AUTO LIGHT SENSOR
id091800010600
Purpose
• The auto light sensor detects the illumination level above and in front of the vehicle and outputs it to the front body control module (FBCM).
Function
• The auto light sensor uses the upward illumination level sensor to detect the illumination level above the vehicle, and uses the forward illumination level sensor to detect the illumination level in front of the vehicle.
Illumination level adjustment function
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• The illumination level can be switched through 5 levels using the Mazda Modular Diagnostic System (M-MDS) or the center display (with center display). (See
LIGHTING SYSTEM PERSONALIZATION.)
On-board diagnostic function
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• Notifies front body control module (FBCM) of a malfunction in the auto light sensor, and a DTC is detected from the front body control module (FBCM).
• For details on DTCs, refer to the ON-BOARD DIAGNOSTIC [FRONT BODY CONTROL MODULE (FBCM)], DTC table in the Workshop Manual.
Construction
• The auto light sensor is integrated with the rain sensor as a single unit.
• The auto light sensor consists of the lens, forward illumination level sensor (photodiode), upward illumination level sensor (photodiode), and microcomputer.
Operation
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Caution
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• Correct illumination level detection is not be possible under the following conditions and could cause the system to operate incorrectly.
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― Stickers or labels are attached to the auto light sensor detection area on the windshield.
― The auto-light sensor detection area on the windshield is dirty.
1. When the ignition is switched ON (engine off or on), the auto light sensor detects (1) the illumination level above and in front of the vehicle.
2. The auto light sensor outputs (2) a panel light or TNS (parking lights) and headlight LO illumination request signal and panel light or TNS (parking lights) and headlight LO off request signal to the front body control module (FBCM) via LIN communication according to the detected illumination level.
Fail-safe
• Not applicable
