DTC B2601: Lin Circuit Low

DTC detecting condition: 

LIN communication circuit with the body integrated unit is shorted for a certain period of time (4000 ms) or more.

Trouble symptom: 

Seat operation is possible with manual operation, but not with memory function.

Registration is possible with memory switch, but not with keyless access push button start system.

1. CHECK DTC. 
   1. Turn the ignition switch to ON.
   2. Read the DTC of the power seat control module using the Subaru Select Monitor. Ref. to POWER SEAT MEMORY SYSTEM (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is DTC B2601 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 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 DTC. 

   Read the DTC of body integrated unit using Subaru Select Monitor. Ref. to BODY CONTROL SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC U0208 displayed? (Current malfunction)

   Yes  Perform the diagnosis of DTC U0208. Ref. to BODY CONTROL SYSTEM (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0208 LOST COMMUNICATION WITH SEAT MEMORY .

   No  Go to  3 .

3. CHECK BODY INTEGRATED UNIT. 
   1. Turn the ignition switch to OFF.
   2. Replace with a power seat control module working properly. Ref. to SEATS>POWER SEAT System>REMOVAL>POWER SEAT CONTROL MODULE (SEAT WITH MEMORY FUNCTION) .
   3. Turn the ignition switch to ON.
   4. Read the DTC of the power seat control module using the Subaru Select Monitor. Ref. to POWER SEAT MEMORY SYSTEM (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is DTC B2601 displayed? (Current malfunction)

   Yes  Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

   No  There was an abnormality in power seat control module.