Stratus Coupe L4-2.4L VIN G (2003)
CIRCUIT OPERATION
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If the headlight switch signal from the column switch turns on, the front-ECU makes the headlights illuminate. Whenever the headlights illuminate,
the low-beam lights illuminate due to the headlight dimmer switch automatic resetting function.
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If the SWS communication line is defective, the low-beam headlights will illuminate by using other signal line (headlight back-up circuit).
TECHNICAL DESCRIPTION (COMMENT)
The column switch or the front-ECU may be defective.
NOTE: If only one of the headlights does not illuminate, the light bulb may be burned out or the wiring harness between the light and the front-ECU
may be defective. In this case, check the circuit by referring to Headlight. See: Lighting and Horns/Headlamp
TROUBLESHOOTING HINTS
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The column switch (turn-signal light and lighting switch) may be defective
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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: Test Harness Set
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MB991502: Scan Tool (MUT-II)
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MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the DTC.
Q: Doe the DTC set when the ignition switch is turned to the "LOCK" (OFF) position?
YES : Carry out the troubleshooting by referring to Diagnostic Trouble Code Chart. See: Trouble Code Diagnostic Charts
NO : Go to Step 2 <when using scan tool MB991502> or 3 <when using a voltmeter>.
STEP 2. Check the input signal (by using scan tool MB991502).
Check the input signal from the headlight switch.
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.
1. Connect scan tool MB991502 to the data link connector.
2. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.
Q: Does the tone alarm of scan tool MB991502 sound when the input signal enters?
YES : Go to Step 4.
NO : Check the headlight switch input circuit. See: Diagnosis By Symptom/Symptom Procedures/Inspection Procedure O-14
STEP 3. Check the input signal (by using a voltmeter).
Check the input signal from the headlight switch.
