LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2021 >> LX 570 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System - Diagnostic Codes & Circuit Tests (1 Of 2) >> Can Communication System >> DTC U1002: Lost Communication with Gateway Module (Sensor Bus) [09/2015 - 08/2020] >> Procedure

DTC U1002: Lost Communication with Gateway Module (Sensor Bus) [09/2015 - 08/2020]: Procedure

  1. CHECK LOCAL BUS 
    1. Disconnect the cable from the negative (-) battery terminal.
      GTY626134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Resistance: Malfunction
      E138-8 (CA1P) - E138-9 (CA1N) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Below 53 Ω: Short in line
      E138-8 (CA1P) - E138-9 (CA1N) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Higher than 70 Ω: Open in CAN main bus line
      E138-8 (CA1P) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      E138-9 (CA1N) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: +B short
      E138-8 (CA1P) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: Ground short
      E138-9 (CA1N) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: Ground short
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Driving Support ECU Assembly)
      *B Front view of DLC3
      RESULT

      Result Proceed to
      OK A
      NG (Open circuit in CAN main bus wire) B
      NG (Short circuit between bus wire) C
      NG
      • Ground short
      • +B short
      		 D

    Result: 

    B 

    See step  3

    Result: 

    C 

    See step  8

    Result: 

    D 

    See step  15

    Result: 

    A 

    See step  2

  2. CHECK FOR DTC 
    1. Clear the DTCs (Refer to DTC CHECK / CLEAR [09/2015 - ] ).
    2. Recheck for DTCs and check that no DTCs are output (Refer to DTC CHECK / CLEAR [09/2015 - ] ).

      OK:

      DTC U1002 is not output.

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] )

    Result: 

    NG 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY 

    (Refer to REMOVAL [09/2015 - ] )

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (FORWARD RECOGNITION CAMERA) 
    1. Disconnect the forward recognition camera connector.
      GTY683878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R15-6 (CANH) - R15-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Forward Recognition Camera)

    Result: 

    OK 

    REPLACE FORWARD RECOGNITION CAMERA 

    (Refer to REMOVAL [09/2015 - ] )

    Result: 

    NG 

    See step  4

  4. CONNECT CONNECTOR 
    1. Reconnect the R15 forward recognition camera connector.

    Result: 

    NEXT 

    See step  5

  5. CHECK FOR OPEN IN CAN BUS MAIN WIRE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Disconnect the millimeter wave radar sensor assembly connector.
      GTY632690Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A67-5 (CA1P) - A67-6 (CA1N) Cable disconnected from negative (-) battery terminal 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 [09/2015 - ] )

    Result: 

    NG 

    See step  6

  6. CONNECT CONNECTOR 
    1. Reconnect the A67 millimeter wave radar sensor assembly connector.

    Result: 

    NEXT 

    See step  7

  7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 10 CAN JUNCTION CONNECTOR) 
    1. Disconnect the No. 10 CAN junction connector.
      GTY667960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to No. 10 CAN Junction Connector)      		 *b to Millimeter Wave Radar Sensor Assembly
      *c to Forward Recognition Camera - -
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connect to
      E164-5 (CANH) - E164-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Millimeter wave radar sensor assembly
      E164-7 (CANH) - E164-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Forward recognition camera
      RESULT

      Result Proceed to
      OK A
      NG (Millimeter wave radar sensor assembly CAN main wire) B
      NG (Forward recognition camera CAN main wire) C

    Result: 

    A 

    REPLACE NO. 10 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - FORWARD RECOGNITION CAMERA) 

  8. CHECK FOR SHORT IN CAN BUS WIRES (FORWARD RECOGNITION CAMERA) 
    1. Disconnect the forward recognition camera connector.
      GTY683878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R15-6 (CANH) - R15-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Forward Recognition Camera)

    Result: 

    OK 

    REPLACE FORWARD RECOGNITION CAMERA 

    (Refer to REMOVAL [09/2015 - ] )

    Result: 

    NG 

    See step  9

  9. CONNECT CONNECTOR 
    1. Reconnect the R15 forward recognition camera connector.

    Result: 

    NEXT 

    See step  10

  10. CHECK FOR SHORT IN CAN BUS WIRES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Disconnect the millimeter wave radar sensor assembly connector.
      GTY632690Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A67-5 (CA1P) - A67-6 (CA1N) Cable disconnected from negative (-) battery terminal 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 [09/2015 - ] )

    Result: 

    NG 

    See step  11

  11. CONNECT CONNECTOR 
    1. Reconnect the A67 millimeter wave radar sensor assembly connector.

    Result: 

