Mitsubishi Evolution X. Manual - part 579

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-223

Inspection Procedure 12: Front passenger's door unlock sensor does not work.

CAUTION

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

AC709310

UNLOCK SENSOR
(FRONT DOOR: RH)

JOINT
CONNECTOR 
(1)

BLA

CK

BLA

CK

BLA

CK

BLA

CK

WHITE

WHITE

LIGHT  GREEN

LIGHT  GREEN

LIGHT  GREEN

KOS-ECU

 Unlock Sensor (Front Door: RH) Circuit

AB

AC708950AY

Connectors: C-05, C-101

C-05

C-101 (B)

AC708951AX

C-116

C-117 (BR)

Connectors: C-116, C-117

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-224

.

TROUBLESHOOTING HINTS

• Malfunction of the exterior transmitter antenna 

assembly (front passenger's side)

• Malfunction of the unlock 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

STEP 1. Using scan tool MB991958, read the diagnostic 
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.42B-10

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the KOS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the KOS-ECU. Refer to 

P.42B-20

.

NO :  Go to Step 2.

AC608168 AD

Connector: E-05

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-225

STEP 2. Check KOS-ECU connector C-05 and unlock 
sensor (front door: RH) connector E-05 for loose, corroded 
or damaged terminals, or terminals pushed back in the 
connector.
Q: Are KOS-ECU connector C-05 and unlock sensor (front 

door: RH) connector E-05 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

. Check that the passenger’s door unlock 

sensor works normally.

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-226

STEP 3. Check the wiring harness between the KOS-ECU 
connector C-05 (terminal Nos. 25, 36) and unlock sensor 
(front door: RH) connector E-05 (terminal Nos. 4, 2), and 
between unlock sensor (front door: RH) connector E-05 
(terminal No. 6) and ground for open circuit.
(1) Disconnect KOS-ECU connector C-05 and unlock sensor 

(front door: RH) connector E-05, and check the wiring 
harness.

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

C-05 (terminal No.25) and unlock sensor (front door: RH) 
connector E-05 (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: RH) 
connector E-05 (terminal No.2).

OK: Continuity exists (2 

Ω or less)

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

door: RH) connector E-05 (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. 25, 36) and unlock sensor (front door: 
RH) connector E-05 (terminal Nos. 4, 2), and between 
unlock sensor (front door: RH) connector E-05 (terminal 
No. 6) and ground in good condition?
YES  : Go to Step 4.
NO (KOS-ECU connector C-05 terminal No.25 

− unlock 

sensor (front door: RH) connector E-05 terminal No.4.) : 

Repair the wiring harness between KOS-ECU 
connector C-05 (terminal No.25) and unlock sensor 
(front door: RH) connector E-05 (terminal No.4).

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

− unlock 

sensor (front door: RH) connector E-05 terminal No.2.) : 

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

NO (unlock sensor (front door: RH) connector E-05 
terminal No.6 

− ground.) : Repair the wiring harness 

between unlock sensor (front door: RH) connector 
E-05 (terminal No.6) and ground.

AC709707

Harness side: C-05

GN

Harness side: E-05

AC709707GO

Harness side: C-05

Harness side: E-05

AC209731

AC208731CI

Connector E-05 
(harness side)