Lancer L4-2.4L SOHC (2005)
Windshield Wiper Motor Circuit Part 2
CIRCUIT OPERATION
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The windshield wiper and washer switch sends a signal through the column-ECU (incorporated in the column switch) to the front-ECU. If the
column-ECU sends a windshield wiper and washer switch "ON" signal to the front-ECU, the front-ECU turns on the relay (incorporated in the
front-ECU), thus causing the windshield wiper and washer motor to be turned on
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If the SWS communication line is defective, the front-ECU operates windshield wiper motor by using the other communication lines (wiper
backup circuit) instead of that line. In this case, the windshield wiper works at low speed regardless of the windshield wiper and washer switch
positions ("LOW" or "HIGH").
TECHNICAL DESCRIPTION (COMMENT)
If the windshield wiper does not work at all, the wind- shield wiper motor, column switch (windshield wiper and washer switch) or the front-ECU may be
defective.
TROUBLESHOOTING HINTS
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The wiper motor may be defective
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The column switch may be defective (windshield wiper and washer switch)
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The front-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
