POWER INTEGRATION SYSTEM TERMINALS OF ECU

Note


  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

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  1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

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      B000YCPC11
      *1 Main Body ECU (Multiplex Network Body ECU) - -

    2. Connect the driver side junction block assembly.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      A-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω
      A-31 (BECU) - Body ground None - Body ground Battery power supply Always 11 to 14 V
      A-30 (ACC) - Body ground None - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V
      Engine switch off Below 1 V
      A-32 (IG) - Body ground None - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V

  2. CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU

    B000UFXC06
    *a

    Component without harness connected

    (No. 1 semiconductor power integration ECU)

    		 - -

    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the A79 and A80 No. 1 semiconductor power integration ECU connectors.

    3. Connect the cable to the negative (-) battery terminal.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A79-1 (+B) - Body ground R - Body ground Battery power supply Always 8 to 14 V
      A80-1 (L) - Body ground G - Body ground No. 1 headlight ECU sub-assembly LH power supply Engine switch off Below 3 V
      Engine switch on (IG) 8 V or higher
      A80-2 (HI) - Body ground R - Body ground No. 1 headlight ECU sub-assembly RH power supply Engine switch off Below 3 V
      Engine switch on (IG) 8 V or higher
      A80-6 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A80-9 (IG) - Body ground L - Body ground Ignition power supply Engine switch off Below 1.5 V
      Engine switch on (IG) 8 to 14 V
      A80-13 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A80-14 (-S) - Body ground R - Body ground No. 1 headlight ECU sub-assembly operation signal input Engine switch off 6 V or higher
      Engine switch on (IG) Below 1.5 V
      A80-15 (-S) - Body ground V - Body ground No. 1 headlight ECU sub-assembly operation signal input Engine switch off 6 V or higher
      Engine switch on (IG) Below 1.5 V

  3. CHECK NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU

    B000UFXC08
    *a

    Component without harness connected

    (No. 3 semiconductor power integration ECU)

    		 - -

    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the b11 and X99 No. 3 semiconductor power integration ECU connectors.

    3. Connect the cable to the negative (-) battery terminal.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      b11-1 (+B) - Body ground B - Body ground Battery power supply Always 8 to 14 V
      X99-1 (OUT) - Body ground W - Body ground Stop lights, high mounted stop light output Brake pedal released Below 3 V
      Brake pedal depressed 8 V or higher
      X99-2 (L) - Body ground R - Body ground Window defogger output Engine switch on (IG), window defogger switch off Below 3 V
      Engine switch on (IG), window defogger switch on 8 V or higher
      X99-4 (L) - Body ground LA-R - Body ground Back-up output Engine running, shift lever in any position other than R Below 3 V
      Engine running, shift lever in R 8 V or higher
      X99-6 (GND2) - Body ground LA - Body ground Ground Always Below 1 Ω
      X99-9 (IG) - Body ground LA-B - Body ground Ignition power supply Engine switch off Below 1.5 V
      Engine switch on (IG) 8 to 14 V
      X99-10 (STP) - Body ground R - Body ground Stop lights operation signal input Brake pedal released Below 1.5 V
      Brake pedal depressed 6 V or higher
      X99-11 (+S) - Body ground L - Body ground Back-up light operation signal input Engine running, shift lever in any position other than R Below 1.5 V
      Engine running, shift lever in R 6 V or higher
      X99-13 (GND1) - Body ground LA - Body ground Ground Always Below 1 Ω
      X99-14 (ACC) - Body ground BE - Body ground ACC stop lights operation signal input Engine switch off 6 V or higher
      Engine switch on (IG) Below 1.5 V
      X99-16 (L) - Body ground LA-P - Body ground Rear taillights output Rear taillights not illuminated Below 3 V
      Rear taillights illuminated 8 V or higher