Mitsubishi Evolution X. Manual — part 587

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-255

Inspection Procedure 18: Outer tone alarm does not sound.

CAUTION

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

.

TECHNICAL DESCRIPTION (COMMENT)

The outer tone alarm sounds under the following
conditions.

• When the door is locked or unlocked with the

keyless or keyless operation function

• Door lock does not operate.

• The keyless operation key is brought out of the

vehicle.

.

AC609041

KOS-ECU

OUTER BUZZER

Outer Buzzer Circuit

AC

YELLO

W

-RED

WHITE -BLUE

YELLO

W

-RED

WHITE -BLUE

WHITE -BLUE

YELLO

W

-RED

AC708950AW

C-42

Connectors: C-05, C-42

C-05

AC708955AL

Connector: D-17

D-17 (BR)

AC708970AF

Connector: F-21

F-21 (GR)

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-256

TROUBLESHOOTING HINTS

• Malfunction of the antenna and outer tone alarm

assembly

• Malfunction of the KOS-ECU

• Damaged wiring harness and connectors

DIAGNOSIS

STEP 1. Check the customize function.
Check that either of the followings other than "Not sound tone
alarm" is set for "Tone alarm answer back" with the customiza-
tion function.

• At keyless

• At F.A.S.T.

• At Both

Q: Is the check result normal?

YES : Go to Step 2.
NO : Set either of the followings other than "Tone alarm

answer back" with the customization function (Refer
to

P.42B-276

).

STEP 2. 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 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-257

STEP 3. Using scan tool MB991958, read the actuator test.

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 that the outer tone alarm sounds (Refer to

P.42B-171

).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Go to Step 6.
NO : Go to Step 4.

STEP 4. Check KOS-ECU connector C-05 and outer tone
alarm connector F-21 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are KOS-ECU connector C-05 and outer tone alarm

connector F-21 in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Check that the outer tone alarm works

normally.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-258

STEP 5. Check the wiring harness between the KOS-ECU
connector C-05 (terminal Nos. 35, 37) and outer tone alarm
connector F-21 (terminal Nos. 1, 2) for open circuit.
(1) Disconnect KOS-ECU connector C-05 and outer tone alarm

connector F-21, and check the wiring harness.

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

C-05 (terminal No.35) and outer tone alarm connector F-21
(terminal No.1).

OK: Continuity exists (2

Ω or less)

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

C-05 (terminal No.37) and outer tone alarm connector F-21
(terminal No.2).

OK: Continuity exists (2

Ω or less)

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

(terminal Nos. 35, 37) and outer tone alarm connector
F-21 (terminal Nos. 1, 2) in good condition?
YES : Go to Step 6.
NO (KOS-ECU connector C-05 terminal No.35

− outer

tone alarm connector F-21 terminal No.1.) : Repair the

wiring harness between KOS-ECU connector C-05
(terminal No.35) and outer tone alarm connector F-21
(terminal No.1).

NO (KOS-ECU connector C-05 terminal No.37

− outer

tone alarm connector F-21 terminal No.2.) : Repair the

wiring harness between KOS-ECU connector C-05
(terminal No.37) and outer tone alarm connector F-21
(terminal No.2).

AC709707 HQ

Harness side: C-05

Harness side: F-21

AC709707 HR

Harness side: C-05

Harness side: F-21