DESCRIPTION
There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 15 (CA5H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 16 (CA5L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
Detection Item |
Trouble Area |
---|---|
No resistance exists between terminal 15 (CA5H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 16 (CA5L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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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.
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HINT:
PROCEDURE
1. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 6 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the No. 6 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. 6 CAN Junction Connector) |
*b |
to Clearance Warning ECU Assembly (w/ Intuitive Parking Assist System) |
*c |
to Central Gateway ECU (Network Gateway ECU) |
*d |
to No. 5 CAN Junction Connector |
*e |
to Forward Recognition Camera (w/ Toyota Safety Sense P) |
- |
- |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
J22-1 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Clearance warning ECU assembly*1 |
J22-12 (CANL) - D4-4 (CG) |
|||
J22-2 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
J22-13 (CANL) - D4-4 (CG) |
|||
J22-3 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 5 CAN junction connector |
J22-14 (CANL) - D4-4 (CG) |
|||
J22-4 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Forward recognition camera*2 |
J22-15 (CANL) - D4-4 (CG) |
Result |
Proceed to |
---|---|
OK |
A |
NG (Central gateway ECU (network gateway ECU) CAN main line) |
B |
NG (No. 5 CAN junction connector CAN main line) |
C |
NG (ECU or sensor CAN branch lines) |
D |
A |
REPLACE NO. 6 CAN JUNCTION CONNECTOR |
C |
GO TO STEP 3 |
D |
GO TO STEP 6 |
|
2. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the N36 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. 6 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
J22-1 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
J22-12 (CANL) - D4-4 (CG) |
OK |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
3. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 5 CAN JUNCTION CONNECTOR) |
(a) Disconnect the No. 5 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. 5 CAN Junction Connector) |
*b |
to Millimeter Wave Radar Sensor Assembly (w/ Toyota Safety Sense P) |
*c |
to No. 6 CAN Junction Connector |
*d |
to No. 4 CAN Junction Connector |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
J21-1 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Millimeter wave radar sensor assembly*1 |
J21-3 (CANL) - D4-4 (CG) |
|||
J21-2 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 6 CAN junction connector |
J21-4 (CANL) - D4-4 (CG) |
|||
J21-6 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 4 CAN junction connector |
J21-7 (CANL) - D4-4 (CG) |
Result |
Proceed to |
---|---|
OK |
A |
NG (No. 4 CAN junction connector CAN main line) |
B |
NG (No. 6 CAN junction connector CAN main line) |
C |
NG (ECU or sensor CAN branch lines) |
D |
A |
REPLACE NO. 5 CAN JUNCTION CONNECTOR |
C |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR) |
D |
GO TO STEP 6 |
|
4. |
CHECK FOR SHORT TO GND 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 Central Gateway ECU (Network Gateway ECU) |
*c |
to No. 5 CAN Junction Connector |
*d |
to Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
J20-1 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
J20-3 (CANL) - D4-4 (CG) |
|||
J20-2 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 5 CAN junction connector |
J20-4 (CANL) - D4-4 (CG) |
|||
J20-6 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Blind spot monitor sensor LH*1 |
J20-7 (CANL) - D4-4 (CG) |
Result |
Proceed to |
---|---|
OK |
A |
NG (Central gateway ECU (network gateway ECU) CAN main line) |
B |
NG (No. 5 CAN junction connector CN main line) |
C |
NG (ECU or sensor CAN branch lines) |
D |
A |
REPLACE NO. 4 CAN JUNCTION CONNECTOR |
C |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 5 CAN JUNCTION CONNECTOR) |
D |
GO TO STEP 6 |
|
5. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
(a) Disconnect the N36 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. 4 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
J20-1 (CANH) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
J20-3 (CANL) - D4-4 (CG) |
OK |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
6. |
CHECK FOR SHORT TO GND IN CAN BUS LINES (ECU, SENSOR) |
(a) Reconnect the CAN junction connector. |
|
(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to GND is connected.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
N36-15 (CA5H) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
N36-16 (CA5L) - D4-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
HINT:
If the resistance changes to 200 Ω or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
OK |
REPLACE ECU OR SENSOR |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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• Brake status
• Vehicle speed
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HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptom
are listed in order of probability in the "Suspected Area" column of the
table. Check each sym ...
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1. CHECK DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Sliding Roof / Trouble Codes.
(e) Check the details of the DTC(s) (See page
).
2. CLEAR DTC
(a) Connect th ...