Mitsubishi Outlander GS45X. Manual - part 1125

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-79

.

DIAGNOSTIC FUNCTION

If an open circuit is detected in the inside transmis-
sion antenna assembly (front), the diagnostic trouble 
code is set.

.

JUDGMENT CRITERIA

When the ignition push switch is pressed, or when 
the antenna open circuit detection request is 
received from the diagnosis function, the failure is 
detected.

.

PROBABLE CAUSES

• Malfunction of the inside transmission antenna 

assembly (front)

• Malfunction of the KOS-ECU

• Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Check KOS-ECU connector C-102 and inside 
transmission antenna assembly (front) connector D-124 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are KOS-ECU connector C-102 and inside transmission 

antenna assembly (front) connector D-124 in good 
condition?
YES : Go to Step 2.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 2. Check the wiring harness between KOS-ECU 
connector C-102 (terminal Nos. 6, 16 and 40) and inside 
transmission antenna assembly (front) connector D-124 
(terminal Nos. 3, 2 and 1). 

• Check the communication, power supply, and ground wires 

for open circuit.

NOTE: Also check intermediate connector C-22 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connectors C-22 is damaged, repair 
or replace the damaged component(s) as described in GROUP 
00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between KOS-ECU connector 

C-102 (terminal Nos. 6, 18 and 40) and inside 
transmission antenna assembly (front) connector D-124 
(terminal Nos. 3, 2 and 1) in good condition?
YES : Go to Step 3.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary.

AC901079

Connector: D-124

AV

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-80

STEP 3. Keyless operation system communication test
Check that the communication with the inside transmission 
antenna assembly (front) is normal (Refer to Antenna Test 

P.42B-197

).

Antennas to be checked
Driver's side antenna (interior)

OK: Normal is displayed.

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Replace the inside transmission antenna assembly 

(front).

STEP 4. Check whether the diagnostic trouble code is 
reset.
(1) Erase the diagnostic trouble code.
(2) Turn the ignition switch from the LOCK (OFF) position to the 

ON position.

(3) Check if the diagnostic trouble code is set.
Q: Is the diagnostic trouble code set?

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

to 

P.42B-188

).

NO :  Intermittent malfunction is suspected (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-81

DTC B240E RR antenna(indoor) open

CAUTION

When replacing the ECU, always check that the 
communication circuit is normal.

AC609424

KOS-ECU

KEYLESS 
OPERATION 
KEY

SKY  BLUE

SKY  BLUE

SKY  BLUE

RED- BLA

CK

BLA

CK

-WHITE

BLA

CK

-WHITE

RED- BLA

CK

RED- BLA

CK

 Inside Transmission Antenna assembly (Rear: Passenger's Side) Circuit

AH

INSIDE TRANSMISSION 

ANTENNA ASSEMBLY 

(REAR: PASSENGER'S SIDE)

AC901076AG

Connector: C-22

AC901075AG

Connector: C-102

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-82

.

DIAGNOSTIC FUNCTION

If an open circuit is detected in the inside transmis-
sion antenna assembly (rear: passenger's side), the 
diagnostic trouble code is set.

.

JUDGMENT CRITERIA

When the ignition push switch is pressed, or when 
the antenna open circuit detection request is 
received from the diagnosis function, the failure is 
detected.

.

PROBABLE CAUSES

• Malfunction of inside transmission antenna 

assembly (rear: passenger's side)

• Malfunction of the KOS-ECU

• Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Check KOS-ECU connector C-102 and inside 
transmission antenna assembly (rear: passenger’s side) 
connector D-106 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Are KOS-ECU connector C-102 and inside transmission 

antenna assembly (rear: passenger’s side) connector 
D-106 in good condition?
YES : Go to Step 2.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 2. Check the wiring harness between KOS-ECU 
connector C-102 (terminal Nos. 6, 20 and 40) and inside 
transmission antenna assembly (rear: passenger’s side) 
connector D-106 (terminal Nos. 3, 2 and 1). 

• Check the communication, power supply, and ground wires 

for open circuit.

NOTE: Also check intermediate connector C-22 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connectors C-22 is damaged, repair 
or replace the damaged component(s) as described in GROUP 
00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between KOS-ECU connector 

C-102 (terminal Nos. 6, 20 and 40) and inside 
transmission antenna assembly (rear: passenger’s side) 
connector D-106 (terminal Nos. 3, 2 and 1) in good 
condition?
YES : Go to Step 3.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary.

AC901080AK

Connector: D-106