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Home >> Lexus >> 2017 >> GX 460 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (Diagnostic Codes & Symptom Tests) (1 Of 3) >> Can Communication System >> DTC U1002: Lost Communication with Gateway Module (Sensor Bus) [08/2015 - 08/2019] >> Procedure

DTC U1002: Lost Communication with Gateway Module (Sensor Bus) [08/2015 - 08/2019]: Procedure

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.

      NOTE:
      • w/ Navigation System:

        After the engine switch is turned off, the multi-media module receiver assembly records various types of memory and settings. As a result, after turning the engine switch off, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

        WAITING TIME BEFORE DISCONNECTING CABLE FROM NEGATIVE (-) BATTERY TERMINAL

        Condition Waiting Time
        Vehicle enrolled in safety connect system 6 minutes
        Vehicle not enrolled in safety connect system 1 minute
      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [08/2015 - 08/2019] ).

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR CAN BUS WIRE (CAN MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY633581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition resistance: Malfunction
      G43-40 (CA1P) - G43-18 (CA1N) Engine switch off 54 to 69 Ω Below 53 Ω: Short in line
      G43-40 (CA1P) - G43-18 (CA1N) Engine switch off 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      G43-40 (CA1P) - G37-16 (BAT) Engine switch off 6 kΩ or higher Below 6 kΩ: +B short
      G43-18 (CA1N) - G37-16 (BAT) Engine switch off 6 kΩ or higher Below 6 kΩ: +B short
      G43-40 (CA1P) - G37-4 (CG) Engine switch off 200 Ω or higher Below 200 Ω: Ground short
      G43-18 (CA1N) - G37-4 (CG) Engine switch off 200 Ω or higher Below 200 Ω: Ground short
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Driving Support ECU Assembly)
      RESULT

      Result Proceed to
      NG
      • Open in CAN main wire
      		 A
      NG
      • Short in line
      • +B short
      • Ground short
      		 B
      OK C

    Result: 

    B 

    See step  9

    Result: 

    C 

    See step  21

    Result: 

    A 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - DRIVING SUPPORT ECU ASSEMBLY) 
    1. Disconnect the G80 No. 3 junction connector.
      GTY646177Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G80-9 (CANH) - G80-20 (CANL) Engine switch off 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 3 Junction Connector)

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY656973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G80-11 (CANH) - G80-22 (CANL) Engine switch off 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 3 Junction Connector)

    Result: 

    OK 

    REPLACE NO. 3 JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  7

  5. CONNECT CONNECTOR 
    1. Reconnect the G80 No. 3 junction connector.

    Result: 

    NEXT 

    See step  6

  6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (DRIVING SUPPORT ECU ASSEMBLY - NO. 3 JUNCTION CONNECTOR) 
    1. Disconnect the G43 driving support ECU assembly connector.
      GTY658740Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G43-40 (CA1P) - G43-18 (CA1N) Engine switch off 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Driving Support ECU Assembly)

    Result: 

    OK 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO DRIVING SUPPORT ECU ASSEMBLY (DRIVING SUPPORT ECU ASSEMBLY - NO. 3 JUNCTION CONNECTOR) 

  7. CONNECT CONNECTOR 
    1. Reconnect the G80 No. 3 junction connector.

    Result: 

    NEXT 

    See step  8

  8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - NO. 3 JUNCTION CONNECTOR) 
    1. Disconnect the A12 millimeter wave radar sensor assembly connector.
      GTY618082Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      A12-4 (CA1P) - A12-3 (CA1N) Engine switch off 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Millimeter Wave Radar Sensor Assembly)

    Result: 

    OK 

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO MILLIMETER WAVE RADAR SENSOR (MILLIMETER WAVE RADAR SENSOR - NO. 3 JUNCTION CONNECTOR) 

  9. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - LANE RECOGNITION CAMERA SENSOR ASSEMBLY) 
    NOTE:

    For vehicles without a lane departure alert system, go to "Check for Short in CAN Bus Wires (No. 3 Junction Connector - Driver Monitor ECU Assembly)".

    1. Disconnect the G80 No. 3 junction connector.
      GTY682486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G80-10 (CANH) - G80-21 (CANL) Engine switch off 200 Ω or higher
      G80-10 (CANH) - G37-4 (CG) Engine switch off 200 Ω or higher
      G80-21 (CANL) - G37-4 (CG) Engine switch off 200 Ω or higher
      G80-10 (CANH) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      G80-21 (CANL) - G37-16 (BAT) Engine 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

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  10

  10. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - DRIVER MONITOR ECU ASSEMBLY) 
    NOTE:

    For vehicles without a driver monitor camera, go to "Check for Short in CAN Bus Wires (No. 3 Junction Connector - Millimeter Wave Radar Sensor Assembly)".

