Eclipse V6-3.0L SOHC (2003)
in the front-ECU), thus causing the headlights to illuminate. The headlights always illuminate at low-beam by the headlight dimmer switch
automatic resetting function.
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If the SWS communication line is defective, the front-ECU operates the headlights by using the other communication lines (headlight backup
circuit) instead of that line.
TECHNICAL DESCRIPTION (COMMENT)
If the headlights (low-beam) do not illuminate normally, the column switch or the front-ECU 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 front-ECU
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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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Column-ECU
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Front-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.
1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate the MUT-II according to the procedure below to display "ECU COMM CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHECK."
5. Scan tool MB991502 should show "OK" on the "ECU COMM CHECK" menu.
Q: Are "OK" displayed on the "COLUMN ECU" and "FRONT ECU" menu?
"OK" are displayed for all the items : Go to Step 2.