Auto Headlight System Check

WARNING: This page is about a different car, the 2012 Subaru Outback and 2012 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Step	Check	Yes	No
1 CHECK HEADLIGHT ILLUMINATION. Set the lighting switch to the switch 1 (TAIL) and switch 2 (HEAD).	Do the tail and headlight illuminate?	Go to step 2 .	Check the combination switch (light) and headlight bulb.
2 CHECK INPUT SIGNAL. Prepare the Subaru Select Monitor kit. Turn the ignition switch to ON (engine OFF) and run the "PC application for Subaru Select Monitor". On << System Selection Menu >> display, select {Integ. unit mode}. Select the {Lighting AUTO input} from {Current Data Display & Save}.	Does the display switch between OFF ↔ ON when the lighting switch is moved to AUTO position?	Go to step 3 .	Go to step 8 .
3 CHECK INPUT SIGNAL. From {Current Data Display & Save}, select {Illumination Sensor Output}. Light up the darkness around light control sensor.	Is the value depending on the brightness output? (darkness: 47 - 53 Hz)	Check and replace the body integrated unit. Inspection: Refer to BASIC DIAGNOSTIC PROCEDURE . Replacement: Refer to BODY INTEGRATED UNIT .	Go to step 4 .
4 CHECK HARNESS. Disconnect the body integrated unit connector and light control sensor connector. Check the harness between body integrated unit connector and light control sensor connector. Connector & terminal (B280) No. 19 - (i194) No. 4: (B280) No. 29 - (i194) No. 6:	Is harness normal?	Go to step 5 .	Repair or replace the harness.
5 CHECK HARNESS. Turn the ignition switch to ON. Measure the voltage between light control sensor connector and chassis ground. Connector & terminal (i194) No. 3 (+) - Chassis ground (-):	Is the voltage 10 V or more?	Go to step 6 .	Repair or replace the harness.
6 CHECK BODY INTEGRATED UNIT. Connect the body integrated unit connector. Measure the resistance between body integrated unit connector and chassis ground. Connector & terminal (B280) No. 29 - Chassis ground:	Is the resistance less than 10 Ω?	Go to step 7 .	Replace the body integrated unit. Refer to BODY INTEGRATED UNIT .
7 CHECK LIGHT CONTROL SENSOR. Connect the light control sensor connector. Turn the ignition switch to ON. Set the lighting switch to AUTO position. Connect the Subaru Select Monitor, and read the waveform data between light control sensor connector. Connector & terminal (i194) No. 4 - No. 6: Courtesy of SUBARU OF AMERICA, INC.	Is waveform normal? (Interval of A becomes shorter as the surrounding becomes brighter.)	Go to step 8 .	Replace the light control sensor.
8 CHECK COMBINATION SWITCH (LIGHT). Check the combination switch (light). Refer to , INSPECTION , Combination Switch (Light).	Is the combination switch (light) normal?	Go to step 9 .	Replace the combination switch (light).
9 CHECK HARNESS. Disconnect the body integrated unit connector. Check the harness between body integrated unit connector and combination switch (light) connector. Connector & terminal (B71) No. 14 - (B281) No. 16:	Is harness normal?	Check and replace the body integrated unit. Inspection: Refer to BASIC DIAGNOSTIC PROCEDURE . Replacement: Refer to BODY INTEGRATED UNIT .	Repair or replace the harness.