AUTO LIGHT SENSOR

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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

• The illumination level can be switched through 5 levels by using the Mazda Modular Diagnostic System (M-MDS) or the center display (with center display). (See LIGHTING SYSTEM PERSONALIZATION.)

On-board diagnostic function

• If there is a malfunction in the auto light sensor, notifies the front body control module (FBCM) and detects a DTC from the front body control module (FBCM).

• For details on DTCs, refer to the DTC table [ON-BOARD DIAGNOSTIC SYSTEM [FRONTY BODY CONTROL MODULE (FBCM)] ]. (See ON-BOARD DIAGNOSTIC SYSTEM [FRONT BODY CONTROL MODULE (FBCM)].)

Construction

• The auto light sensor is integrated with the rain sensor as a single unit.

• 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 be possible under the following conditions and could cause the system to operate incorrectly.

― Stickers or labels are attached to the auto light sensor area on the windshield.

― Dirt is adhering to the auto light sensor area on the windshield.

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/off signal to the front body control module (FBCM) according to the detected illumination level.

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Fail-safe

• Not applicable