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Bus "A" (Main-Can): Wiring Diagram

CAN communication system. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: CAN Communication System - Wiring Diagram
G08585504Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK FROM DATA LINK CONNECTOR. 
Using the tester, measure the resistance between terminals.
Connector & terminal 
(B40) No. 6 - Chassis ground: 
(B40) No. 14 - Chassis ground: 
Is the resistance 10 Ω or less? Check for ground short. Refer to GROUND SHORT INSPECTION (BUS "A" (MAIN-CAN)) . Go to step .
2 CHECK FROM DATA LINK CONNECTOR. 
  1. Turn the ignition switch to ON.
  2. Using the tester, measure the voltage between terminals.

    Connector & terminal 

    (B40) No. 6 - Chassis ground: 

    (B40) No. 14 - Chassis ground: 

Is the voltage 5 V or less? Go to step . Check for battery short. Refer to BATTERY SHORT INSPECTION (BUS "A" (MAIN-CAN)) .
3 CHECK FROM DATA LINK CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Using the tester, measure the resistance between terminals.

    Connector & terminal 

    (B40) No. 6 - No. 14: 

Is the resistance 55 Ω or less? Perform the inspection for the resistance of 55 Ω or less. Refer to 55 Ω OR LESS . Go to step .
4 CHECK FROM DATA LINK CONNECTOR. 
Using the tester, measure the resistance between terminals.
Connector & terminal 
(B40) No. 6 - No. 14: 
Is the resistance 65 Ω or more? Perform the inspection for the resistance of 65 Ω or more. Refer to 65 Ω OR MORE . A related line may be open. Perform the inspection for 56 - 64 Ω relevant to the detected DTC. Refer to LIST .