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Electrical Systems Operation & Diagnosis Module
Headlights
The headlight operating logic for 2008 Impreza, 2009 Forester, 2010 Legacy and Outback and
newer vehicles is described below.
Lighting Switch
No parking switch is available.
Headlight operation
Condition
explanation of
condition
Normal
Ignition or Engine ON Turn switch to ON
Key In
Ignition OFF
Key Out
Automatic Transmission models - drLS do noT operATe In pArK.
All models parking brake on - drLS do noT operATe.
All models have a Headlight on indicator.
Additionally a setting for automatic headlights has been incorporated.
When in Auto Mode, the headlights and tail-lights turn on and off based on the ambient light
detected by the Sunload Sensor.
The Sunload Sensor (applicable models) of the HVAC System performs two jobs.
• Sunload for HVAC System
• Ambient light for the Automatic Headlights
Conventional Sunload Sensors have 2 wires.
The New Sunload Sensor has 4 wires.
B+, ground, analog signal to HVAC, and a wire delivering a digital signal to the BIU.
Headlights switch condition needed to turn on
headlights or parking lights
A. Lights turn ON when key is placed into the ignition
switch. (Lights were on when the key was last removed.)
B. Turn switch to ON
A. Turn switch to On
B. Turn switch OFF then ON
NOTE:
BUZZER SOUNDS IN THIS MODE WHEN
THE DRIVER'S DOOR IS OPEN
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(602)
June 2013
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