Subaru Legacy BN/BS (2015-2019) Service Manual: Diagnostics with phenomenon inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Auto headlight beam leveler system (diagnostics) / Diagnostics with phenomenon inspection

1. BEAM LEVEL CONTROL DOES NOT FUNCTION

CAUTION:

• Before performing diagnosis, check the fuse in this circuit.

• Initialization is required after replacing the auto headlight beam leveler CM.

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Headlight beam leveler system Headlight Beam Leveler System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK CURRENT DATA. Display «Control module voltage» using Subaru Select Monitor. Read Current Data	Does the current data indicate the standard value-	Diagnostics with Phenomenon > INSPECTION	Diagnostics with Phenomenon > INSPECTION
2.CHECK HARNESS BETWEEN POWER SUPPLY — AUTO HEADLIGHT BEAM LEVELER CM. 1) Disconnect the auto headlight beam leveler CM connector. 2) Turn the ignition switch to ON. 3) Measure the voltage between the auto headlight beam leveler CM connector and chassis ground. Connector & terminal (B150) No. 1 (+) — Chassis ground (−):	Is the voltage 8 — 16 V-	Replace the auto headlight beam leveler CM. Auto Headlight Beam Leveler Control Module	Repair or replace the harness.
3.CHECK INDICATOR OUTPUT. Turn the ignition switch to ON.	Does the warning indicator turn on for three seconds-	Diagnostics with Phenomenon > INSPECTION	Diagnostics with Phenomenon > INSPECTION
4.CHECK CURRENT DATA. 1) Display «Indicator Signal» using Subaru Select Monitor. Read Current Data 2) Turn the ignition switch to ON.	Is it set as ON for 3 seconds-	Check the combination meter. Basic Diagnostic Procedure > PROCEDURE	Replace the auto headlight beam leveler CM. Auto Headlight Beam Leveler Control Module
5.CHECK INDICATOR OUTPUT. Leave the ignition switch to ON for 10 seconds.	Does the warning indicator light go off-	Diagnostics with Phenomenon > INSPECTION	Diagnostics with Phenomenon > INSPECTION
6.CHECK HEADLIGHT ASSEMBLY (ACTUATOR) DRIVE. 1) Connect the auto headlight beam leveler CM connector. 2) Turn the ignition switch to ON, and within 10 seconds, repeat the OFF > Low beam of headlight switch 5 times. 3) Check that the headlight beam drops once, then returns to normal. 4) Then, after waiting for 30 seconds or more with the ignition ON, turn the ignition switch to OFF.	Does the headlight beam drop down once, and then return-	Replace the auto headlight beam leveler CM. Auto Headlight Beam Leveler Control Module	Diagnostics with Phenomenon > INSPECTION
7.CHECK HEADLIGHT ASSEMBLY (ACTUATOR) OUTPUT. 1) Display «Actuator Signal» using Subaru Select Monitor. Read Current Data 2) Turn the ignition switch to ON, and within 10 seconds, repeat the OFF > Low beam of headlight switch 5 times. 3) Check that the headlight beam drops once, then returns to normal. 4) Then, after waiting for 30 seconds or more with the ignition ON, turn the ignition switch to OFF.	Does the current data indicate the standard value- (Does the value change at 10 — 90%-)	Diagnostics with Phenomenon > INSPECTION	Replace the auto headlight beam leveler CM. Auto Headlight Beam Leveler Control Module
8.CHECK OUTPUT VOLTAGE BETWEEN HEADLIGHT ASSEMBLY (ACTUATOR). 1) Disconnect the auto headlight beam leveler CM connector. 2) Turn the ignition switch to ON. 3) Measure the voltage between the auto headlight beam leveler CM connector and chassis ground. Connector & terminal (B150) No. 10 (+) — Chassis ground (−):	Is the voltage 8 — 16 V-	Replace the headlight assembly. Headlight Assembly	Diagnostics with Phenomenon > INSPECTION
9.CHECK HARNESS BETWEEN AUTO HEADLIGHT BEAM LEVELER CM AND HEADLIGHT ASSEMBLY (ACTUATOR). 1) Disconnect the connector of headlight assembly. 2) Measure the continuity between the auto headlight beam leveler CM connector and headlight assembly (actuator) connector. Connector & terminal • Headlight beam leveler RH (B150) No. 10 — (B487) No. 10: (B150) No. 17 — (B487) No. 9: (B150) No. 11 — (B487) No. 8: • Headlight beam leveler LH (B150) No. 10 — (B477) No. 10: (B150) No. 17 — (B477) No. 9: (B150) No. 11 — (B477) No. 8:	Is there continuity-	Replace the auto headlight beam leveler CM. Auto Headlight Beam Leveler Control Module	Repair the open circuit or poor contact of the connector in the harness between headlight assembly and auto headlight beam leveler CM.
10.CHECK DTC. Display DTC using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is DTC displayed-	Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC) > LIST	Replace the auto headlight beam leveler CM. Auto Headlight Beam Leveler Control Module

Clear memory mode operation

1. On «Start» display, select «Diagnosis».2. On «Vehicle selection» display, input the target vehicle information and select «Confirmed».3. On «Main Menu» display, select «Each System».4. ...

Electrical component location location

(1)Headlight ASSY– Headlight beam leveler actuator(4)Headlight relay Hi LH(7)Auto headlight beam leveler CM(2)Rear vehicle height sensor(5)Headlight relay Hi RH(8)Body integrated unit(3)Headlight r ...

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