Mirror Surface Moves Unexpectedly (Both Sides)

Trouble causes:

Short circuit to ground in harness
Outer mirror Control Module (driver's seat) malfunction
Power seat Control Module malfunction
TCM failure
Memory switch malfunction

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Refer to DOOR MIRROR (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

CHECK DTC .
1. Turn the ignition switch to ON, and wait for 20 seconds or more.
2. Using the Subaru Select Monitor, read the DTCs in [Door Mirror (Driver)], [Power Seat Memory] and [Transmission]. Refer to DOOR MIRROR (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to POWER SEAT MEMORY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC).
  - Door Mirror (Driver)
  - Power Seat Memory
  - Transmission
Are any DTCs displayed? (Current malfunction)

Yes : Perform the diagnosis for the displayed DTCs. Refer to DOOR MIRROR (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to POWER SEAT MEMORY (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Refer to TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC).

No : Go to 2.
CHECK PHENOMENON .
Check that the mirror surface position moves automatically linking with seat operation.

Does the mirror surface position move linking with seat operation?

Yes : Go to 3.

No : Go to 7.
CHECK CONNECTOR CONNECTION .
1. Turn the ignition switch to OFF.
2. Check that the following connectors are properly connected. Repair the connector if any broken pin or poor mating is detected.
  - Memory switch connector
  - Outer mirror Control Module (driver's seat) connector
3. Turn the ignition switch to ON.
4. Check that the faulty phenomenon is reproduced.
Is the faulty phenomenon reproduced?

Yes : Go to 4.

No : Since the poor contact of connector has repaired, the circuit condition returned to normal.
CHECK MEMORY SWITCH .
Check memory switch unit. Refer to SEATS>POWER SEAT SYSTEM .

Is the memory switch OK?

Yes : Go to 5.

No : Replace the memory switch. Refer to SEATS>POWER SEAT SYSTEM .
CHECK HARNESS (GROUND SHORT CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the outer mirror Control Module (driver's seat) connector.
3. Disconnect the memory switch connector.
4. Using a tester, measure the resistance between outer mirror Control Module (driver's seat) connector and chassis ground.
  Connector & terminal
  
  (Df21) No. 5 - Chassis ground:
  
  (Df21) No. 6 - Chassis ground:
Is the resistance 1 MΩ or more?

Yes : Go to 6.

No : Repair the short circuit to ground between outer mirror Control Module (driver's seat) connector and memory switch connector.
CHECK INPUT SIGNAL .
Using the Subaru Select Monitor, check the input signal on the [Data monitor] of [Door Mirror (Driver)]. Refer to DOOR MIRROR (DIAGNOSTIC)>DATA MONITOR .
- Memory SW1
- Memory SW2
Does the display change properly corresponding to the memory switch operation?

Yes : Perform the diagnosis for power seat Control Module. Refer to POWER SEAT MEMORY (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

No : Replace the outer mirror Control Module (driver's seat). Refer to GLASS/WINDOWS/MIRRORS>OUTER MIRROR Control Module .
CHECK INPUT SIGNAL .
Using the Subaru Select Monitor, check the input signal on the [Data monitor] of [Door Mirror (Driver)]. Refer to DOOR MIRROR (DIAGNOSTIC)>DATA MONITOR .
- Shift Position Signal
Does the display change correctly according to the select lever operation?

Yes : Replace the outer mirror Control Module (driver's seat) and check if any malfunction occurs. Refer to GLASS/WINDOWS/MIRRORS>OUTER MIRROR Control Module . If a malfunction occurs, replace the power seat Control Module. Refer to SEATS>POWER SEAT SYSTEM .

No : Perform the diagnosis for TCM. Refer to TRANSMISSION (DIAGNOSTICS)>Basic Diagnostic Procedure .