LIGHTING SYSTEM TERMINALS OF ECU

  1. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    U123812E04
    U123817E04

    1. Disconnect the DB, DE, DH and H80 main body ECU connectors.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      DH-12 (BECU) - Body ground

      B - Body ground

      Battery power supply

      Always

      11 to 14 V

      DE-28 (GND1) - Body ground

      W-B - Body ground

      Body ground

      Always

      Below 1 Ω

      H80-4 (GND2) - Body ground

      W-B - Body ground

      Body ground

      Always

      Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the DB, DE and H80 main body ECU connectors.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      DK-2 (ILE) - DE-28 (GND1)

      W - W-B

      Interior light signal

      Interior light on

      Below 1 V

      Interior light off

      11 to 14 V

      H79-2 (FSPT) - DE-28 (GND1)

      W-B - W-B

      No. 1 interior illumination light signal

      No. 1 interior illumination light illumination on

      Below 1 V

      No. 1 interior illumination light illumination off

      11 to 14 V

      H79-8 (LCTY) - DE-28 (GND1)

      SB - W-B

      Rear door courtesy light switch signal

      (Rear left door)

      Rear left door open

      Below 1 V

      Rear left door closed

      11 to 14 V

      DA-21 (DCTY) - DE-28 (GND1)*1

      DC-6 (DCTY) - DE-28 (GND1)*2

      W - W-B*1

      BR - W-B*2

      Front door courtesy light switch signal

      (Driver side door)

      Driver side door open

      Below 1 V

      Driver side door closed

      11 to 14 V

      DE-19 (RCTY) - DE-28 (GND1)

      LG - W-B

      Rear door courtesy light switch signal

      (Rear right door)

      Rear right door open

      Below 1 V

      Rear right door closed

      11 to 14 V

      DE-20 (PCTY) - DE-28 (GND1)*1

      DA-24 (PCTY) - DE-28 (GND1)*2

      BR - W-B*1

      W - W-B*2

      Front door courtesy light switch signal

      (Front passenger side door)

      Front passenger side door open

      Below 1 V

      Front passenger side door closed

      11 to 14 V

      DA-7 (BCTY) - DE-28 (GND1)

      LG - W-B

      Back door courtesy light switch signal

      Back door open

      Below 1 V

      Back door closed

      11 to 14 V

      H79-19 (DOMR) - DE-28 (GND1)*1

      H79-3 (DOMR) - DE-28 (GND1)*2

      P - W-B

      Battery saving control (interior light auto cut function) signal

      Battery saving control (interior light auto cut function) operating

      11 to 14 V

      Battery saving control (interior light auto cut function) not operating

      Below 1 V

      H79-25 (LSWD) - DE-28 (GND1)

      Y - W-B*1

      LG - W-B*2

      Front door unlock detection switch signal

      (Driver side door)

      Driver side door locked

      Pulse generation

      Driver side door unlocked

      Below 1 V

      H79-10 (LSWP) - DE-28 (GND1)

      LG - W-B

      Front door unlock detection switch signal

      (Front passenger side door)

      Front passenger side door locked

      Pulse generation

      Front passenger side door unlocked

      Below 1 V

      H81-10 (LSR) - DE-28 (GND1)

      Y - W-B

      LH and RH side rear door unlock detection switch signal

      LH and RH side rear door locked

      Pulse generation

      LH or RH side rear door unlocked

      Below 1 V

      • *1: for LHD

      • *2: for RHD