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Check Power Supply And Ground Circuit

WARNING: This page is about a different car, the 2006 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
POWER SUPPLY REFERENCE CHART

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

    Connector & terminal 

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

 Is the measured value more than 10 V? Go to step 2.  Check the harness for open circuits or shorts between the integrated module and the fuse.
2 CHECK GROUND CIRCUIT. 
Measure the resistance between the harness connector terminal and chassis ground.
Connector & terminal 
(B281) No. 4, 13 - Chassis ground: 		 Is the measured value less than 10 Ω? The power supply and ground circuit is OK. Repair the harness.
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