DTC B2909: Steering Responsive Headlight Actuator LH

DTC detecting condition: 

Fail flag (failures shown below) of the SRH actuator is detected for 1 second or more.

• Overheating of the actuator driving IC is detected.
• Short circuit, open circuit of the motor coil is detected.
• Abnormality of the motor position sensor is detected.
• Motor lock is detected.

Trouble symptom: 

The steering responsive headlight does not operate. SRH indicator blinks.

Wiring diagram: 

Headlight beam leveler system. Refer to WIRING SYSTEM>HEADLIGHT BEAM LEVELER SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC. 
   1. Turn the ignition switch to OFF.
   2. Start the engine.
   3. Using the Subaru Select Monitor, clear the auto headlight beam leveler system memory. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>CLEAR MEMORY MODE .
   4. Use the Subaru Select Monitor and read DTCs. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B2909 displayed? (Current malfunction)

      Yes:  Go to  2.

      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.
2. CHECK OTHER DTCS. 

   Check whether or not other DTCs are stored in the auto headlight beam leveler system.

   Are DTCs other than DTC B2909 stored?

   Yes:  Perform the diagnosis for DTC other than B2909 first.

   No:  Go to  3.

3. CHECK HARNESS (OPEN CIRCUIT). 
   1. Turn the ignition switch to OFF.
   2. Disconnect the headlight assembly LH and RH connectors.
   3. Disconnect the auto headlight beam leveler Control Module connector.
   4. Using a tester, measure the resistance between auto headlight beam leveler Control Module connector and headlight assembly LH connector.

      Connector & terminal

      (B150) No. 7 - (F125) No. 14:

      (B150) No. 9 - (F125) No. 15:

      Is the resistance less than 1 Ω?

      Yes:  Go to  4.

      No:  Repair or replace the open circuit of harness.

4. CHECK HARNESS (GROUND SHORT CIRCUIT). 

   Using a tester, measure the resistance between the auto headlight beam leveler Control Module connector and chassis ground.

   Connector & terminal

   (B150) No. 7 - Chassis ground:

   (B150) No. 9 - Chassis ground:

   Is the resistance 1 Ω or more?

   Yes:  Go to  5.

   No:  Repair or replace the short circuit of the harness.

5. CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY). 
   1. Turn the ignition switch to ON.
   2. Using a tester, measure the voltage between auto headlight beam leveler Control Module connector and chassis ground.

      Connector & terminal

      (B150) No. 7 (+) - Chassis ground (-):

      (B150) No. 9 (+) - Chassis ground (-):

      Is the voltage less than 1 V?

      Yes:  Go to  6.

      No:  Repair or replace the short circuit of the harness.

6. CHECK FORCED OPERATION OF SWIVEL ACTUATOR. 
   1. Turn the ignition switch to OFF.
   2. Connect all the disconnected connectors.
   3. Start the engine.
   4. Perform «Left Steering Responsive Headlight» using the Subaru Select Monitor. Refer to AUTO HEADLIGHT BEAM LEVELER SYSTEM (DIAGNOSTICS)>ACTIVE TEST .

      Is the actuator current position value approximately the same as the input value of the actuator control position?

      Yes:  Replace the auto headlight beam leveler Control Module. Refer to LIGHTING SYSTEM>AUTO HEADLIGHT BEAM LEVELER CONTROL MODULE .

      No:  Replace the headlight assembly LH. Refer to LIGHTING SYSTEM>HEADLIGHT ASSEMBLY .