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June 2013
Electrical Systems Operation & Diagnosis Module (602)
Sunload Sensor 4 Wires (ARTWORK)
A comparator circuit is built inside the Sunload
Sensor that produces a constant triangle or
ramp wave. This provides one input to the
comparator circuit.
The other input is the voltage generated by the
absorbed sunlight. The comparator evaluates
the 2 voltages and outputs a square wave duty
ratio that is sent to the BIU. When the duty ratio
crosses a set level up or down, the headlights
and taillights turn on or off.
There are 4 levels of sensitivity that can be set
by a technician using the SMIII.
• Dull
• Normal
• Sensitive
• Very Sensitive
Note: The number of levels may change
by model.
These settings as listed on the SSMIII refer to
the Sunload Sensors ability to detect darkness.
Dull would be late on and early off.
Very Sensitive would be early on and late off.
The Integ mode of the SSMIII shows the duty
ratio from the Sunload Sensor.
Dull on approx. 150 HZ, Off approx. 440 HZ
Very Sensitive on approx 350 HZ, off 500 Hz
Use the BIU customizing Menu to adjust the
automatic headlight sensitivity.
If a customer prefers that the automatic
headlights activate closer to dark and turn off
early after sunrise then select “Dull”.
If long before dark and long after Sunrise
operation is preferred then select “Very Sensitive”
Normal and sensitive fall in between the two
extremes.
Headlight Assembly on Bench
The high beam and position light bulbs can
be serviced while the headlight assembly is
mounted in the car.
Note: Always review service
procedures in the applicable
Subaru Service Manual.
NOTES:
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