Lancer Sportback L4-2.4L (4B12) (2010)
TROUBLE JUDGMENT
The ETACS-ECU illuminates and extinguishes the front room light in accordance with the input signals below.
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Ignition switch (IG1)
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Key reminder switch
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Door switches
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Front door lock actuator
TECHNICAL DESCRIPTION (COMMENT)
If this does not work normally, the above switch input circuit(s), front dome light, or ETACS-ECU may have a problem.
TROUBLESHOOTING HINTS
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Malfunction of the key reminder switch
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Malfunction of door switch
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Malfunction of the front door lock actuator switch
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Malfunction of front dome light
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Malfunction of the ETACS-ECU
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The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
Required Special Tools:
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MB991958: Scan Tool (M.U.T.-III Sub Assembly)
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MB991824: Vehicle Communication Interface (V.C.I.)
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MB991827: M.U.T.-III USB Cable
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MB991910: M.U.T.-III Main Harness (Vehicles with CAN communication system)
STEP 1. Rear dome light operation check.
Check that the rear dome light illuminates and extinguishes normally.
Q: Does rear dome light work normally?
YES : Go to Step 2.
NO : Replace the ETACS-ECU.
STEP 2. Using scan tool MB991958, read the diagnostic trouble code.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or
disconnecting scan tool MB991958.