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Blower Motor Turns Around Early: Wiring Diagram

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Air Conditioning System < Refer to appropriate SYSTEM WIRING DIAGRAM. >

Fig 1: Air Conditioning System - Wiring Diagram (Blower Motor Turns Around Early)
G08542770Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK BLOWER MOTOR CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the power transistor connector.
  3. Use a tester to measure the resistance between the power transistor connector and chassis ground.

    Connector & terminal 

    (B57) No. 3 - Chassis ground: 

 Is there continuity? Repair or replace the short circuit of the harness. Go to step 2  .
2 CHECK HARNESS. 
  1. Remove the auto A/C control module.
  2. Use a tester to measure the resistance between the power transistor connector and chassis ground.

    Connector & terminal 

    (B57) No. 2 - Chassis ground: 

 Is there continuity? Repair or replace the short circuit of the harness. Go to step 3  .
3 CHECK POWER TRANSISTOR. 
  1. Connect the disconnected connectors.
  2. Turn the ignition switch to ON.
  3. Use a tester to measure the voltage between the power transistor connector and chassis ground.

    Connector & terminal 

    (B57) No. 2 (+) - Chassis ground (-): 

 Is the voltage approx. 10 V when fan dial or fan switch is in 1st position, and approx. 1 V in 7th position? Replace the power transistor. < Refer to REMOVAL , Power Transistor (Auto A/C Model). > Go to step 4  .
4 CHECK AUTO A/C CONTROL MODULE. 
  1. Turn the fan dial or fan switch OFF.
  2. Disconnect the power transistor connector.
  3. Use a tester to measure the resistance between the power transistor connector and chassis ground.

    Connector & terminal 

    (B57) No. 2 - Chassis ground: 

 When turning the fan dial or fan switch from OFF to another position, does the resistance change? Replace the power transistor. < Refer to REMOVAL , Power Transistor (Auto A/C Model). > Replace the auto A/C control module. < Refer to REMOVAL , Control Unit (Auto A/C Model). >
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