Montero XLS 4WD V6-3.5L SOHC (2001)
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MB991502: Scan Tool (MUT-II)
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MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check method of the input signal
Q: Which is to be used, the scan tool or the voltmeter to check the input signal?
Scan tool MB991502: Go to Step 2.
Voltmeter: Go to Step 3.
STEP 2. Check the input signal (by using scan tool MB991502).
Check the input signals from the following switches:
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Key reminder switch
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Driver's and front passenger's door switch
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Driver's and front passenger's door lock actuator switch
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or
disconnecting scan tool MB991502.
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. The forgotten key prevention function should work normal.
NO: Check the relevant input circuit.
STEP 3. Check the input signal (by using scan tool MB991502). Check the input signals from the following switches:
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Key reminder switch
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Driver's and front passenger's door switch
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Driver's and front passenger'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. The forgotten key prevention function should work normally.
NO: Check the relevant input circuit.
Inspection Procedure D-1
Power window relay: Power windows do not work at all
