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Blower Motor Does Not Rotate: 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 Does Not Rotate)
G08542770Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK FUSE. 
  1. Remove fuse No. 22, 27 and 28 from fuse & relay box.
  2. Check the condition of fuse.
 Is any fuse blown out? Replace the fuse. Go to step 2  .
2 CHECK POWER SUPPLY OF BLOWER MOTOR RELAY. 
  1. Turn the ignition switch to OFF.
  2. Remove the blower motor relay.
  3. Turn the ignition switch to ON.
  4. Use a tester to measure the voltage between the blower motor relay connector and chassis ground.

    Connector & terminal 

    (B386) No. 2 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Go to step 3  . Repair the open circuit of blower motor power supply line harness.
3 CHECK BLOWER MOTOR RELAY. 
  1. Turn the ignition switch to OFF.
  2. Connect the battery positive terminal to the blower motor relay terminal No. 2, and the negative terminal to No. 3.
  3. Using the tester, measure the resistance between terminals.

    Connector & terminal 

    (Relay) No. 1 - No. 4: 

 Is the resistance less than 1 Ω? Go to step 4  . Replace the blower motor relay.
4 CHECK HARNESS. 
  1. Remove the auto A/C control module.
  2. Measure the resistance between auto A/C control module and relay using a tester.

    Connector & terminal 

    (B386) No. 3 - (i88) No. 9: 

 Is the resistance less than 1 Ω? Go to step 5  . Repair or replace the harness.
5 CHECK BLOWER MOTOR POWER SUPPLY. 
  1. Install the blower motor relay and auto A/C control module.
  2. Turn the ignition switch to ON.
  3. Turn the blower fan switch to ON.
  4. Use a tester to measure the voltage between the blower motor and chassis ground.

    Connector & terminal 

    (B87) No. 2 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Go to step 6  . Repair or replace the harness between relay and the blower motor.
6 CHECK BLOWER MOTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from blower motor.
  3. Connect the battery positive terminal to the blower motor connector terminal No. 2, and the negative terminal to No. 1.
  4. Make sure the blower motor runs.
 Does the blower motor run? Go to step 7  . Replace the blower motor. < Refer to REMOVAL , Blower Motor. >
7 CHECK HARNESS. 
  1. Disconnect the power transistor connector.
  2. Disconnect the auto A/C control module connector.
  3. Using the tester, measure the resistance between terminals of harness.

    Connector & terminal 

    (B57) No. 1 - Chassis ground: 

    (B57) No. 2 - (i88) No. 40: 

    (B57) No. 3 - (B87) No. 1: 

    (B57) No. 4 - (B87) No. 2: 

    (B57) No. 4 - (B386) No. 4: 

 Is the resistance less than 1 Ω? Go to step 8  . Repair or replace the harness.
8 CHECK FAN CONTROL SIGNAL. 
  1. Connect the disconnected connectors.
  2. Turn the ignition switch to ON.
  3. Set the fan dial or fan switch to 1st - 7th.
  4. Measure the voltage between the power transistor and chassis ground using a tester.

    Connector & terminal 

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

 Is the voltage approx. 10 V at 1st and approx. 1 V at 7th? Replace the power transistor. < Refer to REMOVAL , Power Transistor (Auto A/C Model). > Go to step 9  .
9 CHECK FOR POOR CONTACT. 
Check poor contact of auto A/C control module connector.		 Is there poor contact of connector? Repair the connector. Replace the auto A/C control module. < Refer to REMOVAL , Control Unit (Auto A/C Model). >
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