Lancer LS L4-2.0L SOHC (2002)
Q: When the transmitter LOCK or UNLOCK switch is turned ON, does scan tool MB991502 sound?
YES: Replace the ETACS-ECU. All the doors can be locked or unlocked by means of the transmitter.
NO: Refer to Inspection Procedure M-10 "ETACS-ECU does not receive a signal from the lock or unlock switch."
Inspection Procedure E-2
Keyless Entry System: The front dome Light, the Turn-signal Lights and the Horn do not Operate Through the Answerback Function
Connectors
CIRCUIT OPERATION
The ETACS-ECU operates the following functions when it receives lock or unlock signal from the transmitter:
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Dome light answerback function
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Turn-signal light answerback function
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Horn answerback function
TECHNICAL DESCRIPTION (COMMENT)
The turn-signal lights and horn answerback functions can be disabled or enabled. However, the dome light answerback function can not be disabled.
TROUBLESHOOTING HINTS
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Malfunction of the turn-signal light
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Malfunction of the dome light
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Malfunction of the horn
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Malfunction of the ETACS-ECU
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Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
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MB991223: Test Harness Set
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MB991502: Scan Tool (MUT-II)
STEP 1. Check the keyless entry system.
Q: Does the keyless entry system work normally?
YES: Go to Step 2.