LIGHTING SYSTEM Power Source Circuit

DESCRIPTION

This circuit provides power to operate the headlight light control ECU sub-assembly LH and RH.

WIRING DIAGRAM

A01OFW5E04

CAUTION / NOTICE / HINT

Note


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

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY - BATTERY AND BODY GROUND)


    1. Disconnect the A3 headlight light control ECU sub-assembly LH connector.

    2. Disconnect the A11 headlight light control ECU sub-assembly RH connector.

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

      Standard Voltage
      Headlight Light Control ECU Sub-assembly LH Side
      Tester Connection Condition Specified Condition
      A3-13 (ECUB) - Body ground Light control switch in tail or head position 11 to 14 V
      A3-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Headlight Light Control ECU Sub-assembly RH Side
      Tester Connection Condition Specified Condition
      A11-13 (ECUB) - Body ground Light control switch in tail or head position 11 to 14 V
      A11-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Headlight Light Control ECU Sub-assembly LH Side
      Tester Connection Condition Specified Condition
      A3-12 (GND) - Body ground Always Below 1 Ω
      Headlight Light Control ECU Sub-assembly RH Side
      Tester Connection Condition Specified Condition
      A11-12 (GND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (Headlight Light Control ECU Sub-assembly LH Side) B
      NG (Headlight Light Control ECU Sub-assembly RH Side) C

    A

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

    C

    INSPECT H-LP RH OR H-LP RH/MIR HTR RELAY Click here

    B

  2. INSPECT H-LP LH RELAY


    1. Remove the H-LP LH relay from the No. 3 engine room relay block assembly.

    2. Inspect the H-LP LH relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE H-LP LH RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay terminal 1 - Body ground Always 11 to 14 V
      Relay terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 3 - A3-13 (ECUB) Always Below 1 Ω
      Relay terminal 3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 4C 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
      Relay terminal 2 - 4C-29 Always Below 1 Ω
      Relay terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  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.

      A01OG5IC17
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4C-29 - MB-15 (HRLY) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

  7. INSPECT H-LP RH OR H-LP RH/MIR HTR RELAY


    1. for LHD:


      1. Remove the H-LP RH/MIR HTR relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      2. Inspect the H-LP RH/MIR HTR relay.

        Click here

    2. for RHD:


      1. Remove the H-LP RH relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      2. Inspect the H-LP RH relay.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE H-LP RH OR H-LP RH/MIR HTR RELAY

    OK

  8. CHECK HARNESS AND CONNECTOR (H-LP RH OR H-LP RH/MIR HTR RELAY - BATTERY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay terminal 1 - Body ground Always 11 to 14 V
      Relay terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (H-LP RH OR H-LP RH/MIR HTR RELAY - HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 3 - A11-13 (ECUB) Always Below 1 Ω
      Relay terminal 3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (H-LP RH OR H-LP RH/MIR HTR RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the O2 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 2 - O2-1 (DIM) Always Below 1 Ω
      Relay terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR