Lancer L4-2.4L SOHC (2005)
Turn-signal Light Power Supply Circuit Part 2
CIRCUIT OPERATION
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The turn-signal light switch sends a signal through the column-ECU (incorporated in the column switch) to the ETACS-ECU. If the column-ECU
sends a turn-signal light switch "ON" signal to the ETACS-ECU, the ETACS-ECU turns on the flasher timer (incorporated in the ETACS-ECU),
thus causing the turn-signal lights to flash.
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The ETACS-ECU operates the turn-signal lights according to the following signals:
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Ignition switch (IG1)
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Turn-signal light switch
TECHNICAL DESCRIPTION (COMMENT)
Is the turn-signal lights do not flash normally, the input circuits from the switches described in "CIRCUIT OPERATION" or the ETACS-ECU may be
defective. If the hazard warning lights do not flash, the power supply line to the ETACS-ECU (dedicated to the turn-signal lights) 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 ETACS-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
STEP 1. Verify the hazard warning light.
Q: Does the hazard warning light work normally?
YES: Go to Step 7.
NO: Go to Step 2.
STEP 2. Verify the turn-signal lights.
Q: Does either of the turn-signal lights illuminate?
