Montero XLS 4WD V6-3.5L SOHC (2001)
TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU operates the light reminder tone alarm function, based on input signals from the following switches and the front-ECU:
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Ignition switch (IG1)
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Driver's door switch
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Taillight switch
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Headlight 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 driver's door switch
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Malfunction of the column switch (turn-signal light and lighting 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
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MB991502: Scan Tool (MUT-II)
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MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the ETACS-ECU power supply circuit.
If the ignition switch is at "LOCK" (OFF) position, do all of the following functions operate?
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Ignition key reminder tone alarm function
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Central door locking system
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Ignition key hole illumination light
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Hazard warning light
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Dome light dimming function
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Theft-alarm system
Q: Do any functions described above operate?
YES: Go to Step 2 <when using scan tool MB991502> or 3 <when using a voltmeter>.
NO: Check the ETACS-ECU battery circuit. Refer to Inspection Procedure R-1.
STEP 2. Check the input signal (by using scan tool MB991502). Check the input signals from the following switches:
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Ignition switch (IG1)
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Driver's door switch Taillight switch
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Headlight 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 light reminder tone alarm function should work normally.
NO: Check the relevant input circuit.
