Montero V6-3.8L SOHC (2005)
Headlight Relay (Low-Beam) Circuit
CIRCUIT OPERATION
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When the lighting switch is set to "HEAD" position, the "HEAD" signal is sent through the column-ECU (incorporated in the column switch) to
the front-ECU. If the front-ECU receives the "HEAD" signal through the column-ECU, the front-ECU turns on the headlight relay (incorporated in
the front-ECU), thus causing the headlights to illuminate. The headlights always illuminate at low-beam by the headlight dimmer switch automatic
resetting function.
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If the SWS communication line is defective, the front-ECU operates the headlights by using the other communication lines (headlight backup
circuit) instead of that line.
TECHNICAL DESCRIPTION (COMMENT)
If the headlights (low-beam) do not illuminate normally, the column switch or the front-ECU may be defective.
TROUBLESHOOTING HINTS
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The column switch (turn-signal light and lighting 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