Lancer L4-2.4L SOHC (2005)
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 sup- ply 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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The ETACS-ECU may be defective
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The column switch 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
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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. Use scan tool MB991958 to select "ECU COMM CHK" on the SWS monitor display.
