Montero LTD 4WD V6-3.5L SOHC (2002)
1. Connect scan tool MB991502 to the data link connector.
2. When the transmitter LOCK or UNLOCK switch is turned ON, check that scan tool MB991502 sounds.
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 R-10 "The ETACS-ECU does not receive signals from lock, unlock and unlock switches.
Inspection Procedure E-2
Keyless Entry System: The Dome Light, the Turn-signal Lights and the Horn do not Operate Through the Answerback Function.
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 theft-alarm horn
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Malfunction of the horn
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Malfunction of the dome light
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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.
NO: Refer to Inspection Procedure E-1 "Keyless entry system does network normally."
STEP 2. Check the answerback adjustment function.
Check the answerback functions. (Refer to Keyless Entry System - On-vehicle Service - Enabling/disabling the Answerback Function.)
Q: Does the answerback function work normally?
YES: No action to be taken.
NO: Go to Step 3.
STEP 3. Check trouble symptom.
Q: Which answerback function is defective?
Only the dome light : Go to Step 4.
Only the turn-signal lights : Go to Step 5.
Only the horns : Go to Step 6.
None of the dome light, the turn-signal lights, and the horn : Replace the ETACS-ECU. Check that the answerback functions work normally.
STEP 4. Check the dome light