Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMITSUBISHI2012LANCER RALLIARTREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSKEYLESS OPERATION SYSTEM (KOS) - LANCERDIAGNOSISTROUBLE SYMPTOM CHART

2012 Mitsubishi Lancer Ralliart

Trouble Symptom Chart

2012 Mitsubishi Lancer RalliartSECTION Trouble Symptom Chart

TROUBLE SYMPTOM CHART

Trouble symptom	Inspection procedure
Cannot communicate with KOS-ECU using the scan tool.	Refer to INSPECTION PROCEDURE 1: CANNOT COMMUNICATE WITH KOS-ECU USING THE SCAN TOOL.
The keyless operation key cannot be registered using scan tool.	Refer to INSPECTION PROCEDURE 2: THE KEYLESS OPERATION KEY CANNOT BE REGISTERED USING SCAN TOOL.
Abnormality in KOS-ECU power supply and ground circuits.	Refer to INSPECTION PROCEDURE 3: ABNORMALITY IN KOS-ECU POWER SUPPLY AND GROUND CIRCUITS.
Keyless operation warning display does not disappear.	Refer to INSPECTION PROCEDURE 4: KEYLESS OPERATION WARNING DISPLAY DOES NOT DISAPPEAR.
IG knob will not turn (keyless operation is not recognized).	Refer to INSPECTION PROCEDURE 5: IG KNOB WILL NOT TURN (KEYLESS OPERATION IS NOT RECOGNIZED).
The engine will not start with KOS (IG knob operates normally).	Refer to INSPECTION PROCEDURE 6: THE ENGINE WILL NOT START WITH KOS (IG KNOB OPERATES NORMALLY).
Engine does not start with emergency key.	Refer to INSPECTION PROCEDURE 7: ENGINE DOES NOT START WITH EMERGENCY KEY.
No door will be locked or unlocked by operating a lock/unlock switch on any door.	Refer to INSPECTION PROCEDURE 8: NO DOOR WILL BE LOCKED OR UNLOCKED BY OPERATING A LOCK/UNLOCK SWITCH ON ANY DOOR.
Driver's door lock/unlock switch does not work.	Refer to INSPECTION PROCEDURE 9: DRIVER'S DOOR LOCK/UNLOCK SWITCH DOES NOT WORK.
Front passenger's door lock/unlock switch does not work.	Refer to INSPECTION PROCEDURE 10: FRONT PASSENGER'S DOOR LOCK/UNLOCK SWITCH DOES NOT WORK.
Trunk lid open switch does not work. < LANCER >	Refer to INSPECTION PROCEDURE 11: TRUNK LID OPEN SWITCH DOES NOT WORK. < LANCER >
The lock switch and liftgate lock release handle of the liftgate lock release handle do not work. < LANCER SPORTBACK >	Refer to INSPECTION PROCEDURE 12: THE LOCK SWITCH AND OPEN SWITCH OF THE LIFTGATE LOCK RELEASE HANDLE DO NOT WORK. < LANCER SPORTBACK >
The lock switch of the liftgate lock release handle does not perform the locking operation. < LANCER SPORTBACK >	Refer to INSPECTION PROCEDURE 13: THE LOCK SWITCH OF THE LIFTGATE LOCK RELEASE HANDLE DOES NOT PERFORM THE LOCKING OPERATION < LANCER SPORTBACK >.
Liftgate lock release handle does not perform the unlocking operation. < LANCER SPORTBACK >	Refer to INSPECTION PROCEDURE 14: THE OPEN SWITCH OF THE LIFTGATE LOCK RELEASE HANDLE DOES NOT PERFORM THE UNLOCKING OPERATION < LANCER SPORTBACK >.
Keyless entry system does not work.	Refer to INSPECTION PROCEDURE 15: KEYLESS ENTRY SYSTEM DOES NOT WORK.
KOS timer lock function does not work.	Refer to INSPECTION PROCEDURE 16: KOS TIMER LOCK FUNCTION DOES NOT WORK.
Keyless entry hazard light answerback function, the dome light answerback function or the horn answerback function does not work normally.	Refer to INSPECTION PROCEDURE 17: KEYLESS ENTRY HAZARD LIGHT ANSWERBACK FUNCTION, THE DOME LIGHT ANSWERBACK FUNCTION OR THE HORN ANSWERBACK FUNCTION DOES NOT WORK NORMALLY.
The trunk is not opened when the keyless operation key "TRUNK" button is operated. < LANCER >	Refer to INSPECTION PROCEDURE 18: THE TRUNK IS NOT OPENED WHEN THE KEYLESS OPERATION KEY "TRUNK" BUTTON IS OPERATED < LANCER >.
Outer tone alarm does not sound.	Refer to INSPECTION PROCEDURE 19: OUTER TONE ALARM DOES NOT SOUND.
Power door locks with selective unlocking does not work.	Refer to INSPECTION PROCEDURE 20: POWER DOOR LOCKS WITH SELECTIVE UNLOCKING DOES NOT WORK.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.