Part 1

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM (w/o Smart Key System): Short to GND in CAN Bus Line
- Short to GND in CAN Bus Line

DESCRIPTION

There may be a short circuit between the CAN bus lines and GND when the resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 200 Ohms.





* *: w/ Navigation System

WIRING DIAGRAM









INSPECTION PROCEDURE

HINT
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

NEXT -- Continue to next step.

2. CHECK FOR SHORT TO GND IN CAN BUS WIRE (DLC3 CAN BRANCH WIRE)

(a) Disconnect the D55 No. 2 junction connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)
OK -- Continue to next step.

3. CONNECT CONNECTOR

(a) Reconnect the D55 No. 2 junction connector.

NEXT -- Continue to next step.

4. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)

(a) Disconnect the D59 No. 1 junction connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

5. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)

(a) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

6. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - BUS BUFFER ECU)

(a) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

7. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

8. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

9. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NAVIGATION RECEIVER ASSEMBLY)

NOTICE:
For vehicles without a navigation system, go to "Check for Short to GND in CAN Bus Wire (No. 1 Junction Connector - Hybrid Vehicle Control ECU)".

(a) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

10. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - HYBRID VEHICLE CONTROL ECU)

(a) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- CONNECT CONNECTOR

OK -- REPLACE NO. 1 JUNCTION CONNECTOR

11. CONNECT CONNECTOR

(a) Reconnect the D59 No. 1 junction connector.

NEXT -- Continue to next step.

12. CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM)

(a) Disconnect the A67 ECM connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ECM (CANH, CANL)

OK -- REPLACE ECM Removal

13. CONNECT CONNECTOR

(a) Reconnect the D59 No. 1 junction connector.

NEXT -- Continue to next step.

14. CHECK FOR SHORT TO GND IN CAN BUS WIRE (BUS BUFFER ECU)

(a) Disconnect the D50 bus buffer ECU (accessory gateway) connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO BUS BUFFER ECU (CAN+, CAN-)

OK -- REPLACE BUS BUFFER ECU (ACCESSORY GATEWAY)

15. CONNECT CONNECTOR

(a) Reconnect the D59 No. 1 junction connector.

NEXT -- Continue to next step.

16. CHECK FOR SHORT TO GND IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the D37 air conditioning amplifier assembly connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER ASSEMBLY (CANH, CANL)

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

17. CONNECT CONNECTOR

(a) Reconnect the D59 No. 1 junction connector.

NEXT -- Continue to next step.

18. CHECK FOR SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU ASSEMBLY)

(a) Disconnect the A44 skid control ECU assembly connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO SKID CONTROL ECU ASSEMBLY (CA1H, CA1L)

OK -- REPLACE SKID CONTROL ECU ASSEMBLY Removal

19. CONNECT CONNECTOR

(a) Reconnect the D59 No. 1 junction connector.

NEXT -- Continue to next step.

20. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NAVIGATION RECEIVER ASSEMBLY)

(a) Disconnect the E25 navigation receiver assembly connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO NAVIGATION RECEIVER ASSEMBLY (CANH, CANL)

OK -- REPLACE NAVIGATION RECEIVER ASSEMBLY Removal

21. CONNECT CONNECTOR

(a) Reconnect the D59 No. 1 junction connector.

NEXT -- Continue to next step.

22. CHECK FOR SHORT TO GND IN CAN BUS WIRE (HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the D73 hybrid vehicle control ECU connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO HYBRID VEHICLE CONTROL ECU (CA1H, CA1L)

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Removal