DESCRIPTION
There may be a short circuit between one of the CAN bus lines and +B when no resistance exists 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 |
---|---|
No resistance exists 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
w/o Blind Spot Monitor System
w/ Blind Spot Monitor System
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 40 km/h (25 mph) or more for approximately 52 seconds or more.
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HINT:
PROCEDURE
1. |
CHECK VEHICLE TYPE |
(a) Check vehicle type.
Result |
Proceed to |
---|---|
w/o Blind Spot Monitor System |
A |
w/ Blind Spot Monitor System |
B |
B |
GO TO STEP 4 |
|
2. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the 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 Forward Recognition Camera (w/ Toyota Safety Sense P) |
*c |
to Millimeter Wave Radar Sensor Assembly (w/ Toyota Safety Sense P) |
*d |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
F112-2 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Forward recognition camera*1 |
F112-13 (CANL) - F41-16 (BAT) |
|||
F112-3 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Millimeter wave radar sensor assembly*1 |
F112-14 (CANL) - F41-16 (BAT) |
|||
F112-4 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
F112-15 (CANL) - F41-16 (BAT) |
|||
F112-5 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
F112-16 (CANL) - F41-16 (BAT) |
Result |
Proceed to |
---|---|
OK |
A |
NG (Line to central gateway ECU (network gateway ECU)) |
B |
NG (Line to ECU or sensor) |
C |
A |
REPLACE NO. 1 CAN JUNCTION CONNECTOR |
C |
GO TO STEP 8 |
|
3. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 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. 1 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F112-4 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
F112-15 (CANL) - F41-16 (BAT) |
||
F112-5 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
F112-16 (CANL) - F41-16 (BAT) |
OK |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
4. |
CHECK FOR SHORT TO +B 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 Central Gateway ECU (Network Gateway ECU) |
*c |
to Blind Spot Monitor Sensor LH |
*d |
to No. 1 CAN Junction Connector |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
M92-1 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
M92-12 (CANL) - F41-16 (BAT) |
|||
M92-6 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Blind spot monitor sensor LH |
M92-17 (CANL) - F41-16 (BAT) |
|||
M92-11 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
No. 1 CAN junction connector |
M92-22 (CANL) - F41-16 (BAT) |
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. 6 CAN JUNCTION CONNECTOR |
C |
GO TO STEP 6 |
D |
GO TO STEP 8 |
|
5. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 6 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. 6 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
M92-1 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
M92-12 (CANL) - F41-16 (BAT) |
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)) |
6. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR) |
(a) Disconnect the No. 1 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. 1 CAN Junction Connector) |
*b |
to Forward Recognition Camera (w/ Toyota Safety Sense P) |
*c |
to Millimeter Wave Radar Sensor Assembly (w/ Toyota Safety Sense P) |
*d |
to No. 6 CAN Junction Connector |
*e |
to Central Gateway ECU (Network Gateway ECU) |
- |
- |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
Connected to |
---|---|---|---|
F112-2 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Forward recognition camera*1 |
F112-13 (CANL) - F41-16 (BAT) |
|||
F112-3 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Millimeter wave radar sensor assembly*1 |
F112-14 (CANL) - F41-16 (BAT) |
|||
F112-4 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
No. 6 CAN junction connector |
F112-15 (CANL) - F41-16 (BAT) |
|||
F112-5 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
Central gateway ECU (network gateway ECU) |
F112-16 (CANL) - F41-16 (BAT) |
Result |
Proceed to |
---|---|
OK |
A |
NG (Line to central gateway ECU (network gateway ECU)) |
B |
NG (Line to No. 6 CAN junction connector) |
C |
NG (Line to ECU or sensor) |
D |
A |
REPLACE NO. 1 CAN JUNCTION CONNECTOR |
C |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR) |
D |
GO TO STEP 8 |
|
7. |
CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 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. 1 CAN Junction Connector) |
*b |
to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F112-5 (CANH) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
F112-16 (CANL) - F41-16 (BAT) |
OK |
REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) |
NG |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) |
8. |
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 |
---|---|---|
F74-23 (CA1H) - F41-16 (BAT) |
Cable disconnected from negative (-) battery terminal |
6 kΩ or higher |
F74-8 (CA1L) - F41-16 (BAT) |
HINT:
OK |
REPLACE ECU OR SENSOR |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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