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Subaru Select Monitor: Inspection: 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.

Tire Pressure Monitoring System < Refer to Tire Pressure Monitoring System Wiring Diagram. >

Fig 1: Tire Pressure Monitoring System - Wiring Diagram (Communication Impossible)
G08571972Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK IGNITION SWITCH.  Is the ignition switch ON? Go to step 2  . Turn the ignition switch to ON, and select TPM mode using Subaru Select Monitor.
2 CHECK BATTERY.  Is the voltage 11 V or more? Go to step 3  . Charge or replace the battery.
3 CHECK BATTERY TERMINAL.  Is there poor contact at battery terminal? Repair or tighten the battery terminal. Go to step 4  .
4 CHECK SUBARU SELECT MONITOR COMMUNICATION. 
  1. Turn the ignition switch to ON.
  2. Using the Subaru Select Monitor, check whether communication to other systems can be executed normally.
 Is the system name displayed on Subaru Select Monitor? Go to step 8  . Go to step 5  .
5 CHECK SUBARU SELECT MONITOR COMMUNICATION. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the TPMS & keyless entry control module connector.
  3. Turn the ignition switch to ON.
  4. Check whether communication to other systems can be executed normally.
 Is the system name displayed on Subaru Select Monitor? Replace the TPMS & keyless entry control module. < Refer to TPMS & KEYLESS ENTRY CONTROL MODULE , REMOVAL, Tire Pressure Monitoring System. > Go to step 6  .
6 CHECK HARNESS CONNECTOR BETWEEN EACH CONTROL MODULE AND DATA LINK CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the TPMS & keyless entry control module.
  3. Measure the resistance between data link connector and chassis ground.

    Connector & terminal 

    (B40) No. 7 - Chassis ground: 

 Is the resistance 1 MΩ or more? Go to step 7  . Repair the harness and connector between each control module and data link connector.
7 CHECK OUTPUT SIGNAL TO TPMS & KEYLESS ENTRY CONTROL MODULE. 
  1. Turn the ignition switch to ON.
  2. Measure the voltage between TPMS & keyless entry control module and chassis ground.

    Connector & terminal 

    (B40) No. 7 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 8  . Repair the harness and connector between each control module and data link connector.
8 CHECK HARNESS CONNECTOR BETWEEN TPMS & KEYLESS ENTRY CONTROL MODULE AND DATA LINK CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between the TPMS & keyless entry control module connector and the data link connector.

    Connector & terminal 

    (R221) No. 12 - (B40) No. 7: 

 Is the resistance less than 0.5 Ω? Go to step 9  . Repair the harness and connector between TPMS & keyless entry control module and data link connector.
9 CHECK TPMS & KEYLESS ENTRY CONTROL MODULE CONNECTOR. 
Turn the ignition switch to OFF.		 Is TPMS & keyless entry control module connector inserted into the TPMS & keyless entry control module until it locks? Go to step 10  . Insert the TPMS & keyless entry control module connector into the TPMS & keyless entry control module.
10 CHECK POWER SUPPLY CIRCUIT. 
  1. Turn the ignition switch to ON.
  2. Measure the ignition power supply voltage between TPMS & keyless entry control module connector and chassis ground.

    Connector & terminal 

    (R221) No. 4 (+) - Chassis ground (-): 

 Is the voltage 10 - 15 V? Go to step 11  . Repair open circuit of the harness between TPMS & keyless entry control module and battery.
11 CHECK HARNESS CONNECTOR BETWEEN TPMS & KEYLESS ENTRY CONTROL MODULE AND CHASSIS GROUND. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the TPMS & keyless entry control module.
  3. Measure the resistance of harness between TPMS & keyless entry control module and chassis ground.

    Connector & terminal 

    (R221) No. 5 - Chassis ground: 

 Is the resistance less than 0.5 Ω? Go to step 12  . Repair open circuit of the harness of the TPMS & keyless entry control module.
12 CHECK POOR CONTACT OF CONNECTOR.  Is there poor contact of TPMS & keyless entry control module power supply, ground circuit and data link connector? Repair the connector. Replace the TPMS & keyless entry control module. < Refer to TPMS & KEYLESS ENTRY CONTROL MODULE , REMOVAL, Tire Pressure Monitoring System. >
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