CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002, U0073

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Power Management1)
U0073 Control Module Communication Bus Off

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area
U1002 Lost communication with the gateway module (Power Management1).

  • V2 bus circuit

  • Power management control ECU CAN main wire or connector

  • Headlight swivel ECU assembly CAN branch wire or connector*1

  • Headlight leveling ECU assembly CAN branch wire or connector*2

  • Air conditioning amplifier assembly CAN branch wire or connector

  • Power management control ECU

  • Headlight swivel ECU assembly*1

  • Headlight leveling ECU assembly*2

  • Air conditioning amplifier assembly

  • CAN junction connector
U0073 Control module communication bus is off.

  • V2 bus circuit

  • Power management control ECU CAN main wire or connector

  • Headlight swivel ECU assembly CAN branch wire or connector*1

  • Headlight leveling ECU assembly CAN branch wire or connector*2

  • Air conditioning amplifier assembly CAN branch wire or connector

  • Power management control ECU

  • Headlight swivel ECU assembly*1

  • Headlight leveling ECU assembly*2

  • Air conditioning amplifier assembly

  • CAN junction connector

WIRING DIAGRAM

A0058ICE02
A0056K5E02

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    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 Click here.


    NEXT

  2. 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 the CAN branch wire.

      CAUTION:

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

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  3. CHECK CAN BUS WIRE (CHECK MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE FOR SHORT CIRCUIT)


    1. A005561E02
      Text in Illustration
      *A except 3ZR-FE
      *B for 3ZR-FE
      *a

      Component with harness connected

      (Power Management Control ECU)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      except 3ZR-FE:
      Tester Connection Switch Condition Specified Condition Resistance: Malfunction
      D109-12 (CA3P) - D109-11 (CA3N) Ignition switch off 54 to 69 Ω Below 54 Ω: Short in line
      D109-12 (CA3P) - D109-11 (CA3N) Ignition switch off 54 to 69 Ω Higher than 69 Ω: Open in CAN main bus line
      D109-12 (CA3P) - D109-2 (AM21) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D109-11 (CA3N) - D109-2 (AM21) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D109-12 (CA3P) - D109-6 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short
      D109-11 (CA3N) - D109-6 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short
      for 3ZR-FE:
      Tester Connection Switch Condition Specified Condition Resistance: Malfunction
      D109-26 (CA2H) - D109-25 (CA2L) Ignition switch off 54 to 69 Ω Below 54 Ω: Short in line
      D109-26 (CA2H) - D109-25 (CA2L) Ignition switch off 54 to 69 Ω Higher than 69 Ω: Open in CAN main bus line
      D109-26 (CA2H) - D109-2 (AM21) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D109-25 (CA2L) - D109-2 (AM21) Ignition switch off 6 kΩ or higher Below 6 kΩ: +B short
      D109-26 (CA2H) - D109-6 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short
      D109-25 (CA2L) - D109-6 (GND) Ignition switch off 200 Ω or higher Below 200 Ω: Ground short
      Result
      Result Proceed to

      NG


      • Open in CAN main bus line

      		 A

      NG


      • Short in line

      • +B short

      • GND short

      		 B
      OK C

    B

    CHECK FOR SHORT IN CAN BUS WIRE (CAN JUNCTION CONNECTOR - HEADLIGHT ECU) Click here

    C

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND) Click here

    A

  4. CHECK FOR OPEN IN CAN BUS WIRE (CAN JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)


    1. A0056MCE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector)

      Disconnect the CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D93-1 (CANH) - D93-2 (CANL) Ignition switch off 108 to 132 Ω

    OK

    REPLACE CAN JUNCTION CONNECTOR

    NG

  5. CONNECT CONNECTOR


    1. Reconnect the D93 CAN junction connector.


    NEXT

  6. CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU - CAN JUNCTION CONNECTOR)


    1. A005433E02
      Text in Illustration
      *A except 3ZR-FE
      *B for 3ZR-FE
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the power management control ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      except 3ZR-FE:
      Tester Connection Switch Condition Specified Condition
      D109-12 (CA3P) - D109-11 (CA3N) Ignition switch off 108 to 132 Ω
      for 3ZR-FE:
      Tester Connection Switch Condition Specified Condition
      D109-26 (CA2H) - D109-25 (CA2L) Ignition switch off 108 to 132 Ω

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (POWER MANAGEMENT CONTROL ECU - CAN JUNCTION CONNECTOR)

  7. CHECK FOR SHORT IN CAN BUS WIRE (CAN JUNCTION CONNECTOR - HEADLIGHT ECU)


    1. A00581RE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector)
      *b Front view of DLC3

      Disconnect the CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D95-1 (CANH) - D95-2 (CANL) Ignition switch off 200 Ω or higher
      D95-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D95-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D95-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D95-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  8. CHECK FOR SHORT IN CAN BUS WIRES (CAN JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    Note

    For vehicles for 3ZR-FE, go to "Check for Short in CAN Bus Wire (CAN Junction Connector - Power Management Control ECU)".


