Montero Sport V6-3.5L SOHC (2004)
Day Time Running Light Circuit Part 2
CIRCUIT OPERATION
If the ignition switch is turned to the "ON" position, and battery positive voltage will be applied from the daytime running light-ECU to the headlights.
Daytime running light-ECU terminal No.3 sends a constant voltage to the headlights at a constant frequency. This causes the headlights to dim more than
normal low-beam.
When the lighting switch is turned to the "HEAD" position or the passing switch is turned on, daytime running light-ECU terminal No.3 ceases the
voltage supply. This causes the headlights to illuminate at normal low-beam.
TECHNICAL DESCRIPTION (COMMENT)
The cause may be a faulty daytime running light circuit or a faulty daytime running light-ECU.
TROUBLESHOOTING HINTS
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Malfunction of the daytime running light-ECU
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Malfunction of the daytime running light relay
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Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
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MB991223: Harness Set
STEP 1. Check the daytime running light-ECU power supply (battery) circuit at daytime running light-ECU connector A-96.
