LIGHTING SYSTEM ACC Signal Circuit

DESCRIPTION

This circuit detects the ignition switch ACC or off condition, and sends it to the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

A005K1DE02

CAUTION / NOTICE / HINT

Tech Tips

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

Note

Initialization is necessary when the main body ECU (multiplex network body ECU) is replaced* Click here.


  • *: w/ Automatic Light Control System

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ACC SW)


    1. Using the intelligent tester, read the Data List Click here.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ACC SW Ignition switch ACC signal / ON or OFF

      ON: Ignition switch ACC or ON

      OFF: Ignition switch off

      		 -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      NG A
      OK B

    B

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

    A

  2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - POWER SOURCE, BODY GROUND)


    1. Disconnect the 3B and 3E*1or 3F*2 instrument panel junction block assembly connectors.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      3B-37 - Body ground Ignition switch ACC or ON 11 to 14 V
      3E-1 - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      3B-37 - Body ground Ignition switch ACC or ON 11 to 14 V
      3F-1 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-8 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. 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.

      A005GD4E01
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3E-1 - MB-29 (ACC)

      Connect a positive (+) lead from the battery → 3B-37

      Connect a negative (-) lead from the battery → 3B-8

      		 Below 1 Ω

      Not connect a positive (+) lead from the battery → 3B-37

      Not connect a negative (-) lead from the battery → 3B-8

      		 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      3F-1 - MB-29 (ACC)

      Connect a positive (+) lead from the battery → 3B-37

      Connect a negative (-) lead from the battery → 3B-8

      		 Below 1 Ω

      Not connect a positive (+) lead from the battery → 3B-37

      Not connect a negative (-) lead from the battery → 3B-8

      		 10 kΩ or higher

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here