DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no resistance exists between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
Symptom |
Trouble Area |
---|---|
No resistance exists between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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DTC check procedure: Turn the blind spot monitor system on using the blind spot monitor main switch (ON/OFF switch), turn the cruise control main switch on, turn the LDA main switch on and then drive the vehicle at a speed of 60 km/h (37 mph) or more for approximately 5 minutes or more.
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HINT:
PROCEDURE
1. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 5 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 5 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. 5 CAN Junction Connector) |
*b |
to No. 4 CAN Junction Connector |
*c |
to Central Gateway ECU (Network Gateway ECU) |
*d |
to Occupant Detection ECU (w/ Occupant Detection ECU) |
*e |
to Brake Actuator Assembly |
- |
- |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
F124-1 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
No. 4 CAN junction connector |
F124-12 (CANL) - F41-16 (BAT) |
|||
F124-2 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
F124-13 (CANL) - F41-16 (BAT) |
|||
F124-4 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Occupant detection ECU*1 |
F124-15 (CANL) - F41-16 (BAT) |
|||
F124-5 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Brake actuator assembly |
F124-16 (CANL) - F41-16 (BAT) |
Result |
Proceed to |
---|---|
OK |
A |
NG (Line to central gateway ECU (network gateway ECU)) |
B |
NG (Line to No. 4 CAN junction connector) |
C |
NG (Line to ECU or sensor) |
D |
A | ![]() |
REPLACE NO. 5 CAN JUNCTION CONNECTOR |
C | ![]() |
GO TO STEP 3 |
D | ![]() |
GO TO STEP 4 |
|
2. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the F74 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. 5 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F124-2 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
F124-13 (CANL) - F41-16 (BAT) |
OK | ![]() |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG | ![]() |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
3. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR) |
(a) Disconnect the No. 4 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. 4 CAN Junction Connector) |
*b |
to Airbag Sensor Assembly |
*c |
to Steering Sensor |
*d |
to Power Steering ECU Assembly |
*e |
to No. 5 CAN Junction Connector |
- |
- |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
F123-1 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Airbag sensor assembly |
F123-12 (CANL) - F41-16 (BAT) |
|||
F123-5 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Steering sensor |
F123-16 (CANL) - F41-16 (BAT) |
|||
F123-6 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Power steering ECU assembly |
F123-17 (CANL) - F41-16 (BAT) |
|||
F123-7 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
No. 5 CAN junction connector |
F123-18 (CANL) - F41-16 (BAT) |
Result |
Proceed to |
---|---|
OK |
A |
NG (Line to No. 5 CAN junction connector) |
B |
NG (Line to ECU or sensor) |
C |
A | ![]() |
REPLACE NO. 4 CAN JUNCTION CONNECTOR |
B | ![]() |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR) |
C | ![]() |
GO TO STEP 4 |
4. |
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.
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(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 |
---|---|---|
F74-22 (CA2H) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
F74-7 (CA2L) - F41-16 (BAT) |
HINT:
OK | ![]() |
REPLACE ECU OR SENSOR |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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