Eclipse V6-3.0L SOHC (2003)
Column Switch Power Supply And SWS Communication Circuit Part 2
CIRCUIT OPERATION
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The power supply to the column switch is provided by the battery and the ignition switch (IG1).
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If the power supply system from the battery is defective, the system operates by the power supply from the ignition switch (IG1).
TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit to the column switch (column-ECU) may be defective. If the battery power supply circuit (terminal 1 of the column switch) to
the ECU is damaged, also check the power supply circuit from the ignition switch (IG1) (terminal 9 of the column switch), and repair if necessary.
TROUBLESHOOTING HINTS
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Malfunction of the ETACS-ECU
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Malfunction of the column switch
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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. Use scan tool to select "ECU COMM CHECK" on the SWS monitor display.
Check the following ECUs:
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ETACS-ECU
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Column-ECU
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or
disconnecting scan tool MB991502. Also connect SWS monitor kit MB991862 after turning on scan tool MB991502.
