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 MANUALSMITSUBISHI2004ECLIPSE L4-2.4L SOHCREPAIR AND DIAGNOSISBODY AND FRAMELOCKSKEYLESS ENTRYDESCRIPTION AND OPERATION
2004 Mitsubishi Eclipse L4-2.4L SOHC
Keyless Entry: Description and Operation
2004 Mitsubishi Eclipse L4-2.4L SOHCSECTION Description and Operation
KEYLESS ENTRY SYSTEM
GENERAL DESCRIPTION CONCERNING 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 activates the lock relay output for 0.25 seconds and locks all doors.
DRIVER'S DOOR UNLOCK FUNCTION
OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS ONCE
When the transmitter unlock switch is pressed once, the ETACS-ECU activates the unlock relay output for 0.25 seconds and unlocks driver's door.
ALL DOOR UNLOCK FUNCTION
OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS TWICE
When the transmitter unlock switch is pressed twice, the ETACS-ECU activates the unlock relay output for 0.25 seconds and unlocks all doors.
TRUNK LID OPEN FUNCTION
OPERATING THE TRANSMITTER TRUNK SWITCH
When the transmitter trunk switch is pressed, the ETACS-ECU activates the open relay output for 0.25 seconds and open trunk lid.
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 daytime 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 (Refer to On-vehicle Service Simplified Wiring System (SWS)).
GENERAL DESCRIPTION CONCERNING 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 activates the lock relay output for 0.25 seconds and locks all doors.
DRIVER'S DOOR UNLOCK FUNCTION
OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS ONCE
When the transmitter unlock switch is pressed once, the ETACS-ECU activates the unlock relay output for 0.25 seconds and unlocks driver's door.
ALL DOOR UNLOCK FUNCTION
OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS TWICE
When the transmitter unlock switch is pressed twice, the ETACS-ECU activates the unlock relay output for 0.25 seconds and unlocks all doors.
TRUNK LID OPEN FUNCTION
OPERATING THE TRANSMITTER TRUNK SWITCH
When the transmitter trunk switch is pressed, the ETACS-ECU activates the open relay output for 0.25 seconds and open trunk lid.
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 daytime 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 (Refer to On-vehicle Service Simplified Wiring System (SWS)).
RENDER: 1.0x
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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.