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CAN COMMUNICATION SYSTEM Navigation ECU Communication Stop Mode

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DTC Code DTC Name
  Navigation ECU Communication Stop Mode
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DESCRIPTION

Detection Item Symptom Trouble Area
Navigation ECU Communication Stop Mode

  • "AVN1" is not displayed on the "Communication Bus Check" screen of the intelligent tester.

  • Applies to Navigation ECU Communication Stop Mode in DTC Combination Table.

  • Navigation ECU sub-assembly branch wire or connector

  • Power source circuit of navigation ECU sub-assembly

  • Navigation ECU sub-assembly
A01CB7AE08
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • Turn the engine switch off before measuring the resistances of the CAN bus main wires and the CAN bus branch wires.

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

  • After the engine 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 engine switch, any other switches or the doors. If any doors need to be opened in order to check the connectors, open the doors and leave them open.

Tip:

  • Operating the engine 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.

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PROCEDURE


  1. Click here

    CHECK FOR OPEN IN CAN BUS WIRES (NAVIGATION ECU BRANCH WIRE)


    1. Turn the engine switch off.

    2. A01CE2ZE02

      Disconnect the navigation ECU connectors.

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

      Standard Resistance (w/o Front Center Speaker)
      Tester Connection Condition Specified Condition
      F36-9 (CANH) - F36-10 (CANL) Engine switch off 54 to 69 Ω
      Standard Resistance (w/ Front Center Speaker)
      Tester Connection Condition Specified Condition
      F23-1 (CANH) - F23-2 (CANL) Engine switch off 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly (w/o Front Center Speaker))
      *b

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly (w/ Front Center Speaker))

  2. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01CDS2E03

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

      Standard Resistance (w/o Front Center Speaker)
      Tester Connection Condition Specified Condition
      F34-7 (GND) - Body ground Always Below 1 Ω
      Standard Resistance (w/ Front Center Speaker)
      Tester Connection Condition Specified Condition
      F23-12 (GND1) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly (w/o Front Center Speaker))
      *b

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly (w/ Front Center Speaker))
    2. A01CFOFE02

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

      Standard Voltage (w/o Front Center Speaker)
      Tester Connection Condition Specified Condition
      F34-4 (+B1) - Body ground Always 11 to 14 V
      F34-3 (ACC1) - Body ground Engine switch on (ACC) 11 to 14 V
      F36-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Standard Voltage (w/ Front Center Speaker)
      Tester Connection Condition Specified Condition
      F23-17 (+B1) - Body ground Always 11 to 14 V
      F23-16 (ACC1) - Body ground Engine switch on (ACC) 11 to 14 V
      F23-15 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly (w/ Front Center Speaker))

      		 *b

      Front view of wire harness connector

      (to Navigation ECU Sub-assembly (w/o Front Center Speaker))

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    REPLACE NAVIGATION ECU SUB-ASSEMBLY (NAVIGATION ECU)Click here

  4. Click here

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (NAVIGATION ECU BRANCH WIRE)

  5. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)