Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000Z14R
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 - 11/2017]
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Open in CAN Main Bus Line; 2017 MY Sienna [08/2016 - 11/2017]

Open in CAN Main Bus Line

DESCRIPTION

There may be an open circuit in the CAN main wire and/or DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.

Symptom

Trouble Area

Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is 70 Ω or higher.

  • CAN main wire and connector
  • No. 1 junction connector
  • No. 2 junction connector
  • ECM
  • Combination meter assembly
  • DLC3 branch wire or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

PRECAUTION

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (See page 2017 - 2020 MY Sienna [08/2016 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION ).

NEXT

2.

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the 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 (See page 2017 MY Sienna [08/2016 - 11/2017]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION ).

NEXT

3.

CHECK DLC3

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

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D16-6 (CANH) - D180-6 (CANH)

Ignition switch off

Below 1 Ω

D16-14 (CANL) - D180-17 (CANL)

Ignition switch off

Below 1 Ω

*a

Front view of DLC3

*b

Rear view of wire harness connector

(to No. 1 Junction Connector)

NG

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CAN-H, CAN-L)

OK

4.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - ECM)

*a

Rear view of wire harness connector

(to No. 1 Junction Connector)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D180-7 (CANH) - D180-18 (CANL)

Ignition switch off

108 to 132 Ω

NG

GO TO STEP 6

OK

5.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D180-1 (CANH) - D180-12 (CANL)

Ignition switch off

108 to 132 Ω

*a

Rear view of wire harness connector

(to No. 1 Junction Connector)

OK

REPLACE NO. 1 JUNCTION CONNECTOR

NG

GO TO STEP 8

6.

CONNECT CONNECTOR

(a) Reconnect the D180 No. 1 junction connector connector.

NEXT

7.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 1 JUNCTION CONNECTOR)

(a) Disconnect the ECM connector.

*a

Front view of wire harness connector

(to ECM)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A69-13 (CANH) - A69-26 (CANL)

Ignition switch off

108 to 132 Ω

OK

REPLACE ECM

NG

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 1 JUNCTION CONNECTOR)

8.

CONNECT CONNECTOR

(a) Reconnect the D180 No. 1 junction connector connector.

NEXT

9.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

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

*a

Rear view of wire harness connector

(to No. 2 Junction Connector)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D179-7 (CANH) - D179-18 (CANL)

Ignition switch off

108 to 132 Ω

NG

GO TO STEP 11

OK

10.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D179-8 (CANH) - D179-19 (CANL)

Ignition switch off

108 to 132 Ω

*a

Rear view of wire harness connector

(to No. 2 Junction Connector)

OK

REPLACE NO. 2 JUNCTION CONNECTOR

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

11.

CONNECT CONNECTOR

(a) Reconnect the D179 No. 2 junction connector connector.

NEXT

12.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER ASSEMBLY - NO. 2 JUNCTION CONNECTOR)

(a) Disconnect the combination meter assembly connector.

*a

Front view of wire harness connector

(to Combination Meter Assembly)

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D145-17 (CANH) - D145-16 (CANL)

Ignition switch off

108 to 132 Ω

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ASSEMBLY (COMBINATION METER ASSEMBLY - NO. 2 JUNCTION CONNECTOR)