Short to B+ in CAN Bus Line

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Short to B+ in CAN Bus Line
- Short to B+ in CAN Bus Line

DESCRIPTION

There may be a short circuit between the CAN bus line and +B when there is resistance between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3.

HINT
*1: w/ Dynamic radar cruise control system

*2: w/ Navigation system

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
Turn the power switch off before measuring the resistances of the main wire and the branch wire.

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

PROCEDURE

1. CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 BRANCH WIRE)

(a) Disconnect the K86 CAN junction connector center connector.

(b) Measure the resistance of the DLC3.

Standard resistance:

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

2. CONNECT CONNECTOR

(a) Reconnect the K86 CAN junction connector center connector.

NEXT -- Continue to next step.

3. CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR RR SIDE)

(a) Disconnect the V37 CAN junction connector RR connector.

(b) Measure the resistance of the DLC3.

Standard resistance:

NG -- CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR RR - SEAT BELT CONTROL ECU)
OK -- Continue to next step.

4. CONNECT CONNECTOR

(a) Reconnect the V37 CAN junction connector RR connector.

NEXT -- Continue to next step.

5. CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR CENTER - NETWORK GATEWAY ECU)

(a) Disconnect the K84 CAN junction connector center connector.

(b) Measure the resistance of the DLC3.

Standard resistance:

OK -- CHECK CAN BUS LINE FOR SHORT TO +B (NETWORK GATEWAY ECU)
NG -- Continue to next step.

6. CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR CENTER - CLEARANCE WARNING ECU)

(a) Disconnect the K88 CAN junction connector center connector.

(b) Measure the resistance of the DLC3.

Standard resistance:

OK -- CHECK CAN BUS LINE FOR SHORT TO +B (CLEARANCE WARNING ECU)
NG -- Continue to next step.

7. CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR CENTER - DISTANCE CONTROL ECU)

NOTICE:
For vehicles without the dynamic radar cruise control system, go to "CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR CENTER - NAVIGATION ECU)".

(a) Disconnect the K85 CAN junction connector center connector.

(b) Measure the resistance of the DLC3.

Standard resistance:

OK -- CHECK CAN BUS LINE FOR SHORT TO +B (DISTANCE CONTROL ECU)
NG -- Continue to next step.

8. CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR CENTER - NAVIGATION ECU)

NOTICE:
For vehicles without the navigation system, go to "CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR CENTER - HYBRID VEHICLE CONTROL ECU)".

(a) Disconnect the K100 CAN junction connector center connector.

(b) Measure the resistance of the DLC3.

Standard resistance:

OK -- CHECK CAN BUS LINE FOR SHORT +B (NAVIGATION ECU)
NG -- Continue to next step.

9. CHECK CAN BUS LINE FOR SHORT TO +B (CAN JUNCTION CONNECTOR CENTER - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the K83 CAN junction connector center connector.

(b) Measure the resistance of the DLC3.

Standard resistance:

OK -- CHECK CAN BUS LINE FOR SHORT TO +B (HYBRID VEHICLE CONTROL ECU)

NG -- REPAIR OR REPLACE CAN JUNCTION CONNECTOR CENTER

10. CHECK CAN BUS LINE FOR SHORT TO +B (NETWORK GATEWAY ECU)

(a) Disconnect the K66 network gateway ECU connector.