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

DTC Code DTC Name
U1112 Lost Communication with Combination Switch ECU

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

WIRING DIAGRAM

A01GKXEE01

INSPECTION PROCEDURE

Note


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

  • Before inspecting this circuit, perform an inspection of the electric power control ECU communication stop mode Click here.

Tech Tips

Operating the engine 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 engine 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 FOR OPEN IN CAN BUS WIRE (WINDSHIELD WIPER SWITCH ASSEMBLY CAN BRANCH WIRE)


    1. A01GIYZE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Windshield Wiper Switch Assembly)

      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) Engine switch off 54 to 69 Ω

    NG

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

    OK

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


    1. A01GIYZE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Windshield Wiper Switch Assembly)

      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. 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 Engine 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here