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Check Power Supply & Ground Circuit

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE CHART

Step Check Yes No
1 CHECK POWER SUPPLY. 
  1. Disconnect the harness connector of body integrated unit.
  2. Measure the voltage between body integrated unit connector and chassis ground.

    Connector & terminal 

    (i84) No. 34 (+) - Chassis ground (-): 

    (B280) No. 6 (+) - Chassis ground (-): 

    (B281) No. 2 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Go to step 2.  Check the harness for open or short circuit between body integrated unit and fuse.
2 CHECK GROUND CIRCUIT. 
Measure the resistance between body integrated unit connector and chassis ground.
Connector & terminal 
(i84) No. 28 - Chassis ground: 
(B280) No. 17 - Chassis ground: 
(B281) No. 20 - Chassis ground: 
(B279) No. 27 - Chassis ground: 		 Is the resistance less than 10 Ω? The power supply and ground circuit are OK. Repair or replace the harness.
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