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52 Ω Or Less

Wiring diagram: 

CAN communication system Ref. to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .

G12409878Courtesy of SUBARU OF AMERICA, INC.
G12409879Courtesy of SUBARU OF AMERICA, INC.
NOTE: When the bus line is measured, combined resistance of the end resistance (120 O) in ECM and the end resistance (120 O) in body integrated unit can be measured. The combined resistance is supposed to be more than 52 Ω and less than 62 Ω with the stabilizing circuit included. When the measured resistance value is 52 Ω or less, main wiring harness or related lines may be shorted, or combined resistance may have changed because resistance other than end resistance is created on the circuit.
  1. CHECK BETWEEN RELATED LINES AND MAIN WIRING HARNESS.
    1. Turn the ignition switch to OFF.
    2. Disconnect the steering angle sensor connector.
    3. Using the tester, measure the resistance between terminals.

      Connector & terminal

      (i74) No. 2 - (i74) No. 3:

    Is the resistance less than 10 Ω?

    Yes: Go to  2.

    No: Go to  3.

  2. CHECK MAIN WIRING HARNESS AND RELATED LINES.

    With a tester connected, disconnect control module connectors in order.

    NOTE: Disconnect the body integrated unit at the end.

    Connector & terminal

    (i74) No. 2 - (i74) No. 3:

    Is there any control module whose condition has changed from short state?

    Yes: Replace the control module whose resistance has changed. When the value changed at disconnecting the body integrated unit, replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit>REMOVAL .

    Go to  3.

    No: Repair or replace the short circuit of the harness between body integrated unit and ECM.

  3. CHECK CONTROL MODULE.
    1. Disconnect the connectors of ECM and body integrated unit.
    2. Using a tester, measure the resistance between control module terminals.

      Connector & terminal

      (B134) No. 24 - (B134) No. 25:

      (i171) No. 22 - (i171) No. 2:

    Is the resistance 114 - 126 Ω?

    Yes: Go to  4.

    No: Replace the control module whose end resistance value is out of the specified range.

  4. CHECK HARNESS.

    Using the tester, check the short circuit of each harness.

    Connector & terminal

    (i171) No. 22 - (i171) No. 2:

    Is the resistance 1 MΩ or more?

    Yes: CAN communication circuit is normal.

    No: Go to  5.

  5. CHECK CONTROL MODULE.

    With a tester connected, disconnect control modules in order.

    Connector & terminal

    (i171) No. 22 - (i171) No. 2:

    Are there any control modules whose resistance changed to 1 MΩ or more?

    Yes: Replace the control module that has changed.

    No: Repair or replace the harness part which has resistance component.

Wiring diagram: 

CAN communication system Ref. to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM .

G12409880Courtesy of SUBARU OF AMERICA, INC.
NOTE: When the bus line is measured, combined resistance of the end resistance (120 O) in body integrated unit and the end resistance (120 O) in combination meter can be measured. The combined resistance is supposed to be more than 52 Ω and less than 62 Ω with the stabilizing circuit included. When the measured resistance value is 52 Ω or less, main wiring harness or related lines may be shorted, or combined resistance may have changed because resistance other than end resistance is created on the circuit.
  1. CHECK BETWEEN RELATED LINES AND MAIN WIRING HARNESS.
    1. Turn the ignition switch to OFF.
    2. Disconnect the impact sensor connector.
    3. Using the tester, measure the resistance between terminals.

      Connector & terminal

      (i188) No. 5 - (i188) No. 6:

    Is the resistance less than 10 Ω?

    Yes: Go to  2.

    No: Go to  3.

  2. CHECK MAIN WIRING HARNESS AND RELATED LINES.

    With a tester connected, disconnect control module connectors in order.

    NOTE: Disconnect the body integrated unit at the end.

    Connector & terminal

    (i188) No. 5 - (i188) No. 6:

    Is there any control module whose condition has changed from short state?

    Yes: Replace the control module whose resistance has changed. When the value changed at disconnecting the body integrated unit, replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit>REMOVAL .

    Go to  3.

    No: Repair or replace the short circuit of the harness between body integrated unit and combination meter.

  3. CHECK CONTROL MODULE.
    1. Disconnect the connectors of the body integrated unit and combination meter.
    2. Using a tester, measure the resistance between control module terminals.

      Connector & terminal

      (B281) No. 15 - (B281) No. 31:

      (i10) No. 6 - (i10) No. 7:

    Is the resistance 114 - 126 Ω?

    Yes: Go to  4.

    No: Replace the control module whose end resistance value is out of the specified range.

  4. CHECK HARNESS.

    Using the tester, check the short circuit of each harness.

    Connector & terminal

    (i10) No. 6 - (i10) No. 7:

    Is the resistance 1 MΩ or more?

    Yes: CAN communication circuit is normal.

    No: Go to  5.

  5. CHECK CONTROL MODULE.

    With a tester connected, disconnect control modules in order.

    Connector & terminal

    (i10) No. 6 - (i10) No. 7:

    Are there any control modules whose resistance changed to 1 MΩ or more?

    Yes: Replace the control module that has changed.

    No: Repair or replace the harness part which has resistance component.

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