Montero V6-3.8L SOHC (2005)
YES: Replace the front-ECU. Verify that the headlights (low-beam) illuminate normally.
NO: Go to Step 5.
STEP 5. Check the wiring harness between front-ECU connector A-07X (terminals 3, 4) and the battery.
Q: Is the wiring harness between front-ECU connector A-07X (terminals 3, 4) and the battery in good condition?
YES: No action is necessary and testing is complete.
NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the
connector. Repair the wiring harness as necessary. Verify that the headlights (low-beam) illuminate normally.
Inspection Procedure J-4
Headlight and Taillight: Headlights do not illuminate when the passing switch is operated.
NOTE: This troubleshooting procedure requires the use of scan tool MB991958 and SWS monitor kit MB991862. For details on how to use the SWS
monitor, refer to "How to use SWS monitor."
TECHNICAL DESCRIPTION (COMMENT)
If both of the headlights (low-beam and high-beam) do not illuminate, the input circuit from the passing switch or the front-ECU may be defective.
TROUBLESHOOTING HINTS
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The column switch may be defective
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The front-ECU may be defective
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The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
Required Special Tools:
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MB991223: Harness Set
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MB991958: Scan Tool (MUT-III Sub Assembly)
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MB991824: Vehicle Communication Interface (V.C.I.)
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MB991827: MUT-III USB Cable
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MB991911: MUT-III Main Harness B
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MB991813: SWS Monitor Kit
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MB991806: SWS Monitor Cartridge
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MB991812: SWS Monitor Harness (For Column-ECU)
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MB991822: Probe Harness
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MB991854: SWS Monitor Harness (For 13-pin)
STEP 1. Verify the headlight operation.
Q: Do the headlights (low-beam and high-beam) illuminate normally?
Headlights do illuminate normally : Go to Step 2.
Headlights (low-beam) do not illuminate normally : Refer to Inspection Procedure J-2 "Headlights (low-beam) do not illuminate."
Headlights (high-beam) do not illuminate normally : Refer to Inspection Procedure J-3 "Headlights (high-beam) do not illuminate."
