Mazda CX-9 2007 Service Highlights page 479

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AUTO LIGHT SENSOR FUNCTION
• The auto light sensor contains upward and forward illumination sensors which detect the level of illumination
above and in front of the vehicle respectively.
• If the forward illumination level sensor detects a bright level of illumination in front of the vehicle and the upward
illumination level sensor detects a dark level when the headlights are on, the microcomputer in the auto light
sensor prepares for turning off the lights. If both illumination level sensors detect that is necessary to turn off
the headlights, they are turned off with optimal timing.
• If the forward illumination level sensor detects a dark level of illumination in front of the vehicle and the upward
illumination level sensor detects a bright level when the headlights are off, the microcomputer in the auto light
sensor prepares for turning on the lights If both illumination level sensors detect that is necessary to turn on the
headlights, they are turned on with optimal timing.
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AUTO LIGHT SENSOR OPERATION
Caution
• In the following cases, the auto light sensor cannot detect the illumination level correctly which
could cause an auto light malfunction:
— A sticker or label is adhered to the windshield above the auto light sensor.
— The windshield is dirty above the auto light sensor.
• The auto light sensor is installed to the lens which is installed to top center area of the windshield
• The auto light sensor is integrated with the rain sensor as a single unit.
• The upward and forward illumination level sensors which detect the level of illumination above and in front of
the vehicle respectively are built-in.
AUTO-LIGHT SENSOR
(RAIN SENSOR)
Function Description
Illumination level adjustment function
• The illumination level sensitivity can be switched between two levels using the M-MDS.
On-board diagnostic function
• If there is any malfunction in the auto light sensor, the auto light/wiper control module is informed of the
malfunction and a DTC is detected.
LIGHTING SYSTEMS
FORWARD ILLUMINATION LEVEL SESOR
UPWARD ILLUMINATION LEVEL SESOR
id091800102200
id091800102300
LENS
AUTO-LIGHT SENSOR
(RAIN SENSOR)
ac9uun00000126
RAIN SENSOR
DETECTION AREA
ac9uun00000591
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