DTC B2900 AHL Control

DTC detecting condition: 

The microcomputer malfunction in the auto headlight beam leveler control module is detected.

Trouble symptom: 

The auto headlight beam leveler does not operate.

1. CHECK DTC  .
   1. Turn the ignition switch OFF → ON.
   2. Turn on the headlight low beam.
   3. Using the Subaru Select Monitor, perform the clear memory of [Headlight/Foglight]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
   4. Read the DTC of [Headlight/Foglight] using the Subaru Select Monitor. Ref. to HEADLIGHT/FOGLIGHT (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 

   Is any of DTC B2900, B2916, B2917, B2919, or B291A displayed? (Current code)

   Yes  : Replace the auto headlight beam leveler control module. Ref. to LIGHTING SYSTEM>AUTO HEADLIGHT BEAM LEVELER CONTROL MODULE

   No  : 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.