Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2900 ahl control

Subaru Legacy BN/BS (2015-2019) Service Manual / Auto headlight beam leveler system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2900 ahl control

DTC DETECTING CONDITION:

Detected when internal malfunction occurs in the auto headlight beam leveler CM.

TROUBLE SYMPTOM:

The auto headlight beam leveler does not operate.

CAUTION:

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

STEP	CHECK	YES	NO
1.CHECK DTC. 1) Turn the ignition switch to OFF > ON. 2) Turn on the headlight low beam. 3) Using the Subaru Select Monitor, clear the auto headlight beam leveler system memory. Clear Memory Mode 4) Use the Subaru Select Monitor and read DTCs. Read Diagnostic Trouble Code (DTC)	Is DTC B2900 displayed- (current malfunction)	Replace the auto headlight beam leveler CM. Auto Headlight Beam Leveler Control Module	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

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Detected when CAN data (vehicle speed signal) is not received from VDC.NOTE:Perform the diagnosis for LAN system. Basic Diagnostic Procedure > PROCEDURE ...

Other materials:

Basic diagnostic procedure procedure
STEPCHECKYESNO1.PERFORM CUSTOMER INTERVIEW.Using the Check List for Interview, ask the customer the condition of how trouble occurs. Check List for Interview > CHECKDid you interview the customer- Basic Diagnostic Procedure > PROCEDUREInterview the customer. Check List for Interview > CHECK2.CHECK ...