DTC B2608: Seat SW Failure

DTC detecting condition:

When the seat switch input is detected continuously for 10 seconds as ON on both directions.

Or when stuck ON condition (ON status continued for 20 seconds) is detected.

Trouble symptom:

Seat operation stops immediately in manual operation.

Wiring diagram:

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

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to POWER SEAT MEMORY SYSTEM (DIAGNOSTICS)>General Description>CAUTION .

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 System (Diagnostics)>Diagnostic Trouble Code (DTC) .
  Is DTC B2608 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 POWER SEAT CONTROL MODULE .
Using the Subaru Select Monitor, check the following items in the [Data monitor] of [Power Seat Memory]. Ref. to Power Seat Memory System (Diagnostics)>Data Monitor .
- Slide SW
- Reclining SW
- Lifter SW
- Tilt SW
Is [Abnormal] displayed in any of the switch statuses?

Yes : Replace the power seat switch. Ref. to SEATS>POWER SEAT SYSTEM .

No : Go to 3 .
CHECK DTC .
1. Using the Subaru Select Monitor, perform the clear memory of [Power Seat Memory]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
2. Turn the ignition switch to OFF.
3. Disconnect and then connect the power seat control module connector.
4. Turn the ignition switch to ON.
5. Move each axis using the power seat manual switch.
6. Read the DTC of [Power Seat Memory] using the Subaru Select Monitor. Ref. to Power Seat Memory System (Diagnostics)>Diagnostic Trouble Code (DTC) .
  Is DTC B2608 displayed? (Current malfunction)
  
  Yes : Go to 4 .
  
  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 HARNESS (GROUND SHORT CIRCUIT) .
1. Turn the ignition switch to OFF.
2. Disconnect the power seat control module connector.
3. Disconnect motor connectors.
4. Using a tester, measure the resistance between the power seat control module connector and chassis ground.
  Connector and terminal
  
  (St43) No. 17 - Chassis ground:
  
  Is the resistance 1 MΩ or more?
  
  Yes : Go to 5 .
  
  No : Repair or replace the short circuit to ground in harness between power seat control module connector and motor connector.
CHECK SLIDE SWITCH .
1. Disconnect the connector of power seat switch assembly.
2. Check the power seat switch assembly. Ref. to SEATS>POWER SEAT SYSTEM>INSPECTION>CHECK POWER SEAT SWITCH .
  Is the check result OK?
  
  Yes : Go to 6 .
  
  No : Replace the power seat switch. Ref. to SEATS>POWER SEAT SYSTEM .
CHECK HARNESS (SLIDE) .
1. Disconnect the power seat switch connector and slide motor connector.
2. Using a tester, measure the resistance between power seat switch connector and power seat control module connector.
  Connector and terminal
  
  (St43) No. 7 - (St52) No. 5: (slide forward)
  
  (St43) No. 18 - (St52) No. 6: (slide rearward)
  
  Is the resistance less than 10 Ω?
  
  Yes : Go to 7 .
  
  No : Check power seat harness.
CHECK TILT SWITCH .
1. Disconnect the connector of power seat switch assembly.
2. Check the power seat switch assembly. Ref. to SEATS>POWER SEAT SYSTEM>INSPECTION>CHECK POWER SEAT SWITCH .
  Is the check result OK?
  
  Yes : Go to 8 .
  
  No : Replace the power seat switch. Ref. to SEATS>POWER SEAT SYSTEM .
CHECK HARNESS (TILT) .
1. Disconnect the power seat switch connector and tilt motor connector.
2. Using a tester, measure the resistance between power seat switch connector and power seat control module connector.
  Connector and terminal
  
  (St43) No. 8 - (St52) No. 14: (tilt up)
  
  (St43) No. 19 - (St52) No. 15: (tilt down)
  
  Is the resistance less than 10 Ω?
  
  Yes : Go to 9 .
  
  No : Check power seat harness.
CHECK LIFTER SWITCH .
1. Disconnect the connector of power seat switch assembly.
2. Check the power seat switch assembly. Ref. to SEATS>POWER SEAT SYSTEM>INSPECTION>CHECK POWER SEAT SWITCH .
  Is the check result OK?
  
  Yes : Go to 10 .
  
  No : Replace the power seat switch. Ref. to SEATS>POWER SEAT SYSTEM .
CHECK HARNESS (LIFTER) .
1. Disconnect the power seat switch connector and lifter motor connector.
2. Using a tester, measure the resistance between power seat switch connector and power seat control module connector.
  Connector and terminal
  
  (St43) No. 10 - (St52) No. 7: (lifter up)
  
  (St43) No. 21 - (St52) No. 4: (lifter down)
  
  Is the resistance less than 10 Ω?
  
  Yes : Go to 11 .
  
  No : Check power seat harness.
CHECK RECLINING SWITCH .
1. Disconnect the connector of power seat switch assembly.
2. Check the power seat switch assembly. Ref. to SEATS>POWER SEAT SYSTEM>INSPECTION>CHECK POWER SEAT SWITCH .
  Is the check result OK?
  
  Yes : Go to 12 .
  
  No : Replace the power seat switch. Ref. to SEATS>POWER SEAT SYSTEM .
CHECK HARNESS (RECLINING) .
1. Disconnect the power seat switch connector and reclining motor connector.
2. Using a tester, measure the resistance between power seat switch connector and power seat control module connector.
  Connector and terminal
  
  (St43) No. 9 - (St52) No. 3: (reclining forward)
  
  (St43) No. 20 - (St52) No. 8: (reclining rearward)
  
  Is the resistance less than 10 Ω?
  
  Yes : Replace the power seat control module. Ref. to SEATS>POWER SEAT SYSTEM .
  
  No : Check power seat harness.