Eclipse GS L4-2350cc 2.4L SOHC MFI (2002)
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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Malfunction of column switch (turn-signal light and lighting switch)
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Malfunction of the front-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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MB991862: SWS Monitor Kit
