DTC B260A: Acc

DTC detecting condition: 

When there is a difference between ACC status sent via LIN communication and ACC status sent from direct line for 10 seconds or more continuously.

Trouble symptom: 

• Automatic electric retraction system does not extend. (When customizing ACC)
• While the electric retraction system is extended manually or automatically, mirrors stop halfway and do not fully extend. (When cranking)

Wiring diagram: 

Power seat system Ref. to WIRING SYSTEM>POWER SEAT SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .
   1. Turn the ignition switch to ON.
   2. Read the DTC of [Power Seat Memory] using the Subaru Select Monitor. Ref. to POWER SEAT MEMORY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC B260A displayed? (Current malfunction)

   Yes  : Go to  2 .

   No  : Go to  4 .

2. CHECK IG SIGNAL OF Power Seat & Remote Control Mirror Control Module  .

   Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Power Seat Memory]. Ref. to POWER SEAT MEMORY (DIAGNOSTICS)>DATA MONITOR .

   • LIN ACC signal

   When the ignition switch is turned to ON/OFF, are the following indications displayed?

   When the ignition switch is turned to ON: ON

   When the ignition switch is turned to OFF: OFF

   Yes  : Go to  3 .

   No  : Inspect the body integrated unit. Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

3. CHECK IG SIGNAL OF Power Seat & Remote Control Mirror Control Module  .

   Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Power Seat Memory]. Ref. to POWER SEAT MEMORY (DIAGNOSTICS)>DATA MONITOR .

   • ACC SW signal

   When the ignition switch is turned to ON/OFF, are the following indications displayed?

   When the ignition switch is turned to ON: ON

   When the ignition switch is turned to OFF: OFF

   Yes  : Go to  5 .

   No  : Go to 4.

4. CHECK HARNESS (OPEN CIRCUIT)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the Power Seat & Remote Control Mirror Control Module connector.
   3. Turn the ignition switch to ON.
   4. Using the tester, measure the voltage between power seat control module connector and chassis ground.

      Connector & terminal 

      (R502) No. 9 (+) - Chassis ground (-):

   Is the voltage 9.0 - 16 V?

   Yes  : Replace Power Seat & Remote Control Mirror Control Module. Ref. to SEATS>POWER SEAT SYSTEM .

   No  : Repair the open circuit in harness between power seat control module connector and fuse.

5. CHECK POOR CONTACT OF CONNECTORS  .
   1. Turn the ignition switch to OFF.
   2. Check for poor contact of Power Seat & Remote Control Mirror Control Module connector.

   Is the check result OK?

   Yes  : Repair or replace the poor contact of connector.

   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.