CAN Communication Circuit Check: Procedure: Wiring Diagram

WARNING: This page is about a different car, the 2014 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

CAN communication system < Ref. to WIRING DIAGRAM , CAN Communication System. >

Non-turbo model

Fig 1: CAN Communication Wiring Diagram (Non-Turbo Model)
Courtesy of SUBARU OF AMERICA, INC.
Turbo model

Fig 2: CAN Communication Wiring Diagram (Turbo Model)
Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK BASIC DIAGNOSTIC PROCEDURE . Check if the basic diagnostic procedure was performed up to STEP 3. NOTE: The above-mentioned step can easily narrow down a fault part by the inspection with SSM, before performing "Inspection of CAN communication circuit" using a circuit tester.	Was the basic diagnostic procedure performed?	Go to step 2 .	Perform the basic diagnostic procedure. < Ref. to PROCEDURE , Basic Diagnostic Procedure. >
2 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. < Ref. to GROUND SHORT INSPECTION , INSPECTION, CAN Communication Circuit Check. >	Go to step 3 .
3 CHECK FROM DATA LINK CONNECTOR . Turn the ignition switch to ON. 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 4 .	Check for battery short. < Ref. to BATTERY SHORT INSPECTION , INSPECTION, CAN Communication Circuit Check. >
4 CHECK FROM DATA LINK CONNECTOR . Turn the ignition switch to OFF. Using the tester, measure the resistance between terminals. Connector & terminal (B40) No. 6 - No. 14:	Is the resistance 52 Ω or less?	Perform the inspection for the resistance of 52 Ω or less. < Ref. to 52 Ω OR LESS , INSPECTION, CAN Communication Circuit Check. >	Go to step 5 .
5 CHECK FROM DATA LINK CONNECTOR . Using the tester, measure the resistance between terminals. Connector & terminal (B40) No. 6 - No. 14:	Is the resistance 62 Ω or more?	Perform the inspection for the resistance of 62 Ω or more. < Ref. to 62 Ω OR MORE , INSPECTION, CAN Communication Circuit Check. >	If the display of CAN system U-code disappears from the current malfunction, the CAN network is currently normal. If the U-code has detected as current malfunction, related lines may be open. Perform the inspection for the related line corresponding to the detected DTC. < Ref. to LIST , CAN Communication Circuit Check. >