Check Seat Heater Switch Illumination (Front)

1. Disconnect the connector of seat heater switch.
2. Apply battery voltage between seat heater switch terminals.
   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 & terminal 

   No. 6 (+) - No. 5 (-):

   Courtesy of SUBARU OF AMERICA, INC.

   Do the illuminations come on?

   Yes:  Go to  2.

   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 .

1. Turn the ignition switch to ON.
2. Measure the voltage between harness connector terminal and chassis ground.

   Connector & terminal 

   (AD27) No. 6 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes:  Go to  3.

   No:  Repair or replace the harness.

Measure the resistance between harness connector terminal and chassis ground.

Connector & terminal 

(AD27) No. 5 - Chassis ground:

Is the resistance less than 10 Ω?

Yes:  Check the connector for temporary poor contact.

No:  Repair the harness.