air condition MITSUBISHI 380 2005 Workshop Manual

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-416
STEP 3. Check the front door switch (LH).
Remove the front door switch (RH). Refer to GROUP 42, Door,
Door Assembly P.42-37. Then check continuity between the
switch terminals and the body ground.
Q: Is the front door switch (LH) in good condition?
YES : Go to Step 4.
NO : Replace the front door switch (RH). If the functions
described in "CIRCUIT OPERATION" work normally,
the input signal from the front door switch (RH) should
be normal.
STEP 4. Measure resistance at the lower metal part of the
front door switch (RH) in order to check the ground circuit
to the front door switch (RH).
NOTE: Check that the front door switch (RH) is grounded to the
vehicle body via its mounting screw.
Remove the cap, and measure the resistance value between
the lower metal part 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 : Check the installation of the switch, and repair if
necessary. If the functions described in "CIRCUIT
OPERATION" work normally, the input signal from the
front door switch (RH) should be normal.
STEP 5. 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 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
front door switch (LH) should be normal. SWITCH
POSITIONTESTER
CONNECTIONSPECIFIED
CONDITION
Released (ON) 1
body ground Less than 2 ohms
Pressed (OFF) 1
body ground Open circuit

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-417
STEP 6. Check the wiring harness between front door
switch (RH) connector D-34 (terminal 1) and ETACS-ECU
connector C-219 (terminal 10).
NOTE: Also check junction block connector C-204 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector C-204 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector Inspection P.00E-2.
Q: Is the wiring harness between front door switch (RH)
connector D-34 (terminal 1) and ETACS-ECU connector
C-219 (terminal 10) in good condition?
YES : Replace the ETACS-ECU. If the functions described
in "CIRCUIT OPERATION" work normally, the input
signal from the front door switch (RH) 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
functions described in "CIRCUIT OPERATION" work
normally, the input signal from the front door switch
(RH) should be normal.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-418
STEP 7. Check front door switch (LH) connector D-22 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is front door switch (LH) connector D-22 in good
condition?
YES : Go to Step 8.
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
front door switch (LH) should be normal.
STEP 8. Check the front door switch (RH).
Remove the front door switch (LH). Refer to GROUP 42, Door,
Door Assembly P.42-37. Then check continuity between the
switch terminals and the body ground.
Q: Is the front door switch (LH) in good condition?
YES : Go to Step 9.
NO : Replace the front door switch (LH). If the functions
described in "CIRCUIT OPERATION" work normally,
the input signal from the front door switch (LH) should
be normal.
STEP 9. Measure resistance at the lower metal part of the
front door switch (LH) in order to check the ground circuit
to the front door switch (LH).
NOTE: Check that the front door switch (LH) is grounded to the
vehicle body via its mounting screw.
Remove the cap, and measure the resistance value between
the lower metal part and ground.
The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 10.
NO : Check the installation of the switch, and repair if
necessary. If the functions described in "CIRCUIT
OPERATION" work normally, the input signal from the
front door switch (LH) should be normal.
SWITCH
POSITIONTESTER
CONNECTIONSPECIFIED
CONDITION
Released (ON) 1
body ground Less than 2 ohms
Pressed (OFF) 1
body ground Open circuit

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-419
STEP 10. 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 11.
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
front door switch (LH) should be normal.
STEP 11. Check the wiring harness between front door
switch (LH) connector D-22 (terminal 1) and ETACS-ECU
connector C-218 (terminal 59).
Q: Is the wiring harness between front door switch (LH)
connector D-22 (terminal 1) and ETACS-ECU connector
C-218 (terminal 59) in good condition?
YES : Replace the ETACS-ECU. If the functions described
in "CIRCUIT OPERATION" work normally, the input
signal from the front door switch (LH) 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
functions described in "CIRCUIT OPERATION" work
normally, the input signal from the front door switch
(LH) should be normal.

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-426
INSPECTION PROCEDURE M-7: Column Switch: ETACS-ECU does not receive any signal from the
variable intermittent wiper control switch.
.
CIRCUIT OPERATION
The ETACS-ECU calculates the windshield intermit-
tent wiper interval according to the position of the
variable intermittent wiper control switch, which is
incorporated in column switch (windshield wiper and
washer switch).
.
TECHNICAL DESCRIPTION (COMMENT)
If the windshield intermittent wiper interval cannot be
adjusted, the column switch or the ETACS-ECU may
be defective.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The column switch may be defective (windshield
wiper and washer switch)
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 column switch connector C-309 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is column switch connector C-309 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 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-427
STEP 2. Check the variable intermittent wiper control
switch.
(1) Remove the windshield wiper and washer switch, and
check at the switch side.
(2) Measure the resistance value between terminals 27 and 28.
The measured resistance should change smoothly from
approximately 0 ohm ("FAST" position) to 1 k
("SLOW"
position).
Q: Is the variable intermittent wiper control switch in good
condition?
YES : Go to Step 3.
NO : Replace the column switch (windshield wiper and
washer switch). If the wiper interval can be adjusted
normally, that the variable intermittent wiper control
switch should send a signal to the ECU.
STEP 3. 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 4.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. If the wiper interval can be adjusted
normally, that the variable intermittent wiper control
switch should send a signal to the ECU.

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-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.