METER / GAUGE SYSTEM Accessory Meter does not Illuminate

DESCRIPTION

This circuit provides power to the accessory meter assembly.

The clock and accessory meter illuminance can be adjusted by pressing the H, M, or light adjustment switch in the heater control panel.

Tech Tips


  • The whole heater control panel should be replaced if any of the switches is malfunctioning.

  • If the accessory meter assembly displays "1:00" in turning the power switch off, then to on (IG) again, the +B terminal has a malfunction.

  • The maximum clock assembly margin of error is -4 to 4 seconds per day when the temperature is between -20°C (-4°F) and 60°C (140°F).

WIRING DIAGRAM

A01NEDNE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK ACCESSORY METER ASSEMBLY


    1. Check type of accessory meter assembly malfunction.

      Result
      Result Proceed to
      Accessory meter assembly does not display at all. A
      Accessory meter assembly does not dim at night. B
      Clock cannot be adjusted. C

    B

    SYSTEM CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (HEATER CONTROL PANEL - ACCESSORY METER ASSEMBLY) Click here

    A

  2. INSPECT FUSE (ECU-ACC, ECU-B NO. 1, ECU-B NO. 2, ECU-IG2)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ECU-ACC fuse Always Below 1 Ω
      ECU-B No. 1 fuse Always Below 1 Ω
      ECU-B No. 2 fuse Always Below 1 Ω
      ECU-IG2 fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  3. CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY CIRCUIT)


    1. A01NCM5E20
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Accessory Meter Assembly)

      Disconnect the G1 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G1-1 (IG+) - Body ground Power switch on (IG) 11 to 14 V
      G1-2 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      G1-3 (ACC) - Body ground power switch on (ACC) 11 to 14 V
      G1-13 (+B) - Body ground Power switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G1-12 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ACCESSORY METER ASSEMBLY Click here

  4. SYSTEM CHECK


    1. Confirm the symptoms.

      Result
      Result Proceed to
      All illumination parts does not dim at night. A
      Only accessory meter assembly illumination does not dim at night. B

    B

    INSPECT MULTIPLEX NETWORK BODY ECU Click here

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

  5. INSPECT MULTIPLEX NETWORK BODY ECU


    1. A01NCM5E23
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Accessory Meter Assembly)

      Disconnect the G1 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G1-14 (ADIM) - Body ground Power switch on (IG), turn the light control switch to the tail or head position. 4 V or more

    NG

    CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - MAIN BODY ECU) Click here

    OK

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


    1. A01NHX7E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Accessory Meter Assembly)
      *2

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the F15 connector.

    2. Disconnect the G1 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G1-24 (ILL-) - F15-15 (ILL-) Always Below 1 Ω
      G1-24 (ILL-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ACCESSORY METER ASSEMBLY Click here

  7. CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - MAIN BODY ECU)


    1. A01NH0AE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Accessory Meter Assembly)
      *2

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      Disconnect the F14 connector.

    2. Disconnect the G1 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G1-14 (ADIM) - F14-22 (ACAN) Always Below 1 Ω
      G1-14 (ADIM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ACCESSORY METER ASSEMBLY Click here

  8. CHECK HARNESS AND CONNECTOR (HEATER CONTROL PANEL - ACCESSORY METER ASSEMBLY)


    1. A01NHX7E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Accessory Meter Assembly)
      *2

      Front view of wire harness connector

      (to Heater Control Panel)

      Disconnect the G8 connector.

    2. Disconnect the G1 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G1-17 (CLK2) - G8-4 (CLK1) Always Below 1 Ω
      G1-17 (CLK2) - Body ground Always 10 kΩ or higher
      G1-18 (CLK4) - G8-12 (CLK3) Always Below 1 Ω
      G1-18 (CLK4) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT HEATER CONTROL PANEL


    1. A01NCM5E46
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Accessory Meter Assembly)

      Remove the heater control panel Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G1-17 (CLK2) - G1-18 (CLK4) H switch pressed Below 1 Ω
      H switch not pressed 10 kΩ or higher
      G1-17 (CLK2) - G1-18 (CLK4) M switch pressed Below 1 Ω
      M switch not pressed 10 kΩ or higher
      G1-17 (CLK2) - G1-18 (CLK4) : switch pressed Below 1 Ω
      : switch not pressed 10 kΩ or higher

    NG

    REPLACE HEATER CONTROL PANEL Click here

    OK

    REPLACE ACCESSORY METER ASSEMBLY Click here