62 Ω Or More: Wiring diagram

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

Non-turbo model

Fig 1: CAN Communication System Wiring Diagram Non-Turbo Model (1 Of 2)

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: CAN Communication System Wiring Diagram Non-Turbo Model (2 Of 2)

Courtesy of SUBARU OF AMERICA, INC.

Fig 3: CAN Communication System Wiring Diagram Turbo Model (1 Of 2)

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Fig 4: CAN Communication System Wiring Diagram Turbo Model (2 Of 2)

Courtesy of SUBARU OF AMERICA, INC.

NOTE: When CAN communication circuit is measured, combined resistance of end resistance (120 Ω) in ECM and end resistance (120 Ω) in VDC Control Module can be measured. The combined resistance is approximately 53 - 61 Ω with the stabilizing circuit included. When the measured resistance value is 62 Ω or more, either one of the end resistances, or stabilizing circuit, or main wiring harness may have malfunction such as open circuit.

CHECK CONTROL MODULE.
1. Disconnect ECM and VDC Control Module connectors.
2. Using a tester, measure the resistance between control module terminals.
  Connector & terminal
  
  (B137) No. 19 - No. 18 (non-turbo model):
  
  (B134) No. 9 - No. 10 (turbo model):
  
  (B310) No. 2 - No. 15:
Is the resistance 114 - 126 Ω?
- Yes : Go to 2.
- No : Replace the control module whose value is out of the specification.
CHECK CONTROL MODULE.
1. Disconnect the connector of body control module.
2. Using a tester, measure the resistance between control module terminals.
  Connector & terminal
  
  (B281) No. 28 - (i84) No. 27:
  
  (B281) No. 20 - (i84) No. 35:
Is the resistance 2850 - 3150 Ω?
- Yes : Go to 3.
- No : Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit>REMOVAL .
CHECK CONTROL MODULE.
Using the tester, measure the resistance between terminals.

Connector & terminal

(B281) No. 28 - (i84) No. 35:

(B281) No. 20 - (i84) No. 27:

Is the resistance less than 1 Ω?
- Yes : Go to 4.
- No : Replace the body integrated unit. Ref. to SECURITY AND LOCKS>Body Integrated Unit>REMOVAL .
CHECK CONTROL MODULE.
1. Disconnect the combination meter connector.
2. Using a tester, measure the resistance between control module terminals.
  Connector & terminal
  
  (i10) No. 32 - No. 33:
Is the resistance 2850 - 3150 Ω?
- Yes : Go to 5.
- No : Replace the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>Combination Meter>REMOVAL .
CHECK CONTROL MODULE (ONLY FOR MODELS WITH HIGH GRADE MFD).
1. Disconnect the MFD connector.
2. Using a tester, measure the resistance between control module terminals.
  Connector & terminal
  
  (i122) No. 5 - No. 6:
Is the resistance 2850 - 3150 Ω?
- Yes : Go to 6.
- No : Replace the MFD. Ref. to INSTRUMENTATION/DRIVER INFO>Multifunction Display (MFD)>REMOVAL .
CHECK HARNESS.
Using a tester, check continuity between terminals.

Connector & terminal

(B40) No. 6 - (B137) No. 19 (non-turbo model):

(B40) No. 14 - (B137) No. 18 (non-turbo model):

(B40) No. 6 - (B134) No. 10 (turbo model):

(B40) No. 14 - (B134) No. 9 (turbo model):

(B40) No. 6 - (i84) No. 27:

(B40) No. 14 - (i84) No. 35:

Is there continuity?
- Yes : Go to 7.
- No : Repair or replace the open circuit of harness.
CHECK HARNESS.
Using a tester, check continuity between terminals.

Connector & terminal

(B281) No. 20 - (B310) No. 2:

(B281) No. 28 - (B310) No. 15:

Is there continuity?
- Yes : It is possible that temporary poor communication occurs.
- No : Repair or replace the open circuit of harness.