DTC B2634: Mirror D SW Illumination Circuit Anomalous State

DTC detecting condition:

When the electric retraction SW illumination driver circuit detects overcurrent (8 A or more).
When the electric retraction SW illumination driver circuit detects overheat.
When a communication (ECM internal signal) error in the electric retraction SW illumination driver circuit is detected.
Trouble symptom:

The following functions do not operate.
Remote control mirror switch light illumination

Wiring diagram:

Clearance light and illumination light system Ref. to WIRING SYSTEM>CLEARANCE LIGHT AND ILLUMINATION LIGHT SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to DOOR MIRROR (DIAGNOSTICS)>General Description>INSPECTION .

CHECK DTC .
1. Turn the ignition switch to ON.
2. Read the DTC of [Door Mirror (Driver)] using the Subaru Select Monitor. Ref. to Door Mirror (Diagnostics)>Diagnostic Trouble Code (DTC) .
  Is DTC B2634 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.
CHECK REMOTE CONTROL MIRROR SWITCH .
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 3 .

No : Replace the remote control mirror switch. Ref. to GLASS/WINDOW/MIRRORS>REMOTE CONTROL MIRROR SWITCH .
CHECK COMBINATION METER .
Check the combination meter. Ref. to COMBINATION METER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

Is the combination meter OK?

Yes : Go to 4 .

No : Replace the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .
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. 13 (+) - Chassis ground (-):
  
  Is the voltage less than 1 V?
  
  Yes : Go to 5 .
  
  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.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Using a tester, measure the resistance between outer mirror control module (driver's seat) connector and chassis ground.
  Connector and terminal
  
  (Df22) No. 13 - Chassis ground:
  
  Is the resistance 1 MΩ or more?
  
  Yes : Replace the outer mirror control module (driver's seat). Ref. to GLASS/WINDOW/MIRRORS>OUTER MIRROR CONTROL MODULE .
  
  No : Repair the short circuit to ground in harness between outer mirror control module (driver's seat) connector and remote control mirror switch connector.