DTC U0181 Lost Communication With Headlamp Leveling Control Module: Trouble Symptom

Coordination control of auto headlight beam leveler CM does not operate normally.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.	Was the basic diagnostic procedure performed up to STEP 8?	Go to step 2.	Perform the basic diagnostic procedure. < Ref. to BASIC DIAGNOSTIC PROCEDURE . >
2 CHECK DTC. Check the displayed DTC.	Are DTCs other than U*** displayed?	Perform the diagnosis according to DTC.	Go to step 3.
3 CHECK DTC. Check the displayed DTC.	Is U0181 a current malfunction?	Go to step 4.	Go to step 8.
4 CHECK DTC. Check CAN communication circuit. < Ref. to CAN COMMUNICATION CIRCUIT CHECK . > Read the DTC using Subaru Select Monitor.	Is U0181 a current malfunction?	Go to step 5.	Go to step 8.
5 CHECK DTC. Using the Subaru Select Monitor, read DTC of all the systems.	Is the air conditioner data no-receive detected in several modules?	Replace the auto headlight beam leveler CM. < Ref. to AUTO HEADLIGHT BEAM LEVELER CONTROL MODULE . >	Go to step 6.
6 REPLACE MODULE. Replace the auto headlight beam leveler CM. Read the DTC using Subaru Select Monitor.	Is U0181 a current malfunction?	Go to step 7.	System is normal.
7 CHECK MODULE. Reinstall the auto headlight beam leveler CM. Replace the module that the DTC has been detected. Read the DTC using Subaru Select Monitor.	Is U0181 a current malfunction?	Replace the auto headlight beam leveler CM. < Ref. to AUTO HEADLIGHT BEAM LEVELER CONTROL MODULE . >	System is normal.
8 CHECK HARNESS. Shake the harness, and check for poor contact. Read the DTC using Subaru Select Monitor.	Is U0181 a current malfunction?	Repair the poor contact of harness, or replace the harness.	Go to step 9.
9 CHECK CONNECTOR. Check the connector used for high speed CAN for poor contact.	Is there poor contact of connector?	Repair the connector that has poor contact, or replace harness.	It is possible that temporary poor communication occurs. Delete the DTC.