AUTO LIGHT SENSOR

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Purpose

Function

Illumination level adjustment function

•  The illumination level can be switched between 5 levels using the Mazda Modular Diagnostic System (M-MDS).

•  For details on the illumination level adjustment method, refer to the personalization function setting method in the Workshop Manual.

On-board diagnostic function

•  The auto light sensor performs on-board diagnostics when the ignition is switched ON. If a malfunction is detected in the auto light sensor, an error signal is sent to the BCM. The BCM outputs DTCs based on error signals from the auto light sensor.

•  For details on DTC’s, refer to the diagnostic system (BCM) DTC list (BCM) in the Workshop Manual.

Construction

•  The auto light sensor is installed to the bracket in the upper center part of the windshield.

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•  The auto light sensor consists of lens, forward illumination level sensor (photodiode), upward illumination level sensor (photodiode), and microcomputer.

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Operation

Caution

•  Correct illumination level detection is not possible under the following conditions and could cause the system to operate incorrectly.

―  Stickers or labels are adhered to the auto light sensor detection area in the upper part of the windshield.

―  The auto light sensor detection area in the upper part of the windshield is dirty.

1.  The auto light sensor detects the illumination level above and in front of vehicle when the ignition is switched ON and the light switch is switched to the AUTO position.

2.  The auto light sensor outputs the TNS and headlight (LO) illumination signals to the BCM according to the detected illumination level.

Fail-safe