Lancer L4-2.4L SOHC (2005)
Windshield Wiper Motor Circuit Part 2
CIRCUIT OPERATION
The windshield 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 washer switch "ON" signal to the front-ECU, the front-ECU turns on the relay (incorporated in the front-ECU), thus causing the windshield
washer motor to be turned on.
TECHNICAL DESCRIPTION (COMMENT)
If the windshield washer does not work normally, the windshield washer motor, the column switch (wind- shield wiper and washer switch) or the
front-ECU may be defective.
TROUBLESHOOTING HINTS
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The windshield washer motor may be defective
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The column switch may be defective (windshield wiper and washer switch)
-
The front-ECU may be defective
-
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 windshield wiper.
Q: Does the windshield wiper operate normally?
YES: Go to Step 2.
NO: Refer to Inspection Procedure G-1 "Windshield wiper do not work at all."
STEP 2. Use scan tool MB991958 to select "ECU COMM CHK" on the SWS monitor display.
Check the following ECUs:
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Column-ECU
-
Front-ECU
