DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CHECK CAN BUS WIRE (CHECK CAN MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE FOR SHORT)
CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)
CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - NO. 8 JUNCTION CONNECTOR)
CONNECT CONNECTOR
CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU)
CONNECT CONNECTOR
CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 8 JUNCTION CONNECTOR)
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - DRIVING SUPPORT SWITCH CONTROL ECU)
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)
CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 8 JUNCTION CONNECTOR)
CONNECT CONNECTOR
CHECK FOR SHORT IN CAN BUS WIRES (DRIVING SUPPORT SWITCH CONTROL ECU)
CONNECT CONNECTOR
CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)
CONNECT CONNECTOR
CHECK FOR SHORT IN CAN BUS WIRES (NO. 8 JUNCTION CONNECTOR)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)
DTC U1002 Lost Communication with Gateway Module (MS Bus) |
DESCRIPTION
- The main body ECU (multiplex network body ECU) stores this DTC when no signals can be received from the ECUs that have been memorized as those connected to the CAN MS bus.
- When the main body ECU (multiplex network body ECU) receives a response signal from the ECUs connected to the CAN MS bus, the main body ECU (multiplex network body ECU) recognizes and memorizes that the ECU is connected to the CAN MS bus. Based on this memorized data, the main body ECU (multiplex network body ECU) monitors for malfunctions in the ECUs connected to the CAN MS bus when communicating with those ECUs. If the main body ECU (multiplex network body ECU) cannot receive response signals from the ECUs that have been memorized as those connected to the CAN MS bus, the main body ECU (multiplex network body ECU) determines that a malfunction exists.
- If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [CAN branch wire]/CANL [CAN branch wire] of the ECU and/or sensor is open).
DTC Code
| DTC Detection Condition
| Trouble Area
|
U1002
| Lost communication with the gateway module.
| - MS bus circuit
- Main body ECU (multiplex network body ECU) CAN main wire or connector
- Driving support switch control ECU CAN branch wire or connector
- Main body ECU (multiplex network body ECU)
- Driving support switch control ECU
- No. 3 junction connector
- No. 8 junction connector
|
- For vehicles with a multi-function switch.
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
| 1.DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- CAUTION:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.
- NOTICE:
- After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (LandCruiser RM000003YMD00TX.html).
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
| 2.CHECK CAN BUS WIRE (CHECK CAN MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE FOR SHORT) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
| Resistance: Malfunction
|
G103-3 (CANP) - G103-2 (CANN)
| Ignition switch off
| 54 to 69 Ω
| Below 53 Ω: Short in line
|
G103-3 (CANP) - G103-2 (CANN)
| Ignition switch off
| 54 to 69 Ω
| Higher than 70 Ω: Open in CAN main bus line
|
G103-3 (CANP) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
| Below 6 kΩ: +B short
|
G103-2 (CANN) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
| Below 6 kΩ: +B short
|
G103-3 (CANP) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
| Below 200 Ω: Ground short
|
G103-2 (CANN) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
| Below 200 Ω: Ground short
|
Text in Illustration*a
| Component with harness connected
(No. 8 Junction Connector)
|
*b
| Front view of DLC3
|
ResultResult
| Proceed to
|
NG
- Open in CAN main bus line
| A
|
NG
- Short in line
- +B short
- GND short
| B
|
OK
| C
|
| 3.CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU) |
Disconnect the G96 No. 3 junction connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G96-4 (CANH) - G96-15 (CANL)
| Ignition switch off
| 108 to 132 Ω
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 3 Junction Connector)
|
| 4.CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - NO. 8 JUNCTION CONNECTOR) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G96-6 (CANH) - G96-17 (CANL)
| Ignition switch off
| 108 to 132 Ω
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 3 Junction Connector)
|
| OK |
|
|
|
| REPLACE NO. 3 JUNCTION CONNECTOR |
|
Reconnect the G96 No. 3 junction connector.
| 6.CHECK FOR OPEN IN CAN BUS MAIN WIRE (MAIN BODY ECU) |
Disconnect the G63 main body ECU (multiplex network body ECU) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G63-9 (CANP) - G63-10 (CANN)
| Ignition switch off
| 108 to 132 Ω
|
Text in Illustration*a
| Front view of wire harness connector
(to Main Body ECU [Multiplex Network Body ECU])
|
| | REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (MAIN BODY ECU - NO. 3 JUNCTION JUNCTION CONNECTOR) |
|
|
Reconnect the G96 No. 3 junction connector.
