Automatic Light Sensor

Repair Procedures

Inspection

Check whether the automatic light control operates as shown in the timing chart below. The tail lamp and headlamp (Low) are controlled based on the input of the auto light sensor (illumination intensity) when the auto light switch on the multifunction switch is on and the vehicle is in IGN1 or IGN2 ON mode. If IGN1 = ON, the BCM detects this voltage, and if the voltage exceeds the rated range, an automatic light malfunction occurs (below 4 V or above 6 V).

In IGN1 ON state, when the multifunction switch module detects auto light ON, the tail lamp relay output and low beam relay output are controlled according to the input signal of the auto light sensor. Automatic light control does not operate if the sensor power supply pin (regulated 5 V power from IGN1 to the light sensor) is shorted to ground. If IGN1 is ON, the BCM monitors the range of this power supply and sets a malfunction as soon as the voltage goes out of the permissible range. This malfunction then occurs, and while it is present, the headlamps must be turned on regardless of the sunlight level detected by the sensor. This is designed to prevent the headlamps from turning off when the malfunction occurs at night.

Removal

1. 1

   Disconnect the negative (-) battery terminal.

2. 2

   Remove the automatic light sensor (A).

3. 3

   Disconnect the auto light sensor connector (B).

   

Installation

1. 1

   Connect the auto light sensor connector.

2. 2

   Install the auto light sensor.

3. 3

   Connect the negative (-) battery terminal.