LIGHTING SYSTEM TERMINALS OF ECU


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

    B003YD6N10

    1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

    2. Measure the voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. Wiring Color Terminal Description Condition Specified Condition
      4E-1 - Body ground B - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      4F-1 - Body ground L - Body ground Auxiliary battery power supply Power switch off 11 to 14 V

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

    3. Measure the resistance on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4B-7 - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    4. Reconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

    5. Measure the voltage and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      4B-19 - Body ground P - Body ground ACC power supply Power switch on (ACC) 11 to 14 V
      Power switch off Below 1 V
      4C-22 - Body ground V - Body ground IG power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      4D-27 - Body ground B - Body ground Front door inside handle light LH power supply Power switch off 11 to 14 V
      4B-15 - Body ground B - Body ground Front door inside handle light RH power supply Power switch off 11 to 14 V
      4D-31 - Body ground L - Body ground Courtesy light LH and No. 1 luggage compartment light power supply DOME CUT relay on 11 to 14 V
      DOME CUT relay off Below 1 V
      4B-18 - Body ground L - Body ground No. 1 interior illumination lights and courtesy light RH power supply DOME CUT relay on 11 to 14 V
      DOME CUT relay off Below 1 V
      4B-16 - Body ground R - Body ground Map light assembly and vanity lights power supply DOME CUT relay on 11 to 14 V
      DOME CUT relay off Below 1 V
      4B-10 - Body ground LG - Body ground Interior lights drive output Interior lights off (when operated by illuminated entry system) 11 to 14 V
      Interior lights on (when operated by illuminated entry system) Below 1 V
      4B-11 - Body ground R - Body ground No. 1 interior illumination lights drive output No. 1 interior illumination lights off (when operated by illuminated entry system) 11 to 14 V
      No. 1 interior illumination lights on (when operated by illuminated entry system) Below 1 V
      K1-27 (DMDR) - Body ground L - Body ground Door switch signal input Door switch on Below 1 V
      Door switch off Pulse generation
      K1-28 (DMON) - Body ground W - Body ground Front dome light switch signal input Front dome light switch on Below 1 V
      Front dome light switch off Pulse generation
      K2-25(TCYL) - Body ground R - Body ground Luggage compartment room light drive input No. 1 luggage compartment light off 11 to 14 V
      No. 1 luggage compartment light on Below 1 V
      K2-6 (FLCY) - Body ground V - Body ground Front door courtesy light switch LH input Front door LH open Below 1 V
      Front door LH closed 11 to 14 V
      K2-27 (FRCY) - Body ground V - Body ground Front door courtesy light switch RH input Front door RH open Below 1 V
      Front door RH closed 11 to 14 V
      4D-25 - Body ground BE - Body ground Rear door courtesy light switch LH input Rear door LH open Below 1 V
      Rear door LH closed Pulse generation
      4B-17 - Body ground BE - Body ground Rear door courtesy light switch RH input Rear door RH open Below 1 V
      Rear door RH closed Pulse generation
      4D-16 - Body ground G - Body ground Luggage compartment door courtesy switch input Luggage compartment door open Below 1 V
      Luggage compartment door closed 11 to 14 V
      4B-26 - Body ground G - Body ground Front door unlock detection switch LH input Front door LH locked Pulse generation
      Front door LH unlocked Below 1 V
      4B-27 - Body ground B - Body ground Front door unlock detection switch RH input Front door RH locked Pulse generation
      Front door RH unlocked Below 1 V
      4B-23 - Body ground L - Body ground Rear door unlock detection switch LH input Rear door LH locked Pulse generation
      Rear door LH unlocked Below 1 V
      K1-2 (LSWR) - Body ground W - Body ground Rear door unlock detection switch RH input Rear door RH locked Pulse generation
      Rear door RH unlocked Below 1 V
      K1-17 (FRCL) - Body ground G - Body ground Courtesy light RH drive output Courtesy light RH off 11 to 14 V
      Courtesy light RH on Below 1 V
      K1-1 (FLCL) - Body ground V - Body ground Courtesy light LH drive output Courtesy light LH off 11 to 14 V
      Courtesy light LH on Below 1 V
      4B-22 - Body ground W - Body ground Front door inside handle illumination light RH drive output Front door inside handle illumination light RH off 11 to 14 V
      Front door inside handle illumination light RH on Below 1 V
      4D-26 - Body ground W - Body ground Front door inside handle illumination light LH drive output Front door inside handle illumination light LH off 11 to 14 V
      Front door inside handle illumination light LH on Below 1 V

      If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.

  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A01MRXYN89

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K137-17 (SWIL) - K137-12 (AGND) R - LG Power switch illumination drive output Power switch illumination on 11 to 14 V
      Power switch illumination off Below 1 V

      • If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.