Montero XLS 4WD V6-3.5L SOHC (2001)
Connectors
CIRCUIT OPERATION
The ETACS-ECU will sound the theft-alarm horn and horn if the theft-alarm system or the keyless entry system answerback is triggered.
TECHNICAL DESCRIPTION (COMMENT)
The theft-alarm horn and horn are shared by the keyless entry system. If the theft-alarm horn and horn sounds normally through the keyless entry system
answerback, the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
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Malfunction of the theft-alarm horn
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Malfunction of the horn Malfunction of the theft-alarm horn relay
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Malformation of the horn relay Malfunction of the ETACS-ECU
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Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
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MB991223: Test Harness Set
STEP 1. Check the keyless entry system horn answerback. Activate the keyless entry system horn answerback. (Refer to Keyless Entry System -
On-vehicle Service - Enabling/disabling the Answerback Function)
Q: Does the horn answerback function work?
YES: Replace the ETACS-ECU. The horn should sound when the theft-alarm system is triggered.
NO: Go to Step 2.
STEP 2. Check trouble symptom.
Q: Which horn does not sound?
The theft-alarm horn does not sound.: Go to Step 3.
The horn does not sound.: Go to Step.