CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1115

DTC Code DTC Name
U1115 Lost Communication with Tilt and Telescopic Module

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
U1115 No communication from the tilt and telescopic ECU.

  • Tilt and telescopic ECU main wire or connector

  • Power source circuit of tilt and telescopic ECU

  • Tilt and telescopic ECU (Multiplex tilt and telescopic ECU)

WIRING DIAGRAM

A01ND6TE01

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tech Tips

      If CAN MS bus DTC U1002 is output from the main body ECU (Intelligent tester display/Main Body), troubleshoot for U1002 and check for malfunctions in the CAN MS bus circuit.

      Result
      Result Proceed to
      U1002 is not output from main body ECU (Intelligent tester display/Main Body) A
      U1002 is output from main body ECU (Intelligent tester display/Main Body) B

    B

    GO TO CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK CAN BUS WIRE FOR DISCONNECTION (MULTIPLEX TILT AND TELESCOPIC ECU MAIN WIRE)


    1. Turn the power switch off.

    2. A01NF0IE11
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Tilt and Telescopic ECU)

      Disconnect the tilt and telescopic ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F36-5 (CANP) - F36-14 (CANN) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU MAIN WIRE)

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


    1. A01NF0IE12
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Tilt and Telescopic ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F36-9 (ECUB) - Body ground Always 11 to 14 V
      F36-8 (IG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. Turn the power switch off.

    2. A01NF0IE13
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Tilt and Telescopic ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F36-11 (GND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE MULTIPLEX TILT & TELESCOPIC ECU (for RHD) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

    A

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (for LHD) Click here