DTC B2620: Electric Folding Mirror SW Anomalous State

DTC detecting condition: 

When extension SW-ON and retraction SW-ON status (= unidentified status) continues for 10 seconds.

Trouble symptom: 

The following functions do not operate.

• Manual electric retraction function
• Automatic electric retraction function

Wiring diagram: 

Remote control mirror system Ref. to WIRING SYSTEM>REMOTE CONTROL MIRROR SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .
   1. Turn the ignition switch to ON, and wait for 10 seconds or more.
   2. Read the DTC of [Door Mirror (Driver)] using the Subaru Select Monitor. Ref. to Door Mirror (Diagnostics)>Diagnostic Trouble Code (DTC) .

      Is DTC B2620 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  .
   1. Using the Subaru Select Monitor, perform the clear memory of [Door Mirror (Driver)]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   2. Turn the ignition switch to OFF.
   3. Disconnect the outer mirror control module (driver's seat) connector, and reconnect it.
   4. Turn the ignition switch to ON.
   5. Press and hold the electric retraction switch (retraction) and wait for 10 seconds or more.
   6. Release the electric retraction switch (extension) and wait for 10 seconds or more.
   7. Read the DTC of [Door Mirror (Driver)] using the Subaru Select Monitor. Ref. to Door Mirror (Diagnostics)>Diagnostic Trouble Code (DTC) .

      Is DTC B2620 displayed? (Current malfunction)

      Yes  : Go to  3 .

      No  : Repair or replace the poor contact of connector.

3. CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY)  .
   1. Turn the ignition switch to OFF.
   2. Disconnect the outer mirror control module (driver's seat) connector.
   3. Disconnect the remote control mirror switch connector.
   4. Turn the ignition switch to ON.
   5. Using a tester, measure the voltage between outer mirror control module (driver's seat) connector and chassis ground.

      Connector and terminal 

      (Df22) No. 1 (+) - Chassis ground (-):

      (Df22) No. 10 (+) - Chassis ground (-):

      Is the voltage less than 1 V?

      Yes  : Go to  4 .

      No  : Repair the short circuit to power supply in harness between outer mirror control module (driver's seat) connector and remote control mirror switch connector.

4. CHECK REMOTE CONTROL MIRROR SWITCH  .
   1. Turn the ignition switch to OFF.
   2. Check remote control mirror switch unit. Ref. to GLASS/WINDOW/MIRRORS>REMOTE CONTROL MIRROR SWITCH .

      Is the remote control mirror switch OK?

      Yes  : Go to  5 .

      No  : Replace the remote control mirror switch. Ref. to GLASS/WINDOW/MIRRORS>REMOTE CONTROL MIRROR SWITCH .

5. CHECK OUTER MIRROR CONTROL MODULE (DRIVER'S SEAT)  .

   Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Door Mirror (Driver)]. Ref. to Door Mirror (Diagnostics)>Data Monitor .

   • DMIR SW Input Status

   Does the input value change corresponding to the switch operation?

   Yes  : 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.

   No  : Replace the outer mirror control module (driver's seat). Ref. to GLASS/WINDOW/MIRRORS>OUTER MIRROR CONTROL MODULE .