    1. A0056XOE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector)
      *b Front view of DLC3

      Disconnect the CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D144-1 (CANH) - D144-2 (CANL) Ignition switch off 200 Ω or higher
      D144-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D144-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D144-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D144-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  9. CHECK FOR SHORT IN CAN BUS WIRE (CAN JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)


    1. A0056SBE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector)
      *b Front view of DLC3

      Disconnect the CAN junction connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D93-1 (CANH) - D93-2 (CANL) Ignition switch off 108 to 132 Ω
      D93-1 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D93-2 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D93-1 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D93-2 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    OK

    REPLACE CAN JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

  10. CONNECT CONNECTOR


    1. Reconnect the D95 CAN junction connector.


    NEXT

  11. CHECK FOR SHORT IN CAN BUS WIRE (HEADLIGHT ECU)


    1. Disconnect the headlight swivel ECU assembly*1 or headlight leveling ECU assembly*2 connector.


      • *1: w/ Adaptive Front-lighting System

      • *2: w/o Adaptive Front-lighting System

      A0058QVE02
      Text in Illustration
      *A w/ Adaptive Front-lighting System *B w/o Adaptive Front-lighting System
      *a

      Rear view of wire harness connector

      (to Headlight Swivel ECU Assembly)

      		 *b

      Front view of wire harness connector

      (to Headlight Leveling ECU Assembly)
      *c Front view of DLC3 - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      w/ Adaptive Front-lighting System
      Tester Connection Switch Condition Specified Condition
      A38-12 (CANH) - A38-13 (CANL) Ignition switch off 54 to 69 Ω
      A38-12 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      A38-13 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      A38-12 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      A38-13 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      w/o Adaptive Front-lighting System
      Tester Connection Switch Condition Specified Condition
      A66-6 (CANH) - A66-7 (CANL) Ignition switch off 54 to 69 Ω
      A66-6 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      A66-7 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      A66-6 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      A66-7 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      Result
      Result Proceed to
      OK (w/ Adaptive Front-lighting System) A
      OK (for LHD, w/o Adaptive Front-lighting System) B
      OK (for RHD, w/o Adaptive Front-lighting System) C
      NG D

    A

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    D

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO HEADLIGHT ECU (CANH, CANL)

  12. CONNECT CONNECTOR


    1. Reconnect the D95 and D144 CAN junction connectors.


    NEXT

  13. CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A0052XQE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)
      *b Front view of DLC3

      Disconnect the air conditioning amplifier assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D47-11 (CANH) - D47-12 (CANL) Ignition switch off 54 to 69 Ω
      D47-11 (CANH) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D47-12 (CANL) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D47-11 (CANH) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D47-12 (CANL) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER ASSEMBLY (CANH, CANL)

  14. CONNECT CONNECTOR


    1. Reconnect the D93, D95 and D144 CAN junction connectors.


    NEXT

  15. CHECK FOR SHORT IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU)


    1. A0053XXE02
      Text in Illustration
      *A except 3ZR-FE
      *B for 3ZR-FE
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *b Front view of DLC3

      Disconnect the power management control ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      except 3ZR-FE:
      Tester Connection Switch Condition Specified Condition
      D109-12 (CA3P) - D109-11 (CA3N) Ignition switch off 108 to 132 Ω
      D109-12 (CA3P) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D109-11 (CA3N) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D109-12 (CA3P) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D109-11 (CA3N) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      for 3ZR-FE:
      Tester Connection Switch Condition Specified Condition
      D109-26 (CA2H) - D109-25 (CA2L) Ignition switch off 108 to 132 Ω
      D109-26 (CA2H) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D109-25 (CA2L) - D8-4 (CG) Ignition switch off 200 Ω or higher
      D109-26 (CA2H) - D8-16 (BAT) Ignition switch off 6 kΩ or higher
      D109-25 (CA2L) - D8-16 (BAT) Ignition switch off 6 kΩ or higher

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (CA3P, CA3N, CA2H, CA2L)

  16. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND)


    1. A0052V7E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Connect the cable to the negative (-) battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Disconnect the power management control ECU connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D109-2 (AM21) - Body ground Always 11 to 14 V
      D109-1 (AM22) - Body ground Always 11 to 14 V

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D109-6 (GND) - Body ground Always Below 1 Ω
      D109-5 (GND2) - Body ground Always Below 1 Ω

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR