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CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U1112

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DTC Code DTC Name
U1112 Lost Communication with Combination Switch ECU
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DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1112 There is no communication from the windshield wiper switch assembly.

  • Power source or inside of windshield wiper switch assembly

  • Windshield wiper switch assembly CAN branch wire or connector

  • Windshield wiper switch assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

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

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PROCEDURE


  1. Click here

    PRECAUTION

    Note:

    After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work (Click here).


  2. Click here

    DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) auxiliary 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 (-) auxiliary 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).


  3. Click here

    CHECK FOR OPEN IN CAN BUS WIRE (WINDSHIELD WIPER SWITCH ASSEMBLY CAN BRANCH WIRE)


    1. A01H1V1E01

      Disconnect the windshield wiper switch assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L25-5 (CANP) - L25-6 (CANN) Power switch off 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Windshield Wiper Switch Assembly)

  4. Click here

    CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY - BATTERY AND BODY GROUND)


    1. A01H1V1E02

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

      Note:

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L25-1 (B) - Body ground Always 11 to 14 V
      L25-2 (IG) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L25-8 (E) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Windshield Wiper Switch Assembly)

  5. Click here

    REPAIR OR REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)

  6. Click here

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLYClick here

  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR