Mitsubishi Evolution X. Manual — part 577

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-215

STEP 3. Check the wiring harness between the KOS-ECU
connector C-05 (terminal Nos. 24, 36) and unlock sensor
(front door: LH) connector E-18 (terminal Nos. 4, 2), and
between unlock sensor (front door: LH) connector E-18
(terminal No. 6) and ground for open circuit.
(1) Disconnect KOS-ECU connector C-05 and unlock sensor

(front door: LH) connector E-18, and check the wiring
harness.

(2) Check the wiring harness between KOS-ECU connector

C-05 (terminal No.24) and unlock sensor (front door: LH)
connector E-18 (terminal No.4).

OK: Continuity exists (2

Ω or less)

(3) Check the wiring harness between KOS-ECU connector

C-05 (terminal No.36) and unlock sensor (front door: LH)
connector E-18 (terminal No.2).

OK: Continuity exists (2

Ω or less)

(4) Check the wiring harness between unlock sensor (front

door: LH) connector E-18 (terminal No.6) and ground.

OK: Continuity exists (2

Ω or less)

Q: Is the wiring harness between KOS-ECU connector C-05

(terminal Nos. 24, 36) and unlock sensor (front door:
LH) connector E-18 (terminal Nos. 4, 2), and between
unlock sensor (front door: LH) connector E-18 (terminal
No. 6) and ground in good condition?
YES : Go to Step 4.
NO (KOS-ECU connector C-05 terminal No.24

− unlock

sensor (front door: LH) connector E-18 terminal No.4.) :

Repair the wiring harness between KOS-ECU
connector C-05 (terminal No.24) and unlock sensor
(front door: LH) connector E-18 (terminal No.4).

NO (KOS-ECU connector C-05 terminal No.36

− unlock

sensor (front door: LH) connector E-18 terminal No.2.) :

Repair the wiring harness between KOS-ECU
connector C-05 (terminal No.36) and unlock sensor
(front door: LH) connector E-18 (terminal No.2).

NO (unlock sensor (front door: LH) connector E-18
terminal No.6

− ground.) : Repair the wiring harness

between unlock sensor (front door: LH) connector
E-18 (terminal No.6) and ground.

AC709707

Harness side: C-05

GK

Harness side: E-18

AC709707GL

Harness side: C-05

Harness side: E-18

AC209731

Connector E-18
(harness side)

AC208731CG

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-216

STEP 4. Check the wiring harness between the unlock
sensor (front door: LH) connector E-18 (terminal Nos. 4, 2,
6) and the ground for short circuit.
(1) Disconnect unlock sensor (front door: LH) connector E-18,

and check the wiring harness.

(2) Check the wiring harness between unlock sensor (front

door: LH) connector E-18 (terminal No. 4) and ground

OK: No continuity

(3) Check the wiring harness between unlock sensor (front

door: LH) connector E-18 (terminal No. 2) and ground

OK: No continuity

(4) Check the wiring harness between unlock sensor (front

door: LH) connector E-18 (terminal No.6) and ground.

OK: No continuity

Q: Is the wiring harness between unlock sensor (front

door: LH) connector E-18 (terminal Nos. 4, 2, 6) and the
ground in good condition?
YES : Go to Step 5.
NO [unlock sensor (front door: LH) connector E-18
terminal No.4

− ground.] : Repair the wiring harness

between unlock sensor (front door: LH) connector
E-18 (terminal No.4) and ground.

NO [unlock sensor (front door: LH) connector E-18
terminal No.2

− ground.] : Repair the wiring harness

between unlock sensor (front door: LH) connector
E-18 (terminal No.2) and the ground.

NO [unlock sensor (front door: LH) connector E-18
terminal No.6

− ground.] : Repair the wiring harness

between unlock sensor (front door: LH) connector
E-18 (terminal No.6) and the ground.

AC709707IR

Harness side: E-18

AC709707IS

Harness side: E-18

AC209731

AC208731CN

Harness side: E-18

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-217

STEP 5. KOS communication test
Using scan tool (M.U.T-III), perform the antenna communica-
tion test to check that the exterior transmitter antenna (driver's
side) communicates normally (Refer to

P.42B-265

).

Q: Is the check result normal?

YES : Go to Step 6.
NO : Perform troubleshooting for the diagnostic trouble

code No. B240A (Refer to

P.42B-72

).

STEP 6. Check of the troubles
Operate the unlock sensor (front door: LH) and check that the
door can be locked.
Q: Is the check result normal?

YES : The diagnosis is complete.
NO : Replace KOS-ECU and register the ID codes (Refer

to

P.42B-12

).

Inspection Procedure 11: Front passenger's door lock switch does not work.

CAUTION

Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the com-
munication circuit are normal.

AC709309

KOS-ECU

LOCK SWITCH
(FRONT DOOR: RH)

BLA

CK

BLA

CK

BLA

CK

BLA

CK

ORANGE

YELLO

W

-BLUE

Lock Switch (Front Door: RH) Circuit

AB

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-218

.

TROUBLESHOOTING HINTS

• Malfunction of the exterior transmitter antenna

assembly (front passenger's side)

• Malfunction of the lock switch (front door: RH)

• Damaged wiring harness and connectors

• Malfunction of the KOS-ECU

DIAGNOSIS

Required Special Tools:

• MB992006: Extra fine probe

• MB991223: Harness set

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

AC708950AZ

Connector: C-05

AC708951AX

C-116

C-117 (BR)

Connectors: C-116, C-117

AC608168 AC

Connector: E-06

E-06 (GR)