CAN COMMUNICATION SYSTEM(w/o Central Gateway ECU), 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 multiplex tilt and telescopic ECU continues.
  • Multiplex tilt and telescopic ECU branch line or connector

  • Power source circuit of multiplex tilt and telescopic ECU

  • Multiplex tilt and telescopic ECU ground circuit

  • Multiplex tilt and telescopic ECU

Tech Tips

This diagnosis procedure is for when DTC U1115 is output by the main body ECU (GTS display: Main Body).

WIRING DIAGRAM

A0004RCE30
A000904E12

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

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

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the power switch on (IG) and wait at least 20 seconds.

  • After the repair, perform CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

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 DTC U1002 is output from Main Body of the main body ECU, this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.

      Result
      Result Proceed to
      U1002 is not output from main body ECU (GTS display: Main Body) A
      U1002 is output from main body ECU (GTS display: Main Body) B

    B
    A
  2. CHECK FOR OPEN IN SUB BUS 1 LINES (MULTIPLEX TILT AND TELESCOPIC ECU BRANCH LINE)


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

    2. A00045NE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multiplex Tilt and Telescopic ECU)

      Disconnect the H12 multiplex tilt and telescopic ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H12-3 (CANP) - H12-11 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)


    1. A0003H0E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multiplex Tilt and Telescopic ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H12-1 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

    NG
    OK
  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)


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

    2. A0008R4E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multiplex Tilt and Telescopic ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H12-9 (ECUB) - Body ground Power switch off 11 to 14 V
      H12-10 (IG) - Body ground Power switch on (IG) 11 to 14 V

    OK
    NG