Montero XLS 4WD V6-3.5L SOHC (2001)
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MB991223: Test Harness Set
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MB991502: Scan Tool (MUT-II)
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MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the answerback set condition. Activate the answerback functions. (Refer to Keyless Entry System - On-vehicle Service -
Enabling/disabling the Answerback Function.)
Q: Does the answerback function work normally?
YES: There is no action to be taken.
NO: Go to Step 2.
STEP 2. Check trouble symptom.
Q: Which component(s) does not operate through the answerback?
Only the dome light: Go to Step 3.
Only the hazard warning lights: Go to Step 4.
Only the horns: Go to Step 5.
None of the dome light, the turn-signal lights, and the horn: Replace the ETACS-ECU. The answerback function should work normally.
STEP 3. Check the dome light dimming function.
Q: Does the dome light dimming function work normally?
YES: Replace the ETACS-ECU. The answerback function should work normally.
NO: Solve the problem first. Refer to Inspection Procedure Q-2.
STEP 4. Check the hazard warning light operation.
Q: Do the hazard warning lights operate normally?
YES: Replace the ETACS-ECU. The answerback function should work normally.
NO: Solve the problem first. Refer to Inspection Procedure M-2.
STEP 5. Check the working of the horn by the theft-alarm system.
Q: Does the horn work normally by the theft-alarm system?
YES: Replace the ETACS-ECU. The answerback function should work normally.
NO: Solve the problem first. Refer to Inspection Procedure P-2.
Inspection Procedure E-3
Keyless entry system: Encrypted code cannot be register
TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU activates the encrypted code register mode according to the following switch signals:
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Key reminder switch
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Hazard warning light switch
If the encrypted code register mode is not set, the relevant input signal circuit or the ETACS-ECU may be defective.
If a transmitter can not be registered although the encrypted code register mode is set, the transmitter or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
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Malfunction of the key reminder switch
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Malfunction of the hazard warning light switch
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Malfunction of the transmitter
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Malfunction of the ETACS-ECU
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Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools: