Mitsubishi Outlander GS45X. Manual - part 1137

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-127

STEP 4. Check part number of KOS-ECU.
Check the part number of WCM.

OK: 8637A305

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Replace KOS-ECU and register the ID codes. (Refer 

to 

P.42B-15

.)

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

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

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

to 

P.42B-15

.)

NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to use 

Troubleshooting/inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-128

TROUBLE SYMPTOM CHART

M1429604500934

SYMPTOM PROCEDURES

Inspection Procedure 1: Cannot communicate with KOS-ECU using the scan tool.

CAUTION

Before replacing the ECU, ensure that the com-
munication circuit is normal.

.

TECHNICAL DESCRIPTION (COMMENT)

If the scan tool cannot communicate with the 
KOS-ECU, the CAN bus lines may be defective. If 
the KOS-ECU does not work, the KOS-ECU or the 
power supply circuit may be defective.

.

TROUBLESHOOTING HINTS

• Malfunction of the power supply or ground of 

KOS-ECU

• Malfunction of CAN bus line

DIAGNOSIS

Required Special Tools:

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

Trouble symptom

Inspection 
procedure 
number

Reference 
page

Cannot communicate with KOS-ECU using the scan tool.

1

P.42B-128

Abnormality in KOS-ECU power supply and ground circuits.

2

P.42B-130

Keyless operation warning display does not disappear.

3

P.42B-132

IG knob will not turn (keyless operation is not recognized).

4

P.42B-134

The engine will not start with KOS (IG knob operates normally).

5

P.42B-139

No door will be locked or unlocked by operating a lock/unlock switch on any door. 6

P.42B-141

Driver's door lock/unlock switch does not work.

7

P.42B-145

Front passenger's door lock/unlock switch does not work.

8

P.42B-148

The lock switch and liftgate lock release handle of the liftgate lock release handle 
do not work.

9

P.42B-152

The lock switch of the liftgate lock release handle does not perform the locking 
operation.

10

P.42B-155

Liftgate lock release handle does not perform the unlocking operation.

11

P.42B-159

Keyless entry system does not work.

12

P.42B-162

KOS timer lock function does not work.

13

P.42B-168

The dome light, the turn-signal lights and horn do not operate through the 
answerback function.

14

P.42B-169

Outer tone alarm does not sound.

15

P.42B-173

The keyless operation key cannot be registered using scan tool.

16

P.42B-177

Engine does not start with emergency key.

17

P.42B-180

Power door locks with selective unlocking does not work.

18

P.42B-182

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-129

• 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, diagnose the CAN bus 
line.

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 the 

Scan Tool (M.U.T.-III) 

P.42B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

STEP 2. Check the power supply circuit and the ground 
circuit to KOS-ECU.
Refer to Inspection Procedure 3 "Abnormality in KOS-ECU 
power supply and ground circuits" 

P.42B-130

.

Q: Is the power supply circuit and the ground circuit to 

KOS-ECU in good condition ?
YES : Go to Step 3.
NO :  Repair the power supply circuit and the ground circuit 

to KOS-ECU.

STEP 3. Retest the system
Check if scan tool can communicate with KOS-ECU.
Q: Does the scan tool cannot with KOS-ECU?

YES : The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to use 

Troubleshooting/inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

NO :  Replace KOS-ECU and register the ID codes (Refer 

to 

P.42B-15

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-130

Inspection Procedure 2: Abnormality in KOS-ECU power supply and ground circuits.

CAUTION

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

.

TECHNICAL DESCRIPTION (COMMENT)

If the KOS-ECU does not work at all or if the 
KOS-ECU cannot communicate with the scan tool, 
the KOS-ECU power supply or the ground circuit 
may be defective.

.

ACA02760

IG1
RELAY

AB

POWER 
SUPPLY

KOS-ECU Power Supply Circuit

ETACS-ECU

KOS-ECU

AC702145

Connector: C-102

AB

AC701632AD

Connector: C-317