Galant LS V6-3.0L SOHC (1999)
The headlight relay (high), the column switch or the front-ECU is suspected to be defective.
NOTE: If only one of the headlights does not illuminate, the light bulb may be burned out or the harness wires between the light and the headlight relay
(high-beam) may be defective. In this case, check the circuit by referring to Headlight.
TROUBLESHOOTING HINTS
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Malfunction of the headlight relay (high)
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Malfunction of the 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:
MB991223: Test Harness Set
MB991502: Scan Tool (MUT-II)
MB991529: Diagnostic Trouble Code Check Harness
STEP 1. Check the headlight (low-beam) operation.
If the headlights (low-beam) do not illuminate normally, solve the problem first. Refer to Inspection Procedure I-2.
If the headlights (low-beam) illuminate normally, go to Step 2.
STEP 2. Check the input signal.
Check the input signal from the dimmer switch.
<When using scan tool MB991502>
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "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.
<When using a voltmeter>
1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
2. Check that the voltmeter indicator deflects once when the input signal enters.
If a defect appears, check the dimmer switch input circuit. Refer to Inspection Procedure N-14.
If no defect appears, go to Step 3.
