Honda Civic manuals

Subaru Legacy Service Manual: Dtc b2900 ahl control


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


The auto headlight beam leveler does not operate.


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



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.


In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

Dtc b2902 rear height sensor circuit
DTC DETECTING CONDITION:Rear vehicle height sensor error is detected for 10 seconds or more.TROUBLE SYMPTOM:The auto headlight beam leveler does not operate.CAUTION:Initialization is required after re ...

Dtc u0122 lost communication with vehicle dynamics control module
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:

1. INTAKE MANIFOLD(1)Intake manifold(10)Plug(19)Clip(2)Gasket(11)Fuel pipe protector LH (3)Manifold absolute pressure sensor(12)Fuel pipe ASSYTightening torque: N·m (kgf-m, ft-lb)(4)Filter(13)Fuel hoseT1:1.25 (0.1, 0.9)(5)Fuel pipe protector RH(14)ClampT2:6.4 (0.7, 4.7)(6)Purge control solen ...

© 2017-2022 Copyright