    NEXT 

    See step  12

  12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 CAN JUNCTION CONNECTOR) 
    1. Disconnect the No. 10 CAN junction connector.
      GTY633770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to No. 10 CAN Junction Connector)      		 *b to Millimeter Wave Radar Sensor Assembly
      *c to Forward Recognition Camera *d to Driving Support ECU Assembly
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connect to
      E164-5 (CANH) - E164-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Millimeter wave radar sensor assembly
      E164-6 (CANH) - E164-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Forward recognition camera
      E164-7 (CANH) - E164-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Driving support ECU assembly
      RESULT

      Result Proceed to
      OK A
      NG (Millimeter wave radar sensor assembly CAN main wire) B
      NG (Forward recognition camera CAN main wire) C
      NG (Driving support ECU assembly CAN branch wire) D

    Result: 

    A 

    REPLACE NO. 10 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - FORWARD RECOGNITION CAMERA) 

    Result: 

    D 

    See step  13

  13. CONNECT CONNECTOR 
    1. Reconnect the E164 No. 10 CAN junction connector.

    Result: 

    NEXT 

    See step  14

  14. CHECK FOR SHORT IN CAN BUS WIRES (DRIVING SUPPORT ECU ASSEMBLY) 
    1. Disconnect the driving support ECU assembly connector.
      GTY674091Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E138-8 (CA1P) - E138-9 (CA1N) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      TEXT IN ILLUSTRATION

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

    Result: 

    OK 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY 

    (Refer to REMOVAL [09/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - NO. 10 CAN JUNCTION CONNECTOR) 

  15. CHECK FOR SHORT IN CAN BUS WIRES (FORWARD RECOGNITION CAMERA) 
    1. Disconnect the forward recognition camera connector.
      GTY623268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R15-6 (CANH) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      R15-12 (CANL) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      R15-6 (CANH) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      R15-12 (CANL) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Forward Recognition Camera)
      *b Front view of DLC3

    Result: 

    OK 

    REPLACE FORWARD RECOGNITION CAMERA 

    (Refer to REMOVAL [09/2015 - ] )

    Result: 

    NG 

    See step  16

  16. CONNECT CONNECTOR 
    1. Reconnect the R15 forward recognition camera connector.

    Result: 

    NEXT 

    See step  17

  17. CHECK FOR SHORT IN CAN BUS WIRES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 
    1. Disconnect the millimeter wave radar sensor assembly connector.
      GTY648910Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A67-5 (CA1P) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A67-6 (CA1N) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      A67-5 (CA1P) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      A67-6 (CA1N) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω 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 [09/2015 - ] )

    Result: 

    NG 

    See step  18

  18. CONNECT CONNECTOR 
    1. Reconnect the A67 millimeter wave radar sensor assembly connector.

    Result: 

    NEXT 

    See step  19

  19. CHECK FOR SHORT IN CAN BUS WIRES (NO. 10 CAN JUNCTION CONNECTOR) 
    1. Disconnect the No. 10 CAN junction connector.
      GTY678104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to No. 10 CAN Junction Connector)      		 *b Front view of DLC3
      *c to Millimeter Wave Radar Sensor Assembly *d to Forward Recognition Camera
      *e to Driving Support ECU Assembly - -
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connect to
      E164-5 (CANH) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Millimeter wave radar sensor assembly
      E164-15 (CANL) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      E164-5 (CANH) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      E164-15 (CANL) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      E164-6 (CANH) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Forward recognition camera
      E164-16 (CANL) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      E164-6 (CANH) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      E164-16 (CANL) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      E164-7 (CANH) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Driving support ECU assembly
      E164-17 (CANL) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      E164-7 (CANH) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      E164-17 (CANL) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      RESULT

      Result Proceed to
      OK A
      NG (Millimeter wave radar sensor assembly CAN main wire) B
      NG (Forward recognition camera CAN main wire) C
      NG (Driving support ECU assembly CAN branch wire) D

    Result: 

    A 

    REPLACE NO. 10 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - MILLIMETER WAVE RADAR SENSOR ASSEMBLY) 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 10 CAN JUNCTION CONNECTOR - FORWARD RECOGNITION CAMERA) 

    Result: 

    D 

    See step  20

  20. CONNECT CONNECTOR 
    1. Reconnect the E164 No. 10 CAN junction connector.

    Result: 

    NEXT 

    See step  21

  21. CHECK FOR SHORT IN CAN BUS WIRES (DRIVING SUPPORT ECU ASSEMBLY) 
    1. Disconnect the driving support ECU assembly connector.
      GTY684205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E138-8 (CA1P) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      E138-9 (CA1N) - E22-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      E138-8 (CA1P) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      E138-9 (CA1N) - E22-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      TEXT IN ILLUSTRATION

      *a Front 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 [09/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - NO. 10 CAN JUNCTION CONNECTOR) 

scientia non olet · About LEMON Manuals