- Bus 2 CAN main wire or connector
- Bus 2 CAN branch wire or connector
- ECM
- Combination meter assembly
- Central gateway ECU (network gateway ECU)
- No. 5 junction connector
- No. 6 junction connector
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000018DN5 |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM: Open in Bus 2 Main Bus Line; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
Open in Bus 2 Main Bus Line |
DESCRIPTION
There may be an open circuit in one of the bus 2 main lines and/or a central gateway ECU (network gateway ECU) CAN branch wire when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher
|
Detection Item |
Trouble Area |
|---|---|
|
Resistance between terminals 18 (CA4H) and 17 (CA4L) of central gateway ECU (network gateway ECU) is 70 Ω or higher. |
|
This malfunction is not related to the lines of a bus 2 branch except the central gateway ECU (network gateway ECU) CAN branch wires or to ECUs or sensors connected a bus 2 branch.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
-
Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.
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![2018 - 2020 MY Sienna [11/2017 - ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
- Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
-
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notice before proceeding with work.
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-
Some parts must be initialized and set when replacing or removing and installing parts.
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-
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
-
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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-
Before replacing the ECM, refer to Registration.
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HINT:
- Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
- When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
|
1. |
CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER ASSEMBLY - NO. 5 JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
|
(b) Disconnect the combination meter assembly connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D145-17 (CANH) - D145-16 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
| OK |
|
|
|
2. |
CONNECT CONNECTOR |
(a) Reconnect the D145 combination meter assembly connector.
|
|
3. |
CHECK FOR OPEN IN CAN BUS WIRE (ECM - NO. 6 JUNCTION CONNECTOR) |
|
(a) Disconnect the ECM connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A69-13 (CANH) - A69-26 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
| OK |
|
|
|
4. |
CONNECT CONNECTOR |
(a) Reconnect the A69 ECM connector.
|
|
5. |
CHECK FOR OPEN IN CAN BUS WIRE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 5 JUNCTION CONNECTOR) |
|
(a) Disconnect the central gateway ECU (network gateway ECU) connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D202-18 (CA4H) - D202-17 (CA4L) |
Cable disconnected from negative (-) battery terminal |
54 to 69 Ω |
| OK |
|
|
|
6. |
CONNECT CONNECTOR |
(a) Reconnect the D202 central gateway ECU (network gateway ECU) connector.
|
|
7. |
CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR) |
(a) Disconnect the No. 5 junction connector.
|
*a |
Front view of wire harness connector (No. 5 Junction Connector) |
*b |
to No. 6 Junction Connector |
|
*c |
to Combination Meter Assembly |
*d |
to Central Gateway ECU (Network Gateway ECU) |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connect to |
|---|---|---|---|
|
D179-8 (CANH) - D179-19 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
No. 6 junction connector |
|
D179-7 (CANH) - D179-18 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
Combination meter assembly |
|
D179-5 (CANH) - D179-16 (CANL) |
Cable disconnected from negative (-) battery terminal |
54 to 69 Ω |
Central gateway ECU (network gateway ECU) |
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Combination meter assembly CAN main wire) |
B |
|
NG (Central gateway ECU (network gateway ECU) CAN branch wire) |
C |
|
NG (No. 6 junction connector CAN main wire) |
D |
| A |
|
REPLACE NO. 5 CAN JUNCTION CONNECTOR |
| B |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) |
| C |
|
REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
|
|
8. |
CONNECT CONNECTOR |
(a) Reconnect the D179 No. 5 junction connector.
|
|
9. |
CHECK FOR OPEN IN CAN BUS WIRE (NO. 6 CAN JUNCTION CONNECTOR) |
(a) Disconnect the No. 6 junction connector.
|
*a |
Front view of wire harness connector (to No. 6 Junction Connector) |
*b |
to No. 5 Junction Connector |
|
*c |
to ECM |
- |
- |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connect to |
|---|---|---|---|
|
D180-1 (CANH) - D180-12 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
No. 5 junction connector |
|
D180-7 (CANH) - D180-18 (CANL) |
Cable disconnected from negative (-) battery terminal |
108 to 132 Ω |
ECM |
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (ECM CAN main wire) |
B |
|
NG (No. 5 junction connector CAN main wire) |
C |
| A |
|
REPLACE NO. 6 JUNCTION CONNECTOR |
| B |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - ECM) |
| C |
|
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR) |
|
|