- Short to +B in CAN main bus line
- Short to +B in CAN branch line
- Central gateway ECU (network gateway ECU)
- Forward recognition camera
- Millimeter wave radar sensor assembly
- Swing grille actuator assembly
- Blind spot monitor sensor RH
- Television camera assembly
-
Clearance warning ECU assembly
(w/ Intelligent Clearance Sonar System)
-
Parking assist ECU
(w/ Panoramic View Monitor System)
- Driving support ECU assembly
- No. 1 CAN junction connector
- No. 7 CAN junction connector
| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001ANCW |
| Model Year Start: 2019 | Model: Avalon HV | Prod Date Range: [04/2018 - 08/2021] |
| Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): Check Bus 1 Line for Short to +B; 2019 - 2021 MY Avalon HV [04/2018 - 08/2021] | ||
|
Check Bus 1 Line for Short to +B |
DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
|
Symptom |
Trouble Area |
|---|---|
|
There is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3. |
|
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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![2019 - 2022 MY Avalon HV [04/2018 - ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
- Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
-
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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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 power switch on (IG) 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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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 SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the A48 No. 1 CAN junction connector.
(c) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b |
to Millimeter Wave Radar Sensor Assembly |
|
*c |
to Forward Recognition Camera |
*d |
to Central Gateway ECU (Network Gateway ECU) |
|
*e |
to Swing Grille Actuator Assembly |
*f |
to No. 7 CAN Junction Connector |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
A48-1 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Millimeter wave radar sensor assembly |
|
A48-7 (CANL) - G45-16 (BAT) |
|||
|
A48-2 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Forward recognition camera |
|
A48-8 (CANL) - G45-16 (BAT) |
|||
|
A48-3 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
|
A48-9 (CANL) - G45-16 (BAT) |
|||
|
A48-4 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Swing grille actuator assembly |
|
A48-10 (CANL) - G45-16 (BAT) |
|||
|
A48-5 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
No. 7 CAN junction connector |
|
A48-11 (CANL) - G45-16 (BAT) |
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
|
NG (Line to No. 7 CAN junction connector) |
C |
|
NG (Line to ECU or sensor) |
D |
| A |
|
REPLACE NO. 1 CAN JUNCTION CONNECTOR |
| C |
|
| D |
|
|
|
2. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the G52 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A48-3 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
|
A48-9 (CANL) - G45-16 (BAT) |
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
|
3. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 7 CAN JUNCTION CONNECTOR) |
(a) Disconnect the K66 No. 7 CAN junction connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 7 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
|
*c |
to Clearance Warning ECU Assembly (w/ Intelligent Clearance Sonar System) |
*d |
to Blind Spot Monitor Sensor RH |
|
*e |
to Television Camera Assembly |
*f |
to No. 1 CAN Junction Connector |
|
*g |
to Parking Assist ECU (w/ Panoramic View Monitor System) |
*h |
to Driving Support ECU Assembly |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
Connected to |
|---|---|---|---|
|
K66-1 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
|
K66-11 (CANL) - G45-16 (BAT) |
|||
|
K66-2 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Clearance warning ECU assembly*1 |
|
K66-12 (CANL) - G45-16 (BAT) |
|||
|
K66-3 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Blind spot monitor sensor RH |
|
K66-13 (CANL) - G45-16 (BAT) |
|||
|
K66-4 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Television camera assembly |
|
K66-14 (CANL) - G45-16 (BAT) |
|||
|
K66-5 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
No. 1 CAN junction connector |
|
K66-15 (CANL) - G45-16 (BAT) |
|||
|
K66-8 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Parking assist ECU*2 |
|
K66-18 (CANL) - G45-16 (BAT) |
|||
|
K66-9 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
Driving support ECU assembly |
|
K66-19 (CANL) - G45-16 (BAT) |
- *1: w/ Intelligent Clearance Sonar System
- *2: w/ Panoramic View Monitor System
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (Line to central gateway ECU (network gateway ECU)) |
B |
|
NG (Line to No. 1 CAN junction connector) |
C |
|
NG (Line to ECU or sensor) |
D |
| A |
|
REPLACE NO. 7 CAN JUNCTION CONNECTOR |
| C |
|
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) |
| D |
|
|
|
4. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the G52 central gateway ECU (network gateway ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Front view of wire harness connector (to No. 7 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K66-1 (CANH) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
|
K66-11 (CANL) - G45-16 (BAT) |
| OK |
|
| NG |
|
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
|
5. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU OR SENSOR) |
(a) Reconnect all wire harness connectors.
(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B is connected.
Click here
(c) Measure the resistance according to the value(s) in the table below.
|
*1 |
DLC3 |
- |
- |
|
*a |
Component with harness connected (Central Gateway ECU (Network Gateway ECU)) |
- |
- |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G52-23 (CA1H) - G45-16 (BAT) |
Cable disconnected from negative (-) auxiliary battery terminal |
6 kΩ or higher |
|
G52-8 (CA1L) - G45-16 (BAT) |
HINT:
- If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
- If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to +B in the wire harness and repair or replace the wire harness or connector if necessary.
| OK |
|
REPLACE ECU OR SENSOR |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|