
may be defective (refer to "CIRCUIT OPERATION").
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
Trouble in input signal system
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
The ETACS-ECU may be defective

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-408
INSPECTION PROCEDURE M-2: ETACS-ECU does not receive any signal from the ignition switch
(IG1).
.
CIRCUIT OPERATION
The ETACS-ECU operates the following equipment
or functions according to signal from the ignition
switch (IG1):
Light reminder tone alarm function
Seat belt tone alarm function
Door ajar warning buzzer
Turn-signal lamp buzzer
Multi center display operation tone multi center display (middle grade type)>
Power window timer function
Sunroof timer function
Headlamp automatic shutdown function
Turn-signal lamp
Dome lamp dimming function
Ignition key hole illumination lamp
If the power supply circuit from the battery to the
ETACS-ECU is open, this circuit is used as
backup circuit.
If the signal is not normal, the equipment or functions
described in "CIRCUIT OPERATION" do not work
normally.
The ETACS-ECU receives information on the ignition
switch condition (IG1) from the combination meter
via CAN communication. If the ignition switch (IG1)
input signal is incorrect, refer to the Diagnostic Trou-
ble Code Chart P.54B-25.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
The ETACS-ECU may be defective
DIAGNOSIS
Required Special Tool:
MB991223: Harness Set
STEP 1. Check ETACS-ECU connector C-219 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-219 in good condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. If the functions described in "CIRCUIT
OPERATION" work normally, the input signal from the
ignition switch (IG1) should be normal.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-414
CIRCUIT OPERATION
The ETACS-ECU operates the following functions or
systems according to signal from the front door
switches:
Light reminder tone alarm function switch (RH)>
Door ajar warning buzzer
Forgotten key reminder
Power window timer function
Sunroof timer function
Keyless entry system
Timed locking mechanism
Headlamp automatic shutdown function door switch (RH)>
Dome lamp
Interior lamp automatic-shutdown function
Ignition key hole illumination lamp switch (RH)>
Door-ajar indicator lamp
.
TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the functions or systems
described in "CIRCUIT OPERATION" do not work
normally. If the signal is not normal, the front door
switches or the ETACS-ECU may be defective.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The front door switches may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
The ETACS-ECU may be defective

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-432
INSPECTION PROCEDURE N-1: ETACS-ECU does not receive any signal from the key reminder
switch.
.
CIRCUIT OPERATION
The ETACS-ECU operates the following functions or
systems according to signal from the key reminder
switch:
Forgotten key reminder
Keyless entry system
Timed locking mechanism
Dome lamp dimming function
Ignition key hole illumination lamp
.
TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the functions or systems
described in "CIRCUIT OPERATION" do not work
normally.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The key reminder switch may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
The ETACS-ECU may be defective
DIAGNOSIS
Required Special Tool:
MB991223: Harness Set
STEP 1. Check key reminder switch connector C-310 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is key reminder switch connector C-310 in good
condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. If the functions described in "CIRCUIT
OPERATION" work normally, the input signal from the
key reminder switch should be normal.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-433
STEP 2. Check the key reminder switch.
Disconnect key reminder switch connector C-310. Then check
continuity between terminals.
Q: Is the key reminder switch in good condition?
YES : Go to Step 3.
NO : Replace the key reminder switch. If the functions
described in "CIRCUIT OPERATION" work normally,
the input signal from the key reminder switch should
be normal.
STEP 3. Check the ground circuit to the key reminder
switch. Measure the resistance at key reminder switch
connector C-310.
(1) Disconnect key reminder switch connector C-310 and
measure the resistance available at the wiring harness side
of the connector.
(2) Measure the resistance value between terminal 4 and
ground.
The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 5.
NO : Go to Step 4. IGNITION KEY TESTER
CONNECTIONSPECIFIED
CONDITION
Removed 4
6 Open circuit
Inserted 4
6 Less than 2 ohms

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-434
STEP 4. Check the wiring harness between key reminder
switch connector C-310 (terminal 4) and ground.
Q: Is the wiring harness between key reminder switch
connector C-310 (terminal 4) and ground in good
condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. If the
functions described in "CIRCUIT OPERATION" work
normally, the input signal from the key reminder
switch should be normal.
STEP 5. Check ETACS-ECU connector C-217 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-217 in good condition?
YES : Go to Step 6.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. If the functions described in "CIRCUIT
OPERATION" work normally, the input signal from the
key reminder switch should be normal.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-435
STEP 6. Check the wiring harness between key reminder
switch connector C-310 (terminal 6) and ETACS-ECU
connector C-217 (terminal 30).
Q: Is the wiring harness between key reminder switch
connector C-310 (terminal 6) and ETACS-ECU connector
C-217 (terminal 30) in good condition?
YES : Go to Step 7.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. If the
functions described in "CIRCUIT OPERATION" work
normally, the input signal from the key reminder
switch should be normal.
STEP 7. Check for continuity between key reminder switch
connector C-310 terminal 4 and each of the other terminals
as well as terminal 6 and each of the other terminals.
(1) Disconnect key reminder switch connector C-310 and
measure the resistance available at the equipment side of
the connector.
(2) Check for continuity between key reminder switch
connector C-310 terminal 4 and each of the other terminals
as well as terminal 6 and each of the other terminals.
Q: Does continuity exist between the terminals?
NO : Replace the ETACS-ECU. If the functions described
in "CIRCUIT OPERATION" work normally, the input
signal from the key reminder switch should be normal.
YES : Replace the key reminder switch. If the functions
described in "CIRCUIT OPERATION" work normally,
the input signal from the key reminder switch should
be normal.