Check Seat Heater Switch Illumination (Rear)

CHECK SEAT HEATER SWITCH .
Apply battery voltage between the adapter harness terminals, and then perform inspection.

CAUTION: When applying battery voltage, do not mix up the positive (+) side and the negative (-) side. Incorrect polarity connection may cause LED damage inside the switch.

Connector and terminal

(AD68) No. 11 (+) - (AD68) No. 10 (-):

Do the illuminations come on?

Yes : The switch is normal. Check the connector for temporary poor contact.

No : Go to 2 .
CHECK ADAPTER HARNESS .
1. Remove the seat heater switch. Ref. to SEATS>Seat Heater System>REMOVAL>SEAT HEATER SWITCH>REAR SEAT HEATER SWITCH .
2. Check the continuity between the adapter harness connectors.
  Connector and terminal
  
  (AD68) No. 11 - (AD69) No. 6:
  
  (AD68) No. 11 - (AD70) No. 4:
  
  (AD68) No. 10 - (AD69) No. 7:
  
  (AD68) No. 10 - (AD70) No. 5:
Is there continuity between the terminals?

Yes : Go to 3 .

No : If no continuity exists, replace the adapter harness.
CHECK SEAT HEATER SWITCH UNIT .
Apply battery voltage between seat heater switch terminals, and perform the inspection.

CAUTION: When applying battery voltage, do not mix up the positive (+) side and the negative (-) side. Incorrect polarity connection may cause LED damage inside the switch.

Connector and terminal

LH side:

No. 6 (+) - No. 7 (-):

RH side:

No. 4 (+) - No. 5 (-):

Courtesy of SUBARU OF AMERICA, INC.

Do the illuminations come on?

Yes : Go to 4 .

No : If the indicator does not illuminate, replace the seat heater switch with a new part. Ref. to SEATS>Seat Heater System>REMOVAL>SEAT HEATER SWITCH .
CHECK POWER SUPPLY CIRCUIT .
1. Turn the ignition switch to ON.
2. Measure the voltage between harness connector terminal and chassis ground.
  Connector and terminal
  
  (R138) No. 11 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes : Go to 5 .

No : Repair or replace the harness.
CHECK GROUND CIRCUIT .
Measure the resistance between harness connector terminal and chassis ground.

Connector and terminal

(R138) No. 10 - Chassis ground:

Is the resistance less than 10 Ω?

Yes : Check the connector for temporary poor contact.

No : Repair the harness.