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CAN COMMUNICATION SYSTEM AFS ECU Communication Stop Mode

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DTC Code DTC Name
  AFS ECU Communication Stop Mode
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DESCRIPTION

Detection Item Symptom Trouble Area
AFS ECU Communication Stop Mode

  • "AFS/HL Auto Leveling" is not displayed on "Communication Bus Check" screen of the intelligent tester.

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

  • Headlight swivel ECU (AFS ECU) branch wire or connector

  • Power source circuit of headlight swivel ECU (AFS ECU)

  • Headlight swivel ECU (AFS ECU)
A01CELAE12
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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


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    CHECK CAN BUS WIRE FOR DISCONNECTION (AFS ECU BRANCH WIRE)


    1. Turn the engine switch off.

    2. A01CG90E37

      Disconnect the headlight swivel ECU (AFS ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A23-12 (CANH) - A23-13 (CANL) Engine switch off 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Swivel ECU)

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    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01CG90E38

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A23-22 (E1) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Swivel ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A23-15 (IG) - Body ground Engine switch on (IG) 11 to 14 V

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    REPLACE HEADLIGHT SWIVEL ECU (AFS ECU)Click here

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    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (HEADLIGHT SWIVEL ECU)

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    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)