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Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc u0181 lost communication with headlamp leveling control module

DTC DETECTING CONDITION:

No data is received from auto headlight beam leveler CM or SRF CM.

TROUBLE SYMPTOM:

The auto headlight beam leveler or SRF does not operate normally.

STEPCHECKYESNO

1.CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.

Was the basic diagnostic procedure performed up to STEP 8-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

Perform the basic diagnostic procedure. Basic Diagnostic Procedure

2.CHECK DTC.

Check the displayed DTC.

Are DTCs other than U*** displayed-

Perform the diagnosis according to DTC.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

3.CHECK DTC.

Check the displayed DTC.

Is U0181 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

4.CHECK DTC.

1) Check CAN communication circuit. CAN Communication Circuit Check

2) Read the DTC using Subaru Select Monitor.

Is U0181 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

5.CHECK DTC.

Using the Subaru Select Monitor, read DTC of all the systems.

Is the auto headlight beam leveler data no-receive detected in several modules-

Replace the auto headlight beam leveler CM or SRF CM. Auto Headlight Beam Leveler Control Module Steering Responsive Fog Lights CM

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

6.REPLACE MODULE.

1) Replace the auto headlight beam leveler CM or SRF CM.

2) Read the DTC using Subaru Select Monitor.

Is U0181 a current malfunction-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

System is normal.

7.CHECK MODULE.

1) Reinstall the auto headlight beam leveler CM or SRF CM.

2) Replace the module that the DTC has been detected.

3) Read the DTC using Subaru Select Monitor.

Is U0181 a current malfunction-

Replace the auto headlight beam leveler CM or SRF CM. Auto Headlight Beam Leveler Control Module Steering Responsive Fog Lights CM

System is normal.

8.CHECK HARNESS.

1) Shake the harness, and check for poor contact.

2) Read the DTC using Subaru Select Monitor.

Is U0181 a current malfunction-

Repair the poor contact of harness, or replace the harness.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0181 LOST COMMUNICATION WITH HEADLAMP LEVELING CONTROL MODULE

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.

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Other materials:

Removal
1. Remove the transmission assembly. Automatic Transmission Assembly > REMOVAL2. Remove the air breather hose. Air Breather Hose > REMOVAL3. Remove the control valve body. Control Valve Body > REMOVAL4. Remove the transmission harness. Transmission Harness > REMOVAL5. Remove the turbine speed se ...

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