ECU MITSUBISHI 380 2005 Workshop Manual

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-428
STEP 4. Check the wiring harness between column switch
connector C-309 (terminal 6) and ETACS-ECU connector
C-218 (terminal 60).
Q: Is the wiring harness between column switch connector
C-309 (terminal 6) and ETACS-ECU connector C-218
(terminal 60) in good condition?
YES : Go to Step 5.
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 wiper
interval can be adjusted normally, the variable
intermittent wiper control switch should send a signal
to the ECU.
STEP 5. Replace the column switch.
(1) Replace the column switch.
(2) If the wiper interval can be adjusted normally, the variable
intermittent wiper control switch should send a signal to the
ECU.
Q: Can input signal be confirmed when the variable
intermittent wiper control switch is operated?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. If the wiper interval can be
adjusted normally, the variable intermittent wiper
control switch should send a signal to the ECU.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-429
INSPECTION PROCEDURE M-8: Sunroof Switch: ETACS-ECU does not receive any signal from the
up, open or close/down switch.
.
CIRCUIT OPERATION
The ETACS-ECU receives a signal through the sun-
roof motor assembly via the SWS communication
line from the sunroof switch, and sends a signal to
the data link connector.
.
TECHNICAL DESCRIPTION (COMMENT)
If the SWS communication line between the sunroof
motor assembly and the ETACS-ECU is defective,
the ETACS-ECU cannot identify the input signal from
the sunroof switch even if the sunroof is normal.
.
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 sunroof motor assembly may be defective
The ETACS-ECU may be defective

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-430
DIAGNOSIS
Required Special Tool:
MB991223: Test Harness Set
STEP 1. Check the sunroof operation.
Q: Does the sunroof work normally?
YES : Go to Step 2.
NO : Refer to Inspection Procedure F-1 "Sunroof does not
operate P.54B-210."
STEP 2. Check sunroof motor assembly connector D-04
and ETACS-ECU connector C-218 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are sunroof motor assembly connector D-04 and
ETACS-ECU connector C-218 in good condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. If the sunroof operates normally, a correct
signal is sent from the sunroof switch.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-431
STEP 3. Check the wiring harness between sunroof motor
assembly connector D-04 (terminal 10) and ETACS-ECU
connector C-218 (terminal 53).
NOTE: Also check intermediate connector C-27. If intermediate
connector C-27 is damaged, repair or replace the connector as
described in GROUP 00E, Harness Connector Inspection
P.00E-2.
Q: Is the wiring harness between sunroof motor assembly
connector D-04 (terminal 10) and ETACS-ECU connector
C-218 (terminal 53) in good condition?
YES : Go to Step 4.
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 sunroof
operates normally, a correct signal is sent from the
sunroof switch.
STEP 4. Replace the sunroof motor assembly.
(1) Replace the sunroof motor assembly.
(2) If the sunroof operates normally, a correct signal is sent
from the sunroof switch.
Q: Does the ETACS-ECU receive correct signals from the
sunroof switch?
YES : No action is necessary and testing is complete.
NO : Replace the ETACS-ECU. If the sunroof operates
normally, a correct signal is sent from the sunroof
switch.

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-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.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-436
INSPECTION PROCEDURE N-2: ETACS-ECU does not receive any signal from the hazard warning
lamp switch.
.
CIRCUIT OPERATION
The ETACS-ECU operates the following functions or
systems according to signal from the hazard warning
lamp switch:
Turn-signal lamp buzzer
Hazard warning lamp
Keyless entry system (registering the encrypted
code)
.
TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the equipment 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 hazard warning lamp switch may be defec-
tive
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 hazard warning lamp switch connector
C-08 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is hazard warning lamp switch connector C-08 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 equipment described in "CIRCUIT
OPERATION" work normally, the input signal from the
hazard warning lamp switch should be normal.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-438
STEP 4. Check the wiring harness between hazard warning
lamp switch connector C-08 (terminal 2) and ground.
Q: Is the wiring harness between hazard warning lamp
switch connector C-08 (terminal 2) 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
equipment described in "CIRCUIT OPERATION" work
normally, the input signal from the hazard warning
lamp switch should be normal.
STEP 5. Check ETACS-ECU connector C-218 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-218 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 equipment described in "CIRCUIT
OPERATION" work normally, the input signal from the
hazard warning lamp switch should be normal.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-439
STEP 6. Check the wiring harness between hazard warning
lamp switch connector C-08 (terminal 1) and ETACS-ECU
connector C-218 (terminal 49).
Q: Is the wiring harness between hazard warning lamp
switch connector C-08 (terminal 1) and ETACS-ECU
connector C-218 (terminal 49) in good condition?
YES : Replace the ETACS-ECU. If the equipment described
in "CIRCUIT OPERATION" work normally, the input
signal from the hazard warning lamp switch should be
normal.
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
equipment described in "CIRCUIT OPERATION" work
normally, the input signal from the hazard warning
lamp switch should be normal.