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 MANUALSMITSUBISHI2005LANCER L4-2.4L SOHCREPAIR AND DIAGNOSISBODY AND FRAMELOCKSKEYLESS ENTRYDESCRIPTION AND OPERATION
2005 Mitsubishi Lancer L4-2.4L SOHC
Keyless Entry: Description and Operation
2005 Mitsubishi Lancer L4-2.4L SOHCSECTION Description and Operation
KEYLESS ENTRY SYSTEM
Some models are equipped with a radio-controlled keyless entry system. The main features are:
- Antenna and receiver are incorporated in the ETACS-ECU.
- ID code can be registered by using the scan tool MB991958 (MUT-III sub assembly).
- Transmitter is a key holder type, which incorporates lock button and unlock button.
- The locking is answered back by two times' flashing of the doom light, two times' flashing of the turn signal lights and one time sounding of the horn answerback.
- The unlocking is answered back by illuminating of the doom light for 15 seconds and one time flashing of the turn signal lights.
GENERAL DESCRIPTION CONCERNING THE KEYLESS ENTRY SYSTEM
The following ECUs affect the functions and control of the keyless entry system.
ALL DOOR LOCK FUNCTION
OPERATING THE TRANSMITTER LOCK SWITCH
When the transmitter lock switch is pressed, the ETACS-ECU energizes its door lock relay to operate all the door lock actuators for 0.25 second thus causing all doors to be locked.
DRIVER'S DOOR UNLOCK FUNCTION
OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS ONCE
When the transmitter unlock switch is pressed once, the ETACS-ECU energizes its door unlock relay to operate the door lock actuator of the driver's door for 0.25 seconds thus causing only the driver's door to be unlocked.
ALL DOOR UNLOCK FUNCTION
OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS TWICE
When the transmitter unlock switch is pressed twice, the ETACS-ECU energizes its door unlock relay to operate the driver's door lock actuator and the other door lock actuators for 0.25 seconds each in succession. Then, the doors will be unlocked.
KEYLESS ENTRY HAZARD ANSWERBACK AND HORN ANSWERBACK FUNCTION
The hazard answerback and horn answerback function which facilities checking of lock or unlock operations even during day-time is provided. When the lock signal is input from the keyless entry transmitter to the ETACS-ECU, the hazard light flashes twice and horn sounds once. When the unlock signal is input, hazard light flashes once.
NOTE: Hazard answerback function can be disabled by the configuration function.
Some models are equipped with a radio-controlled keyless entry system. The main features are:
- Antenna and receiver are incorporated in the ETACS-ECU.
- ID code can be registered by using the scan tool MB991958 (MUT-III sub assembly).
- Transmitter is a key holder type, which incorporates lock button and unlock button.
- The locking is answered back by two times' flashing of the doom light, two times' flashing of the turn signal lights and one time sounding of the horn answerback.
- The unlocking is answered back by illuminating of the doom light for 15 seconds and one time flashing of the turn signal lights.
GENERAL DESCRIPTION CONCERNING THE KEYLESS ENTRY SYSTEM
The following ECUs affect the functions and control of the keyless entry system.
ALL DOOR LOCK FUNCTION
OPERATING THE TRANSMITTER LOCK SWITCH
When the transmitter lock switch is pressed, the ETACS-ECU energizes its door lock relay to operate all the door lock actuators for 0.25 second thus causing all doors to be locked.
DRIVER'S DOOR UNLOCK FUNCTION
OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS ONCE
When the transmitter unlock switch is pressed once, the ETACS-ECU energizes its door unlock relay to operate the door lock actuator of the driver's door for 0.25 seconds thus causing only the driver's door to be unlocked.
ALL DOOR UNLOCK FUNCTION
OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS TWICE
When the transmitter unlock switch is pressed twice, the ETACS-ECU energizes its door unlock relay to operate the driver's door lock actuator and the other door lock actuators for 0.25 seconds each in succession. Then, the doors will be unlocked.
KEYLESS ENTRY HAZARD ANSWERBACK AND HORN ANSWERBACK FUNCTION
The hazard answerback and horn answerback function which facilities checking of lock or unlock operations even during day-time is provided. When the lock signal is input from the keyless entry transmitter to the ETACS-ECU, the hazard light flashes twice and horn sounds once. When the unlock signal is input, hazard light flashes once.
NOTE: Hazard answerback function can be disabled by the configuration function.
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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.