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.
Symptom | Trouble Area |
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. |
- Short to ground in CAN main bus line
- Short to ground in CAN branch line
- Central gateway ECU (network gateway ECU)
- Outer mirror control ECU assembly LH
(w/ Seat Position Memory System)
- Outer mirror control ECU assembly RH
(w/ Seat Position Memory System)
- Headlight ECU sub-assembly RH
(w/ Cornering Light)
- Headlight ECU sub-assembly LH
(w/ Cornering Light)
- Position control ECU assembly LH
(w/ Seat Position Memory System)
- Certification ECU (smart key ECU assembly)
- Multiplex tilt and telescopic ECU
(w/ Power Tilt and Power Telescopic System)
- Meter mirror sub-assembly
(w/ Headup Display System)
- Main body ECU (multiplex network body ECU)
- Air conditioning amplifier assembly
- Combination meter assembly
- No. 3 CAN junction connector
- No. 6 CAN junction connector
- No. 2 junction connector
- No. 3 junction connector
| WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
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 GND IN CAN BUS LINE (NO. 3 CAN JUNCTION CONNECTOR) |
(a) Disconnect the cable from the negative (-) battery terminal. (b) Disconnect the G94 No. 3 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. 3 CAN Junction Connector) |
*b | to No. 3 Junction Connector |
*c | to Certification ECU (Smart Key ECU Assembly) |
*d | to Combination Meter Assembly |
*e | to Main Body ECU (Multiplex Network Body ECU) |
*f | to Air Conditioning Amplifier Assembly |
*g | to Headlight ECU sub-assembly LH
(w/ Cornering Light) |
*h | to Meter Mirror Sub-assembly
(w/ Headup Display System) |
*i | to Multiplex Tilt and Telescopic ECU
(w/ Power Tilt and Power Telescopic System) |
- | - |
Standard Resistance:
Tester Connection | Condition |
Specified Condition | Connected to |
G94-3 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 3 junction connector |
G94-14 (CANL) - G45-4 (CG) |
G94-4 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Certification ECU (smart key ECU assembly) |
G94-15 (CANL) - G45-4 (CG) |
G94-5 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Combination meter assembly |
G94-16 (CANL) - G45-4 (CG) |
G94-6 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Main body ECU (multiplex network body ECU) |
G94-17 (CANL) - G45-4 (CG) |
G94-7 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Air conditioning amplifier assembly |
G94-18 (CANL) - G45-4 (CG) |
G94-8 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Headlight ECU sub-assembly LH*1 |
G94-19 (CANL) - G45-4 (CG) |
G94-9 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Meter mirror sub-assembly*2 |
G94-20 (CANL) - G45-4 (CG) |
G94-10 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
to Multiplex tilt and telescopic ECU*3 |
G94-21 (CANL) - G45-4 (CG) |
- *1: w/ Cornering Light
- *2: w/ Headup Display System
- *3: w/ Power Tilt and Power Telescopic System
Result | Proceed to |
OK | A |
NG (Line to No. 3 junction connector) |
B | NG (Line to ECU or sensor) |
C |
A |
| REPLACE NO. 3 CAN JUNCTION CONNECTOR |
C |
| GO TO STEP 6 |
B |
| |
2. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 3 JUNCTION CONNECTOR) |
(a) Disconnect the K64 No. 3 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. 3 Junction Connector) |
*b | to Outer Mirror Control ECU Assembly LH
(w/ Seat Position Memory System) |
*c | to No. 3 CAN Junction Connector |
*d | to No. 2 Junction Connector |
Standard Resistance:
Tester Connection | Condition |
Specified Condition | Connected to |
K64-1 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Outer mirror control ECU assembly LH* |
K64-12 (CANL) - G45-4 (CG) |
K64-3 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 3 CAN junction connector |
K64-14 (CANL) - G45-4 (CG) |
K64-4 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 2 junction connector |
K64-15 (CANL) - G45-4 (CG) |
- *: w/ Seat Position Memory System
Result | Proceed to |
OK | A |
NG (Line to No. 3 CAN junction connector) |
B | NG (Line to No. 2 junction connector) |
C | NG (Line to ECU or sensor) |
D |
A |
| REPLACE NO. 3 JUNCTION CONNECTOR |
B |
| REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 3 CAN JUNCTION CONNECTOR) |
D |
| GO TO STEP 6 |
C |
| |
3. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 2 JUNCTION CONNECTOR) |
(a) Disconnect the K69 No. 2 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. 2 Junction Connector) |
*b | to No. 6 CAN Junction Connector |
*c | to No. 3 Junction Connector |
*d | to Position Control ECU Assembly LH
(w/ Seat Position Memory System) | Standard Resistance:
Tester Connection | Condition |
Specified Condition | Connected to |
K69-1 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 6 CAN junction connector |
K69-12 (CANL) - G45-4 (CG) |
K69-2 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 3 junction connector |
K69-13 (CANL) - G45-4 (CG) |
K69-3 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Position control ECU assembly LH* |
K69-14 (CANL) - G45-4 (CG) |
- *: w/ Seat Position Memory System
Result | Proceed to |
OK | A |
NG (Line to No. 3 junction connector) |
B | NG (Line to No. 6 CAN junction connector) |
C | NG (Line to ECU or sensor) |
D |
A |
| REPLACE NO. 2 JUNCTION CONNECTOR |
B |
| REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) |
D |
| GO TO STEP 6 |
C |
| |
4. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 6 CAN JUNCTION CONNECTOR) |
(a) Disconnect the K65 No. 6 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. 6 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
*c | to No. 2 Junction Connector |
*d | to Outer Mirror Control ECU Assembly RH
(w/ Seat Position Memory System) |
*e | to Headlight ECU Sub-assembly RH
(w/ Cornering Light) |
- | - |
Standard Resistance:
Tester Connection | Condition |
Specified Condition | Connected to |
K65-1 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Central gateway ECU (network gateway ECU) |
K65-12 (CANL) - G45-4 (CG) |
K65-2 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
No. 2 junction connector |
K65-13 (CANL) - G45-4 (CG) |
K65-3 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Outer mirror control ECU assembly RH*1 |
K65-14 (CANL) - G45-4 (CG) |
K65-5 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
Headlight ECU sub-assembly RH*2 |
K65-16 (CANL) - G45-4 (CG) |
- *1: w/ Seat Position Memory System
- *2: w/ Cornering Light
Result | Proceed to |
OK | A |
NG (Line to central gateway ECU (network gateway ECU)) |
B | NG (Line to No. 2 junction connector) |
C | NG (Line to ECU or sensor) |
D |
A |
| REPLACE NO. 6 CAN JUNCTION CONNECTOR |
C |
| REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) |
D |
| GO TO STEP 6 |
B |
| |
5. |
CHECK FOR SHORT TO GND IN CAN BUS LINE (NO. 6 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. 6 CAN Junction Connector) |
*b | to Central Gateway ECU (Network Gateway ECU) |
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
K65-1 (CANH) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
K65-12 (CANL) - G45-4 (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)) |
6. |
CHECK FOR SHORT TO GND 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 GND 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 |
G52-15 (CA5H) - G45-4 (CG) |
Cable disconnected from negative (-) battery terminal |
200 Ω or higher |
G52-16 (CA5L) - G45-4 (CG) |
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.
- If the resistance does not become normal when the connector is
disconnected from the ECU or sensor, check for a short to ground 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 | |