LIGHTING SYSTEM Power Source Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives IG signals and supplies power to the headlight ECU sub-assembly via the headlight light dimmer relay.

WIRING DIAGRAM

A000R80E08

CAUTION / NOTICE / HINT

Note


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

  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY - POWER SOURCE AND BODY GROUND)


    1. Disconnect the B16*1and B15*2 headlight ECU sub-assembly connectors.


      • *1: for LH Side

      • *2: for RH Side

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

      Standard Voltage
      for LH Side
      Tester Connection Switch Condition Specified Condition
      B16-13 (ECUB) - Body ground Power switch on (IG) 11 to 14 V
      B16-4 (IG) - Body ground Power switch on (IG) 11 to 14 V
      for RH Side
      Tester Connection Switch Condition Specified Condition
      B15-13 (ECUB) - Body ground Power switch on (IG) 11 to 14 V
      B15-4 (IG) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      for LH Side
      Tester Connection Condition Specified Condition
      B16-12 (GND) - Body ground Always Below 1 Ω
      for RH Side
      Tester Connection Condition Specified Condition
      B15-12 (GND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (for LH Side) B
      NG (for RH Side) C

    A

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

    C

    CHECK HARNESS AND CONNECTOR (BATTERY - RH LAMP RELAY) Click here

    B

  2. CHECK HARNESS AND CONNECTOR (BATTERY - LH LAMP RELAY)


    1. Remove the LH LAMP relay relay from the No. 2 engine room relay block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Relay terminal 2 - Body ground Power switch off 11 to 14 V
      Relay terminal 5 - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT LH LAMP RELAY


    1. Remove the LH LAMP relay from the No. 2 engine room relay block.

    2. Inspect the LH LAMP relay Click here.


    NG

    REPLACE LH LAMP RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (LH LAMP RELAY - HEADLIGHT ECU SUB-ASSEMBLY LH)


    1. Remove the LH LAMP relay from the No. 2 engine room relay block.

    2. Disconnect the B16 headlight ECU sub-assembly LH connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 3 - B16-13 (ECUB) Always Below 1 Ω
      Relay terminal 3 or B16-13 (ECUB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (LH LAMP RELAY - COWL SIDE JUNCTION BLOCK LH)


    1. Remove the LH LAMP relay from the No. 2 engine room relay block.

    2. Disconnect the 5D cowl side junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 1 - 5D-9 Always Below 1 Ω
      Relay terminal 1 or 5D-9 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. A000MTXE02

      Remove the cowl side junction block LH Click here.

    2. Remove the main body ECU from the cowl side junction block LH Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5D-9 - A-15 (HRLY) Always Below 1 Ω

    OK

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

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

  7. CHECK HARNESS AND CONNECTOR (BATTERY - RH LAMP RELAY)


    1. Remove the RH LAMP relay from the No. 2 engine room relay block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Relay terminal 1 - Body ground Power switch off 11 to 14 V
      Relay terminal 5 - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT RH LAMP RELAY


    1. Remove the RH LAMP relay from the No. 2 engine room relay block.

    2. Inspect the RH LAMP relay Click here.


    NG

    REPLACE RH LAMP RELAY

    OK

  9. CHECK HARNESS AND CONNECTOR (RH LAMP RELAY - HEADLIGHT ECU SUB-ASSEMBLY RH)


    1. Remove the RH LAMP relay from the No. 2 engine room relay block.

    2. Disconnect the B15 headlight ECU sub-assembly RH connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 3 - B15-13 (ECUB) Always Below 1 Ω
      Relay terminal 3 or B15-13 (ECUB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (RH LAMP RELAY - COWL SIDE JUNCTION BLOCK LH)


    1. Remove the RH LAMP relay from the No. 2 engine room relay block.

    2. Disconnect the 5D cowl side junction block LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 2 - 5D-21 Always Below 1 Ω
      Relay terminal 2 or 5D-21 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. INSPECT COWL SIDE JUNCTION BLOCK LH


    1. A000NSSE02
      *1 DIM

      Remove the cowl side junction block LH Click here.

    2. Remove the main body ECU from the cowl side junction block LH Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5D-21 - A-22 (DIM) Always Below 1 Ω

    OK

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

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here