| 8.CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 8 JUNCTION CONNECTOR) |
Disconnect the G103 No. 8 junction connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G103-3 (CANP) - G103-2 (CANN)
| Ignition switch off
| 108 to 132 Ω
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 8 Junction Connector)
|
| | REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 8 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) |
|
|
| OK |
|
|
|
| REPLACE NO. 8 JUNCTION CONNECTOR |
|
| 9.CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - DRIVING SUPPORT SWITCH CONTROL ECU) |
Disconnect the G96 No. 3 junction connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G96-5 (CANH) - G96-16 (CANL)
| Ignition switch off
| 200 Ω or higher
|
G96-5 (CANH) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G96-16 (CANL) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G96-5 (CANH) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
G96-16 (CANL) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 3 Junction Connector)
|
*b
| Front view of DLC3
|
| 10.CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G96-4 (CANH) - G96-15 (CANL)
| Ignition switch off
| 108 to 132 Ω
|
G96-4 (CANH) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G96-15 (CANL) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G96-4 (CANH) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
G96-15 (CANL) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 3 Junction Connector)
|
*b
| Front view of DLC3
|
| 11.CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 8 JUNCTION CONNECTOR) |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G96-6 (CANH) - G96-17 (CANL)
| Ignition switch off
| 108 to 132 Ω
|
G96-6 (CANH) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G96-17 (CANL) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G96-6 (CANH) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
G96-17 (CANL) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 3 Junction Connector)
|
*b
| Front view of DLC3
|
| OK |
|
|
|
| REPLACE NO. 3 JUNCTION CONNECTOR |
|
Reconnect the G96 No. 3 junction connector.
| 13.CHECK FOR SHORT IN CAN BUS WIRES (DRIVING SUPPORT SWITCH CONTROL ECU) |
for Automatic Transmission:
Disconnect the G163 driving support switch control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G163-2 (CANP) - G163-3 (CANN)
| Ignition switch off
| 54 to 69 Ω
|
G163-2 (CANP) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G163-3 (CANN) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G163-2 (CANP) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
G163-3 (CANN) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Front view of wire harness connector
(to Driving Support Switch Control ECU)
|
*b
| Front view of DLC3
|
for Manual Transmission:
Disconnect the G76 driving support switch control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G76-9 (CANP) - G76-10 (CANN)
| Ignition switch off
| 54 to 69 Ω
|
G76-9 (CANP) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G76-10 (CANN) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G76-9 (CANP) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
G76-10 (CANN) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to Driving Support Switch Control ECU)
|
*b
| Front view of DLC3
|
| | REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DRIVING SUPPORT SWITCH CONTROL ECU (CANP, CANN) |
|
|
Reconnect the G96 No. 3 junction connector.
| 15.CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU) |
Disconnect the G63 main body ECU (multiplex network body ECU) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G63-9 (CANP) - G63-10 (CANN)
| Ignition switch off
| 108 to 132 Ω
|
G63-9 (CANP) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G63-10 (CANN) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G63-9 (CANP) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
G63-10 (CANN) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Front view of wire harness connector
(to Main Body ECU [Multiplex Network Body ECU])
|
*b
| Front view of DLC3
|
| | REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MAIN BODY ECU (CANP, CANN) |
|
|
Reconnect the G96 No. 3 junction connector.
| 17.CHECK FOR SHORT IN CAN BUS WIRES (NO. 8 JUNCTION CONNECTOR) |
Disconnect the G103 No. 8 junction connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
G103-3 (CANP) - G103-2 (CANN)
| Ignition switch off
| 108 to 132 Ω
|
G103-3 (CANP) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G103-2 (CANN) - G48-4 (CG)
| Ignition switch off
| 200 Ω or higher
|
G103-3 (CANP) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
G103-2 (CANN) - G48-16 (BAT)
| Ignition switch off
| 6 kΩ or higher
|
Text in Illustration*a
| Rear view of wire harness connector
(to No. 8 Junction Connector)
|
*b
| Front view of DLC3
|
| | REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 8 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) |
|
|
| OK |
|
|
|
| REPLACE NO. 8 JUNCTION CONNECTOR |
|
| 18.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND) |
Connect the cable to the negative (-) battery terminal.
- NOTICE:
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
Text in Illustration*a
| Rear view of wire harness connector
(to Main Body ECU [Multiplex Network Body ECU])
| *b
| Front view of wire harness connector
(to Main Body ECU [Multiplex Network Body ECU])
|
Remove the main body ECU (multiplex network body ECU) (LandCruiser RM000003WBO05FX.html).
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
G63-3 (GND2) - Body ground
| Always
| Below 1 Ω
|
A-11 (GND1) - Body ground
| Always
| Below 1 Ω
|
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
A-31 (ALTB) - Body ground
| Always
| 11 to 14 V
|
A-30 (BECU) - Body ground
| Always
| 11 to 14 V
|
A-29 (ACC) - Body ground
| Ignition switch ACC
| 11 to 14 V
|
A-32 (IG) - Body ground
| Ignition switch ON
| 11 to 14 V
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
