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 MANUALSMITSUBISHI2009LANCER L4-2.4L (4B12)REPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESWIRELESS CONTROL MODULE (WCM)INSPECTION PROCEDURE 6
2009 Mitsubishi Lancer L4-2.4L (4B12)
Inspection Procedure 6
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Inspection Procedure 6
Inspection Procedure 6: Keyless entry hazard light answer back function, the dome light answerback function or the horn answerback function does not work normally.
CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
TECHNICAL DESCRIPTION (COMMENT)
the hazard warning light and the dome light works normally, ETACS-ECU may be faulty. Also, the answerback function may have been disabled using the customization function.
TROUBLESHOOTING HINTS
- The turn signal lights may be defective
- The dome light may be defective
- The horn may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
STEP 1. Verify the operation hazard warning light.
Check that the hazard warning light illuminate normally.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Refer to inspection procedure 1: "Hazard warning light does not illuminate." Symptom Procedures
STEP 2. Verify the operation of the dome light.
Check that the dome lights illuminate normally.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Refer to inspection procedure 1 "The front dome light does not illuminate normally." Inspection Procedure 1 or inspection procedure 2 "The rear dome light does not illuminate normally." Inspection Procedure 2
STEP 3. Verify the horn.
Check that the horn normally.
Q: Is the check result normal?
YES: Go to Step 4.
NO: Replace the horn.
STEP 4. Check the operation of the keyless entry system.
Operate the transmitter and check that all doors lock and unlock.
Q: Is the check result normal?
YES: Go to Step 5.
NO: Refer to inspection procedure 5: "Keyless entry system does not work." Inspection Procedure 5
STEP 5. Check the customize function (Hazard light answerback).
Check that any one of the followings other than "Lock: 0, Unlock: 0" is set for "Hazard answerback" with a customization function.
- Lock:1, Unlock:2
- Lock:1, Unlock:0
- Lock:0, Unlock:2
- Lock:2, Unlock:1
- Lock:2, Unlock:0
- Lock:0, Unlock:1
Q: Is the check result normal?
YES: Go to Step 6.
NO: Set "Hazard answerback" to any one other than "Lock: 0, Unlock: 0" with a customization function. Configuration Function
STEP 6. Check the customize function (Horn answerback).
Check that any one of the followings other than "Not sound horn" is set for "Horn chirp by keyless" with a customization function.
- Lock any time
- W lock any time
Q: Is the check result normal?
YES: Go to Step 7.
NO: Set "Horn chirp by keyless" to any one other than "Not sound horn" with a customization function. Configuration Function
STEP 7. Check of the troubles
Check if the keyless entry answerback function works normally.
Q: Is the check result normal?
YES: Intermittent malfunction.
NO: Replace ETACS-ECU.
CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
TECHNICAL DESCRIPTION (COMMENT)
the hazard warning light and the dome light works normally, ETACS-ECU may be faulty. Also, the answerback function may have been disabled using the customization function.
TROUBLESHOOTING HINTS
- The turn signal lights may be defective
- The dome light may be defective
- The horn may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
STEP 1. Verify the operation hazard warning light.
Check that the hazard warning light illuminate normally.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Refer to inspection procedure 1: "Hazard warning light does not illuminate." Symptom Procedures
STEP 2. Verify the operation of the dome light.
Check that the dome lights illuminate normally.
Q: Is the check result normal?
YES: Go to Step 3.
NO: Refer to inspection procedure 1 "The front dome light does not illuminate normally." Inspection Procedure 1 or inspection procedure 2 "The rear dome light does not illuminate normally." Inspection Procedure 2
STEP 3. Verify the horn.
Check that the horn normally.
Q: Is the check result normal?
YES: Go to Step 4.
NO: Replace the horn.
STEP 4. Check the operation of the keyless entry system.
Operate the transmitter and check that all doors lock and unlock.
Q: Is the check result normal?
YES: Go to Step 5.
NO: Refer to inspection procedure 5: "Keyless entry system does not work." Inspection Procedure 5
STEP 5. Check the customize function (Hazard light answerback).
Check that any one of the followings other than "Lock: 0, Unlock: 0" is set for "Hazard answerback" with a customization function.
- Lock:1, Unlock:2
- Lock:1, Unlock:0
- Lock:0, Unlock:2
- Lock:2, Unlock:1
- Lock:2, Unlock:0
- Lock:0, Unlock:1
Q: Is the check result normal?
YES: Go to Step 6.
NO: Set "Hazard answerback" to any one other than "Lock: 0, Unlock: 0" with a customization function. Configuration Function
STEP 6. Check the customize function (Horn answerback).
Check that any one of the followings other than "Not sound horn" is set for "Horn chirp by keyless" with a customization function.
- Lock any time
- W lock any time
Q: Is the check result normal?
YES: Go to Step 7.
NO: Set "Horn chirp by keyless" to any one other than "Not sound horn" with a customization function. Configuration Function
STEP 7. Check of the troubles
Check if the keyless entry answerback function works normally.
Q: Is the check result normal?
YES: Intermittent malfunction.
NO: Replace ETACS-ECU.
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.