    1. Measure the resistance according to the value(s) in the table below.
      GTY619465Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G80-8 (CANH) - G80-19 (CANL) Engine switch off 200 Ω or higher
      G80-8 (CANH) - G37-4 (CG) Engine switch off 200 Ω or higher
      G80-19 (CANL) - G37-4 (CG) Engine switch off 200 Ω or higher
      G80-8 (CANH) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      G80-19 (CANL) - G37-16 (BAT) Engine 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

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  11

  11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY614952Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G80-11 (CANH) - G80-22 (CANL) Engine switch off 108 to 132 Ω
      G80-11 (CANH) - G37-4 (CG) Engine switch off 200 Ω or higher
      G80-22 (CANL) - G37-4 (CG) Engine switch off 200 Ω or higher
      G80-11 (CANH) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      G80-22 (CANL) - G37-16 (BAT) Engine 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

    Result: 

    NG 

    See step  17

    Result: 

    OK 

    See step  12

  12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - DRIVING SUPPORT ECU ASSEMBLY) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY682486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G80-9 (CANH) - G80-20 (CANL) Engine switch off 108 to 132 Ω
      G80-9 (CANH) - G37-4 (CG) Engine switch off 200 Ω or higher
      G80-20 (CANL) - G37-4 (CG) Engine switch off 200 Ω or higher
      G80-9 (CANH) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      G80-20 (CANL) - G37-16 (BAT) Engine 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

    Result: 

    OK 

    REPLACE NO. 3 JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  19

  13. CONNECT CONNECTOR 
    1. Reconnect the G80 No. 3 junction connector.

    Result: 

    NEXT 

    See step  14

  14. CHECK FOR SHORT IN CAN BUS WIRES (LANE RECOGNITION CAMERA SENSOR ASSEMBLY) 
    1. Disconnect the W12 lane recognition camera sensor assembly connector.
      GTY613939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      W12-1 (CA1P) - W12-2 (CA1N) Engine switch off 54 to 69 Ω
      W12-1 (CA1P) - G37-4 (CG) Engine switch off 200 Ω or higher
      W12-2 (CA1N) - G37-4 (CG) Engine switch off 200 Ω or higher
      W12-1 (CA1P) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      W12-2 (CA1N) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Lane Recognition Camera Sensor Assembly)
      *b Front view of DLC3

    Result: 

    OK 

    REPLACE LANE RECOGNITION CAMERA SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE LANE RECOGNITION CAMERA SENSOR ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CA1P, CA1N) 

  15. CONNECT CONNECTOR 
    1. Reconnect the G80 No. 3 junction connector.

    Result: 

    NEXT 

    See step  16

  16. CHECK FOR SHORT IN CAN BUS WIRES (DRIVER MONITOR ECU ASSEMBLY) 
    1. Disconnect the G62 driver monitor ECU assembly connector.
      GTY678445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G62-9 (CANH) - G62-24 (CANL) Engine switch off 54 to 69 Ω
      G62-9 (CANH) - G37-4 (CG) Engine switch off 200 Ω or higher
      G62-24 (CANL) - G37-4 (CG) Engine switch off 200 Ω or higher
      G62-9 (CANH) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      G62-24 (CANL) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Driver Monitor ECU Assembly)
      *b Front view of DLC3

    Result: 

    OK 

    REPLACE DRIVER MONITOR ECU ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE DRIVER MONITOR ECU ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CANH, CANL) 

  17. CONNECT CONNECTOR 
    1. Reconnect the G80 No. 3 junction connector.

    Result: 

    NEXT 

    See step  18

  18. CHECK FOR SHORT IN CAN BUS WIRES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Disconnect the A12 millimeter wave radar sensor assembly connector.
      GTY631365Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      A12-4 (CA1P) - A12-3 (CA1N) Engine switch off 108 to 132 Ω
      A12-4 (CA1P) - G37-4 (CG) Engine switch off 200 Ω or higher
      A12-3 (CA1N) - G37-4 (CG) Engine switch off 200 Ω or higher
      A12-4 (CA1P) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      A12-3 (CA1N) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Millimeter Wave Radar Sensor Assembly)
      *b Front view of DLC3

    Result: 

    OK 

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY CAN MAIN WIRE OR CONNECTOR (CA1P, CA1N) 

  19. CONNECT CONNECTOR 
    1. Reconnect the G80 No. 3 junction connector.

    Result: 

    NEXT 

    See step  20

  20. CHECK FOR SHORT IN CAN BUS WIRES (DRIVING SUPPORT ECU ASSEMBLY) 
    1. Disconnect the G43 driving support ECU assembly connector.
      GTY661417Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      G43-40 (CA1P) - G43-18 (CA1N) Engine switch off 108 to 132 Ω
      G43-40 (CA1P) - G37-4 (CG) Engine switch off 200 Ω or higher
      G43-18 (CA1N) - G37-4 (CG) Engine switch off 200 Ω or higher
      G43-40 (CA1P) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      G43-18 (CA1N) - G37-16 (BAT) Engine switch off 6 kΩ or higher
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Driving Support ECU Assembly)
      *b Front view of DLC3

    Result: 

    OK 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE DRIVING SUPPORT ECU ASSEMBLY CAN MAIN WIRE OR CONNECTOR (CA1P, CA1N) 

  21. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - BATTERY AND BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY666085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [08/2015 - 08/2019] ).

    2. Disconnect the G43 driving support ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G43-25 (GND) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      G43-30 (B) - Body ground Engine switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Driving Support ECU Assembly)

    Result: 

    OK 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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