Eclipse L4-2.4L SOHC (2004)
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): ON
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Turn-signal light switch: ON
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The ETACS-ECU flashes the turn-signal lights under the following conditions:
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Ignition key: "ON" position
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Turn-signal light switch: Left or right turn-signal position
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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Malfunction of column switch (turn-signal light and lighting switch)
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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: Harness Set
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MB991958: Scan Tool (MUT-III Sub Assembly)
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MB991824: Vehicles communication interface
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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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MB991922: Probe harness
STEP 1. Check the hazard warning light.
Q: Do the hazard warning lights work normally?
YES: Go to Step 7.
NO: Go to Step 2.
STEP 2. Check the turn-signal lights.
Q: Does either of the turn-signal lights illuminate?
Only right or left side light does not illuminate: Go to Step 3.
Turn-signal lights do not illuminate at all: Go to Step 4.
