Mitsubishi Evolution X. Manual — part 552

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-115

STEP 4. Check the wiring harness between the unlock
sensor (front door: LH) connector E-18 (terminal Nos. 4, 2)
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

Q: Is the wiring harness between unlock sensor (front

door: LH) connector E-18 (terminal Nos. 4, 2) 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.

AC709707IR

Harness side: E-18

AC709707IS

Harness side: E-18

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-116

STEP 5. 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) 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)

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) in good
condition?
YES : Go to Step 6.
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).

AC709707

Harness side: C-05

GN

Harness side: E-05

AC709707GO

Harness side: C-05

Harness side: E-05

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-117

STEP 6. Check the wiring harness between the unlock
sensor (front door: RH) connector E-05 (terminal Nos. 4, 2)
and the ground for short circuit.
(1) Disconnect unlock sensor (front door: RH) connector E-05,

and check the wiring harness.

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

door: RH) connector E-05 (terminal No. 4) and ground

OK: No continuity

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

door: RH) connector E-05 (terminal No. 2) and ground

OK: No continuity

Q: Is the wiring harness between unlock sensor (front

door: RH) connector E-05 (terminal Nos. 4, 2) and the
ground in good condition?
YES : Go to Step 7.
NO [unlock sensor (front door: RH) connector E-05
terminal No.4

− ground.] : Repair the wiring harness

between unlock sensor (front door: RH) connector
E-05 (terminal No.4) and ground.

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

− ground.] : Repair the wiring harness

between unlock sensor ((front door: RH) connector
E-05 (terminal No.2) and the ground.

STEP 7. Replace the unlock sensor, and check whether the
diagnostic trouble code is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the LOCK (OFF) position to the

ON position.

(3) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace KOS-ECU and register the ID codes (Refer

to

P.42B-12

).

NO : The procedure is complete.

AC709707IT

Harness side: E-05

AC709707IU

Harness side: E-05

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-118

DTC B2415: RA module power voltage

CAUTION

• If DTC B2415 is set, diagnose the CAN bus

lines.

• When replacing the ECU, always check that

the communication circuit is normal.

Receiver Antenna Module and KOS-ECU Circuit

KOS-ECU

IMMOBILIZER
ANTENNA

RECEIVER

RECEIVER ANTENNA
ASSEMBLY

RECEIVER ANTENNA
MODULE

JOINT
CONNECTOR (6)

AC708950AX

C-41

Connectors: C-05, C-41

C-05

AC708951CG

Connectors: C-08, C-16

C-16 (B)

C-08