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Terminals Of Ecu [09/2012 - ]

  1. CHECK NO. 1 METER ECU 
    Fig 1: No. 1 Meter ECU Connector Terminal Identification
    GTY138155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance and voltage according to the value(s) in the table below.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L10-1 (B) - Body ground G - Body ground Turn indicator light LH signal Power switch on (IG), turn indicator light LH off Below 1 V
      Power switch on (IG), turn indicator light LH on Alternating between below 1 and 11 to 14 V
      L10-4 (A/B) - Body ground B - Body ground ODO/TRIP switch signal Power switch on (IG), ODO/TRIP switch on Below 1 V
      Power switch on (IG), ODO/TRIP switch off 4.4 to 5.5 V
      L10-5 (RSET) - Body ground BR - Body ground RESET switch signal Power switch on (IG), RESET switch on Below 1 V
      Power switch on (IG), RESET switch off 4.4 to 5.5 V
      L10-6 (FUCI) - Body ground P - Body ground Fuel lid courtesy switch signal Power switch on (IG), fuel lid close Below 1 V
      Power switch on (IG), fuel lid open 11 to 14 V
      L10-7 (RHDW) - Body ground L - Body ground Light control rheostat DOWN switch signal Power switch on (IG), Light control rheostat DOWN switch on Below 1 V
      Power switch on (IG), Light control rheostat DOWN switch off 4.4 to 5.5 V
      L10-8 (RHUP) - Body ground R - Body ground Light control rheostat UP switch signal Power switch on (IG), Light control rheostat UP switch ON Below 1 V
      Power switch on (IG), Light control rheostat UP switch OFF 4.4 to 5.5 V
      L10-9 (SI) - Body ground L - Body ground Speed signal (Input) Driving at approximately 20 km/h (12 mph) Pulse generation (See waveform)
      L10-10 (+S) - Body ground V - Body ground Speed signal (Output) Driving at approximately 20 km/h (12 mph) Pulse generation (See waveform)
      L10-11 (EFI) - Body ground R - Body ground MIL MIL on Below 1 to 4.2 V
      MIL off 11 to 14 V
      L10-12 (B) - Body ground Y - Body ground Turn indicator light RH signal Power switch on (IG), turn indicator light RH off Below 1 V
      Power switch on (IG), turn indicator light RH blinks Alternating between below 1 and 11 to 14 V
      L10-13 (B) - Body ground P - Body ground +B power supply Always 11 to 14 V
      L10-14 (IG2) - Body ground L - Body ground IG power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      L10-16 (ILL-) - Body ground LG - Body ground Illumination signal Power switch on (IG) Pulse generation
      L10-17 (E2) - Body ground W-B - Body ground Ground (Power ground) Always Below 1 Ω
      L10-18 (ES) - Body ground BR - Body ground Ground Always Below 1 Ω
      L10-19 (FUWI) - Body ground V - Body ground Fuel lid opener switch signal Power switch on (IG), fuel lid opener switch off Below 1 V
      Power switch on (IG), fuel lid opener switch on 11 to 14 V
      L10-24 (EPB*) - Body ground L - Body ground Parking brake switch signal Power switch on (IG), parking brake switch on Below 1.5 V
      Power switch on (IG), parking brake switch off 11 to 14 V
      • *: Stands for electric parking brake
    2. Using an oscilloscope, check the waveform.
      Fig 2: Identifying Waveform
      GTY406437Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM (REFERENCE)

      Item Condition
      Terminal No. (Symbols) L10-10 (+S) - Body ground
      L10-9 (SI) - Body ground
      Tool setting 5 V/DIV., 20 msec./DIV.
      Vehicle condition Driving at approximately 20 km/h (12 mph)

      HINT: 

      As vehicle speed increases, the cycle of the signal waveform narrows.

  2. FRONT MULTIPLEX NETWORK LIGHT ECU (FRONT CONTROLLER) 
    Fig 3: Multiplex Network Light ECU Connector Terminal Identification (Front Controller)
    GTY152412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A50 and A52 front controller connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      A52-5 (ALTB) - Body ground L - Body ground +B power supply Always 11 to 14 V
      A52-1 (BATB) - Body ground P - Body ground +B power supply Always 11 to 14 V
      A50-1 (FMB3) - Body ground LG - Body ground +B power supply Always 11 to 14 V
      A50-5 (FMIG) - Body ground Y - Body ground IG power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A50-2 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
    3. Reconnect the A50 and A52 front controller connectors.
    4. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      A52-10 (MOL) - A52-20 (MOLE) L - W Engine oil level sensor signal Engine oil level sensor on Below 1 V
      Engine oil level sensor off 11 to 14 V
      A52-11 (MOPS) - Body ground R - Body ground Engine oil pressure switch signal Power switch on (IG), engine oil pressure warning display on Below 1 V
      Power switch on (IG), engine oil pressure warning display off 11 to 14 V
  3. CHECK LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU) 
    Fig 4: Luggage Room Junction Block Connector Terminal Identification (Rear Junction Block ECU)
    GTY117442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the LA, LD and LG luggage room junction block connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      LA-29 (SG) - Body ground W-B - Body ground Ground Always Below 1 Ω
      LA-43 (PGND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      LD-4 (MPXB) - LA-29 (SG) R - W-B ECU power supply Always 11 to 14 V
      LG-1 (FUEL) - LA-29 (SG) W - W-B +B power supply Always 11 to 14 V
      • If the result is not as specified, there may be a malfunction on the wire harness side.
    3. Reconnect the LA, LD and LG luggage room junction block connectors.
    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
      S61-7 (FR) - Body ground SB - Body ground Fuel level signal Fuel level F Below 1 V
      Fuel level E 4.5 to 9 V
      S61-18 (FE) - Body ground LG - Body ground Ground (Fuel ground) Always Below 1 Ω
  4. CHECK STEERING PAD SWITCH 
    Fig 5: Steering Pad Switch Connector Terminal Identification
    GTY403035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      z74-12 - Body ground R - Body ground +B power supply Always 11 to 14 V
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