Mitsubishi Evolution X. Manual - part 584

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-243

NO (receiver antenna assembly connector D-14 terminal 
No.1 

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14 (terminal 
No.1) and the ground.

NO (receiver antenna assembly connector D-14 terminal 
No.5 

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14 (terminal 
No.5) and the ground.

STEP 7. Check with another registered keyless operation 
key.
Check that the keyless entry function can be used with another 
keyless operation key.
Q: Can the keyless entry function be used?

YES : Replace the keyless operation key concerned and 

register the ID codes (Refer to 

P.42B-12

).

NO :  Go to Step 8.

STEP 8. Check of the troubles
Replace receiver antenna assembly. After the replacement, 
perform the coding, and check that the keyless entry system 
operates normally.
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 15: KOS timer lock function does not work.

CAUTION

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

.

TECHNICAL DESCRIPTION (COMMENT)

After the door is unlocked with the keyless entry 
function, if no operation is performed, the door is 
locked when the time specified by a customization 
function has elapsed. However, an open signal from 
any door, key reminder switch OFF (with the key 
inserted) signal, or ignition push switch ON signal 
has been input to ETACS, the KOS timer will not 
operate.

.

TROUBLESHOOTING HINTS

• Malfunction of ETACS-ECU

• Malfunction of the door switches

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-244

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. Check the operation of the keyless operation 
system (keyless entry system).
Operate the keyless operation key and check that all doors lock 
and unlock.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Refer to inspection procedure 14: "Keyless entry 

system does not work 

P.42B-234

."

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

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-245

STEP 3. Check of the troubles
Check that the KOS timer lock function operates.
Q: Is the check result normal?

YES : The diagnosis is complete.
NO :  Perform troubleshooting for each door switch (Refer 

to GROUP 54A 

− ETACS − Troubleshooting 

P.54A-639

).

Inspection Procedure 16: Keyless entry hazard light answerback function, the dome light answerback 
function or the horn answerback function does not work normally.

CAUTION

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

.

TECHNICAL DESCRIPTION (COMMENT)

When the keyless entry function is used, the keyless 
entry hazard answerback function, dome light 
answerback function or horn answerback function 
operate as set by ETACS customization function (If 
the flashing count is set to 0 with a customization 
function, no answerback function is performed).

.

TROUBLESHOOTING HINTS

• Function setting error or no setting with a custom-

ization

• Malfunction of the turn signal lights

• Malfunction of the dome light

• Malfunction of the horn

• Malfunction of ETACS-ECU

DIAGNOSIS

STEP 1. Verify the operation hazard warning light
Check that the hazard warning light illuminate normally.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Refer to GROUP 54A 

− inspection procedure 1: 

"Hazard warning light does not illuminate 

P.54A-266

."

STEP 2. Verify the operation of the dome light.
Check that the dome lights illuminate normally.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Refer to GROUP 54A 

− inspection procedure 1 "The 

front dome light does not illuminate normally 

P.54A-243

." or inspection procedure 2 "The rear 

dome light does not illuminate normally 

P.54A-248

."

STEP 3. Verify the horn.
Check that the horn normally.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Replace the horn (Refer to GROUP 54A, Horn 

P.54A-268

).

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-246

STEP 4. Check the operation of the keyless entry system.
Operate the keyless operation key and check that all doors lock 
and unlock.
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Refer to inspection procedure 14: "Keyless entry 

system does not work 

P.42B-234

."

STEP 5. Check the customize function.
Check that any one of the followings other than "Lock: 0, 
Unlock: 0" is set for "Hazard answerback" with a customization 
function.

• Lock:1, Unlock:2

• Lock:1, Unlock:0

• Lock:0, Unlock:2

• Lock:2, Unlock:1

• Lock:2, Unlock:0

• Lock:0, Unlock:1

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Set "Hazard answerback" to any one other than 

"Lock: 0, Unlock: 0" with a customization function 
(Refer to 

P.42C-126

).

STEP 6. Check the customize function.
Check that any one of the followings other than "Not sound 
horn" is set for "Horn chirp by keyless entry system <vehicles 
without auto light>" or "Horn chirp by keyless entry system 
<vehicles with auto light>" with a customization function.

<Vehicles without auto light>

• Lock any time

• W lock any time

<Vehicles with auto light>

• Lock any time

• Lock/auto ON

• W lock any time

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Set "Horn chirp by keyless entry system <vehicles 

without auto light>" or "Horn chirp by keyless entry 
system <vehicles with auto light>" to any one other 
than "Not sound horn" with a customization function 
(Refer to 

P.42C-126

).