METER / GAUGE SYSTEM Headup Display Malfunction

DESCRIPTION

This circuit is the power source circuit for the headup display. This circuit provides two types of power sources; one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission.

WIRING DIAGRAM

A0000ORE02

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • When replacing the combination meter assembly, make sure to replace it with a new one.

  • Before starting the following inspection, confirm the headup display position and illuminance, then perform the operation check.

    Click here

PROCEDURE


  1. SYSTEM CHECK


    1. Check the symptom of the headup display.

      Result
      Result Proceed to
      Headup display does not operate at all A
      Headup display does not change B

    B

    CONFIRM DTC OUTPUT (HEADUP DISPLAY) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU - BATTERY AND BODY GROUND)


    1. A00016MC03
      *a

      Front view of wire harness connector

      (to Combination Meter Mirror ECU)

      Disconnect the combination meter mirror ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      J5-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      J5-2 (B) - Body ground Power switch off 11 to 14 V
      J5-5 (ACC) - Body ground Power switch on (ACC) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J5-4 (ES) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT HEADUP DISPLAY SWITCH ASSEMBLY


    1. Remove the headup display switch assembly.

      Click here

    2. Inspect the headup display switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADUP DISPLAY SWITCH ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU - HEADUP DISPLAY SWITCH ASSEMBLY)


    1. Disconnect the J5 combination meter mirror ECU connector.

    2. Disconnect the I70 headup display switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J5-10 (SW2) - I70-10 (ILD) Always Below 1 Ω
      J5-9 (SW1) - I70-12 (ILU) Always Below 1 Ω
      J5-16 (E) - I70-6 (CH) Always Below 1 Ω
      J5-10 (SW2) or I70-10 (ILD) - Body ground Always 10 kΩ or higher
      J5-9 (SW1) or I70-12 (ILU) - Body ground Always 10 kΩ or higher
      J5-16 (E) or I70-6 (CH) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER MIRROR ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CONFIRM DTC OUTPUT (HEADUP DISPLAY)


    1. Confirm DTC output.

      Click here

      Result
      Result Proceed to
      DTC is not output A
      DTC (01, 02) is output B
      DTC (03, 04) is output C

    A

    REPLACE COMBINATION METER MIRROR ECU Click here

    C

    CHECK FOR DTC (NAVIGATION SYSTEM, AUDIO AND VISUAL SYSTEM) Click here

    B

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER MIRROR ECU - COMBINATION METER ASSEMBLY)


    1. Disconnect the J5 combination meter mirror ECU connector.

    2. Disconnect the I10 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J5-6 (TX-) - I10-32 (TX-) Always Below 1 Ω
      J5-7 (CS) - I10-33 (CS) Always Below 1 Ω
      J5-6 (TX-) or I10-32 (TX-) - Body ground Always 10 kΩ or higher
      J5-7 (CS) or I10-33 (CS) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK COMBINATION METER ASSEMBLY


    1. A00021MC01
      *a

      Component with harness connected

      (Combination Meter Mirror ECU)
      *b Waveform

      Remove the combination meter mirror ECU with the connector(s) still connected.

    2. Connect an oscilloscope to terminal J5-6 (TX-) and body ground.

    3. Check the signal waveform according to the condition(s) in the table below.

      Measurement Condition
      Item Condition
      Tester connection J5-6 (TX-) - Body ground
      Tool setting 5 V/DIV., 200 μs./DIV.
      Vehicle condition Power switch on (IG)
      OK
      The waveform displayed is as shown in the illustration.

      Tech Tips

      The period of the signal changes depending on the communication state.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  8. CHECK COMBINATION METER ASSEMBLY


    1. A00010DC01
      *a

      Component with harness connected

      (Combination Meter Mirror ECU)
      *b Waveform

      Remove the combination meter mirror ECU with the connector(s) still connected.

    2. Connect an oscilloscope to terminal J5-7 (CS) and body ground.

    3. Check the signal waveform according to the condition(s) in the table below.

      Measurement Condition
      Item Condition
      Tester connection J5-7 (CS) - Body ground
      Tool setting 5 V/DIV., 2 ms./DIV.
      Vehicle condition Power switch on (IG)

      Tech Tips

      The period of the signal changes depending on the communication state.

      OK
      The waveform displayed is as shown in the illustration.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER MIRROR ECU Click here

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

  9. CHECK FOR DTC (NAVIGATION SYSTEM, AUDIO AND VISUAL SYSTEM)


    1. Check for DTCs.

      w/ Navigation System: Click here

      w/ Audio and Visual System (except 8 Speakers): Click here

      w/ Audio and Visual System (for 8 Speakers): Click here


      Body Electrical > Navigation System > Trouble Codes
      OK
      DTCs are not output.
      Result
      Result Proceed to
      OK A
      NG (w/ Navigation System) B
      NG (w/ Audio and Visual System [except 8 Speakers]) C
      NG (w/ Audio and Visual System [for 8 Speakers]) D

    A

    REPLACE COMBINATION METER MIRROR ECU Click here

    B

    GO TO NAVIGATION SYSTEM Click here

    C

    GO TO AUDIO AND VISUAL SYSTEM Click here

    D

    GO TO AUDIO AND VISUAL SYSTEM Click here