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.

   Tip:

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

WIRING DIAGRAM

1. 

   w/o Multi-information Display:

2. 

   w/ Multi-information Display:

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   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

   
   
   • AClick here
   • BClick here
2. Click here

   SYSTEM CHECK

   
   

   1. Confirm the vehicle model.

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

   
   
   • AClick here
   • BClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER)

   
   
   1. 

      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

   
   
   • OKClick here
   • NGClick here
4. Click here

   INSPECT CLOCK ASSEMBLY

   
   
   1. 

      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

   
   
   • OKClick here
   • NGClick here
5. Click here

   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

   
   
   • AClick here
   • BClick here
6. Click here

   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.

      Tip:

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

   
   
   • OKClick here
   • NGClick here
7. Click here

   CHECK HARNESS AND CONNECTOR (CLOCK ASSEMBLY - COMBINATION METER)

   
   
   1. 

      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

   
   
   • OKClick here
   • NGClick here
8. Click here

   INSPECT COMBINATION METER ASSEMBLY

   
   
   1. 

      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

   
   
   • OKClick here
   • NGClick here
9. Click here

   GO TO METER / GAUGE SYSTEMClick here

10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

11. Click here

    REPLACE CLOCK ASSEMBLYClick here

12. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

13. Click here

    GO TO CAN COMMUNICATION SYSTEMClick here

14. Click here

    GO TO LIGHTING SYSTEMClick here