Mitsubishi Evolution X. Manual — part 581
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-231
STEP 2. Check KOS-ECU connector C-05 and trunk lid
opener switch connector F-09 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Are KOS-ECU connector C-05 and trunk lid opener
switch connector F-09 in good condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
. Check that the trunk lid opener switch works
normally.
STEP 3. Check the trunk lid opener switch.
(1) Remove the trunk lid opener switch. Refer to GROUP 42A,
Trunk Lid
(2) Check continuity when the trunk lid opener switch is
operated to "ON" or "OFF" position.
Q: Is the trunk lid opener switch normal?
YES : Go to Step 4.
NO : Replace the trunk lid opener switch.
Switch
position
Terminal
number
Specified
condition
ON (Push)
1
− 2
Continuity
exists (2
Ω or
less)
OFF (Release)
1
− 2
Open circuit
AC607401AB
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-232
STEP 4. Check the wiring harness between the KOS-ECU
connector C-05 (terminal No. 28) and trunk lid opener
switch connector F-09 (terminal No. 1), and between trunk
lid opener switch connector F-09 (terminal No. 2) and
ground for open circuit.
(1) Disconnect KOS-ECU connector C-05 and trunk lid opener
switch connector F-09, and check the wiring harness.
(2) Check the wiring harness between KOS-ECU connector
C-05 (terminal No.28) and trunk lid opener switch connector
F-09 (terminal No.1).
OK: Continuity exists (2
Ω or less)
(3) Check the wiring harness between trunk lid opener switch
connector F-09 (terminal No.2) and ground.
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between KOS-ECU connector C-05
(terminal No. 28) and trunk lid opener switch connector
F-09 (terminal No. 1), and between trunk lid opener
switch connector F-09 (terminal No. 2) and ground in
good condition?
YES : Go to Step 5.
NO (KOS-ECU connector C-05 terminal No.28
− trunk lid
opener switch connector F-09 terminal No.1.) : Repair
the wiring harness between KOS-ECU connector
C-05 (terminal No.28) and trunk lid opener switch
connector F-09 (terminal No.1).
NO (trunk lid opener switch connector F-09 terminal
No.2
− ground.) : Repair the wiring harness between trunk
lid opener switch connector F-09 (terminal No.2) and
ground.
AC709707GY
Harness side: F-09
Harness side: C-05
AC209731
Connector F-09
(harness side)
AC208731CJ
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-233
STEP 5. Check the wiring harness between the trunk lid
opener switch connector F-09 (terminal Nos. 1, 2) and the
ground for short circuit.
(1) Disconnect trunk lid opener switch connector F-09, and
check the wiring harness.
(2) Check the wiring harness between trunk lid opener switch
connector F-09 (terminal No. 1) and ground
OK: No continuity
(3) Check the wiring harness between trunk lid opener switch
connector F-09 (terminal No. 2) and ground
OK: No continuity
Q: Is the wiring harness between trunk lid opener switch
connector F-09 (terminal Nos. 1, 2) and the ground in
good condition?
YES : Go to Step 6.
NO (trunk lid opener switch connector F-09 terminal
No.1
− ground.) : Repair the wiring harness between trunk
lid opener switch connector F-09 (terminal No.1) and
ground.
NO (trunk lid opener switch connector F-09 terminal
No.2
− ground.) : Repair the wiring harness between trunk
lid opener switch connector F-09 (terminal No.2) and
the ground.
STEP 6. KOS communication test
Using scan tool (M.U.T.-III), perform the antenna communica-
tion test to check that the exterior transmitter antenna (trunk lid
side) is normal (Refer to
Q: Is the check result normal?
YES : Go to Step 7.
NO : Perform troubleshooting for the diagnostic trouble
code No. B240C (Refer to
).
STEP 7. Check of the troubles
Operate the trunk lid opener switch to check that the trunk lid
can be opened.
Q: Is the check result normal?
YES : The diagnosis is complete.
NO : Replace KOS-ECU and register the ID codes (Refer
to
AC209731
AC208731CR
Harness side: F-09
AC209731
AC208731CS
Harness side: F-09
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-234
Inspection Procedure 14: Keyless entry system does not work.
CAUTION
Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the com-
munication circuit are normal.
AC709247
JOINT
CONNECTOR (6)
RECEIVER
KEYLESS
OPERATION
KEY
KOS-ECU
KOS-ECU System Input Signal
RECEIVER
ANTENNA
ASSEMBLY
AB
RED
RED
GREEN -RED
GREEN -RED
YELLOW
-GREEN
YELLOW
-GRAY
YELLOW
-GRAY
BROWN -WHITE
BROWN -WHITE
RED- WHITE
RED- WHITE
RED
GREEN -RED
BROWN -WHITE
RED- WHITE
AC708950AX
C-41
Connectors: C-05, C-41
C-05
AC708951AW
Connector: C-16
C-16 (B)
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