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).
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.
The illumination level can be switched through 5 levels using the Mazda Modular Diagnostic System (M-MDS) or the audio unit (with color LCD). (See LIGHTING SYSTEM PERSONALIZATION.)
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.
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.
CAUTION:
Correct illumination level detection is not be possible under the following conditions and could cause the system to operate incorrectly.
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. The auto light sensor detects the illumination level above and in front of the vehicle when the ignition is switched ON (engine off or on) and the light switch is operated to the AUTO position.
2. The auto light sensor outputs a TNS and headlight LO on or off signal to the front body control module (FBCM) according to the detected illumination level.
Function not equipped.