CLOCK SYSTEM Illumination Circuit

DESCRIPTION


  1. w/o Multi-information Display:

    The clock assembly uses this circuit to receive the illumination signal via the direct line. The combination meter assembly controls illumination through the ILL+ terminal.

  2. w/ Multi-information Display:

    The clock assembly uses this circuit to receive the auto dimmer signal and tail cancel signal. When the clock assembly receives an auto dimmer signal from the main body ECU through the combination meter assembly via the direct line, the combination meter assembly causes the clock display to be dimmed. When the meter CPU receives an auto dimmer signal, it dims the meter illumination and clock illumination. The main body ECU determines whether it is daytime, twilight, or nighttime based on the waveform transmitted from the automatic light control sensor. If the main body ECU determines that it is daytime, the ECU does not send auto dimmer signals. Therefore, the clock illumination (multi-information display) will not dim even if the driver accidentally turns the light control switch to the TAIL or HEAD position in daytime.

    Tech Tips

    If the automatic light control sensor has a malfunction, DTC B1244 is output. Click here

WIRING DIAGRAM


  1. w/o Multi-information Display:

    A017BQVE01

  2. w/ Multi-information Display:

    A017DJWE01

INSPECTION PROCEDURE

PROCEDURE


  1. CONFIRM SYMPTOMS


    1. Confirm the symptom.

      Result
      Result Proceed to
      Only clock illumination has a malfunction. A
      Clock illumination, combination meter assembly illumination, and heater control panel illumination have a malfunction. B

    B

    GO TO METER / GAUGE SYSTEM Click here

    A

  2. SYSTEM CHECK


    1. Confirm the vehicle model.

      Result
      Result Proceed to
      w/o Multi-information Display A
      w/ Multi-information Display B

    B

    CHECK CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER)


    1. A017B2KE01

      Disconnect E1 and E20 connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E20-3 (ILL+) - E1-30 (ILL-) Always Below 1 Ω
      E1-30 (ILL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT CLOCK ASSEMBLY


    1. A017B5ME05

      Reconnect the E20 connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      E1-30 (ILL-) - Body ground Ignition switch on (IG), headlight dimmer switch TAIL or HEAD 11 to 14 V
      E1-30 (ILL-) - Body ground Ignition switch on (IG), headlight dimmer switch OFF Below 1 V

    NG

    REPLACE CLOCK ASSEMBLY Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  5. CHECK CAN COMMUNICATION SYSTEM


    1. Check if any DTC is output Click here.

      Result
      Result Proceed to
      CAN communication DTC is not output. A
      CAN Communication DTC is output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  6. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Ignition switch on (IG).

    3. Turn the tester ON.

    4. Enter the following menus: Body Electrical / Main Body / Active Test.

    5. Check the clock illumination.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Dimmer Signal Dimmer Signal Dimmer signal is OFF/ON Confirm that the vehicle is stopped, engine idling
      OK
      The clock illumination is dimmed when the Dimmer signal is ON.

      Tech Tips

      Refer to the sensitivity setting in the customization table of the lighting system Click here.


    NG

    CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER) Click here

    OK

    GO TO LIGHTING SYSTEM Click here

  7. CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER)


    1. A017B8LE10

      Disconnect the E1 and E9 connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E9-9 (CLK) - E1-36 (MCLK) Always Below 1 Ω
      E9-10 (DATA) - E1-37 (MDAT) Always Below 1 Ω
      E9-11 (SYNC) - E1-38 (SYNC) Always Below 1 Ω
      E1-36 (MCLK) - Body ground Always 10 kΩ or higher
      E1-37 (MDAT) - Body ground Always 10 kΩ or higher
      E1-38 (SYNC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT COMBINATION METER ASSEMBLY


    1. A017C1XE20

      Reconnect the E1 connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      E9-9 (CLK) - Body ground Ignition switch on (IG), headlight dimmer switch TAIL or HEAD Pulse generation
      E9-10 (DATA) - Body ground Ignition switch on (IG), headlight dimmer switch TAIL or HEAD Pulse generation
      E9-11 (SYNC) - Body ground Ignition switch on (IG), headlight dimmer switch TAIL or HEAD Pulse generation
      E9-9 (CLK) - Body ground Ignition switch on (IG), headlight dimmer switch OFF Below 1 V
      E9-10 (DATA) - Body ground Ignition switch on (IG), headlight dimmer switch OFF Below 1 V
      E9-11 (SYNC) - Body ground Ignition switch on (IG), headlight dimmer switch OFF Below 1 V

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    REPLACE CLOCK ASSEMBLY Click here