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Check Power Supply And Ground Circuit

WARNING: This page is about a different car, the 2005 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
POWER SUPPLY AND GROUND CIRCUIT

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

Connector & terminal 
(B176) No. 14, No. 15 (+) - Chassis ground (-): 		 Is the measured value more than 10 V? Go to step 2.  Check the harness for open circuits and shorts between the keyless entry control module and fuse.
2 CHECK GROUND CIRCUIT. 
Measure the resistance between the harness connector terminal and chassis ground.
Connector & terminal 
(B176) No. 11 - Chassis ground: 		 Is the measured value less than 10 Ω? The power supply and ground circuit are OK. Repair the harness.
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