Eclipse V6-3.0L SOHC (2003)
Fog Lights Circuit Part 2
CIRCUIT OPERATION
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The ETACS-ECU sends a fog light illumination request signal ("LIGHT ON" signal) to the front-ECU when the fog light switch is turned on while
the headlights are illuminating at low beam.
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Then the front-ECU switches on its relay to illuminate the fog lights.
TECHNICAL DESCRIPTION (COMMENT)
If the headlights illuminate at low beam, the fog light relay, the fog light switch, the front-ECU or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
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Malfunction of the fog light relay
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Malfunction of the fog light switch
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Malfunction of the front-ECU
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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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MB991862: SWS Monitor Kit
STEP 1. Check the headlight (low beam) operation.
Q: Do the headlights illuminate at low beam normally?
YES: Go to Step 2.
NO: Refer to Inspection Procedure J-2 "Headlights (low-beam) do not illuminate normally."
STEP 2. Check the input signal by using "FUNCTION DIAGNOSIS" of the SWS monitor.
Set each switch to the following condition before checking input signal from the fog light switch:
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Ignition switch: ON
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Fog light switch: ON
NOTE: Turn the ignition switch to the "Opposition in order to disable the headlight automatic shutdown function.