LIGHTING SYSTEM Instrument Panel Illumination Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the panel relay to control the instrument panel illumination.

WIRING DIAGRAM

A01W2NZE05

CAUTION / NOTICE / HINT

Note


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

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Check that the relay operates.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Interior Panel Relay PANEL relay ON/OFF -
      OK
      PANEL relay operates.

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. INSPECT PANEL RELAY


    1. Remove the PANEL relay from the H153 PANEL relay connector.

    2. A01W1HWE34
      Text in Illustration
      *a

      Component without harness connected

      (PANEL Relay)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE PANEL RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (PANEL FUSE - PANEL RELAY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H153-1 - Body ground Always 11 to 14 V
      H153-3 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (PANEL RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H153-2 - 3A-38 Always Below 1 Ω
      H153-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Install the PANEL relay.

    2. Reconnect the 3A instrument panel junction block assembly connector.

    3. A01W4O3E02
      Text in Illustration
      *a

      Component with harness connected

      (Instrument Panel Junction Block Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3A-38 - Body ground Light control switch in off position 11 to 14 V
      Light control switch in tail or head position Below 1 V

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (PANEL RELAY - EACH INSTRUMENT PANEL ILLUMINATION)

    NG

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      A01W4YFE01
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-38 - MB-22 (PANL) Always Below 1 Ω

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here