Montero XLS 4WD V6-3.5L SOHC (2001)
1. Connect scan tool MB991502 to the data link connector.
2. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.
Q: Does the tone alarm of scan tool MB991502 sound when the input signal enters?
YES: Replace the ETACS-ECU. All doors should be locked by using the driver's inside lock knob.
NO: Check the driver's door lock actuator switch input circuit. Refer to Inspection Procedure Q-11.
STEP 3. Check the input signal (by using a voltmeter). Check the input signal from the driver's door lock actuator switch.
1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
2. Check that the voltmeter indicator deflects once when the input signal enters.
Q: Does the voltmeter indicator deflect?
YES: Replace the ETACS-ECU. All doors should be locked by using the driver's inside lock knob.
NO: Check the driver's door lock actuator switch input circuit. Refer to Inspection Procedure Q-11.
Inspection Procedure C-6
Central door locking system: Forgotten key prevention function does not operate
TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU operates the forgotten key prevention function, based on the input signals from the following switches:
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Key reminder switch
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Driver's or front passenger's door switch
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Driver's or front passenger's door lock actuator switch
If the function does not work normally, a defect on the relevant circuit or the ETACS-ECU may be suspected.
TROUBLESHOOTING HINTS
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Malfunction of the key reminder switch
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Malfunction of the driver's or front passenger's door switch
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Malfunction of the driver's or front passenger's door lock actuator switch
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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
