DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System (Except 12.3 Inch Display) - Diagnostics - Introduction (3 Of 4) >> METER / GAUGE SYSTEM (except 12.3 Inch Display) >> Terminals Of Ecu [12/2019 - 11/2023] >> Terminals Of Ecu [12/2019 - 11/2023]

Terminals Of Ecu [12/2019 - 11/2023]

  1. COMBINATION METER ASSEMBLY 
    GTY883345Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      H21-1 (ILL-) - Body ground Illumination signal Taillights off → on Below 1 V → Pulse generation
      H21-2 (EP) - Body ground Ground Always Below 1 Ω
      H21-3 (RRBT) - Body ground Rear No. 2 right seat belt status signal Rear seat belt warning light (Rear No. 2 right seat) off → on 11 to 14 V → Below 1 V
      H21-4 (INT) - Body ground Tire pressure warning reset signal Ignition switch ON, OK switch on steering pad switch not pushed 8 to 15 V
      H21-5 (SI) - Body ground Speed signal for other system (Input) Ignition switch ON, wheel being rotated Pulse generation
      (See waveform 1)
      H21-6 (+S) - Body ground Speed signal for other systems (Output) Ignition switch ON, wheel being rotated Pulse generation
      (See waveform 1)
      H21-8 (VCM) - Body ground*2, *4 Vacuum warning switch signal Engine started, vacuum warning switch off (Brake warning light/red (malfunction) off) → on (Brake warning light/red (malfunction) on) 11 to 14 V → Below 1 V
      H21-9 (S) - Body ground*2 Engine oil pressure signal Engine started → not started 11 to 14 V → Below 1 V
      H21-12 (SW) - Body ground*2 Brake fluid level signal Ignition switch ON, brake fluid level not low (Brake warning light/red (malfunction) off) → low (Brake warning light/red (malfunction) on) 11 to 14 V → Below 1 V
      H21-13 (RLBT) - Body ground Rear No. 2 left seat belt status signal Rear seat belt warning light (Rear No. 2 left seat) off → on 11 to 14 V → Below 1 V
      H21-14 (FR) - H21-33 (FE) Fuel level signal Ignition switch ON, fuel level full → low (fuel level warning light on) Pulse generation
      (See waveform 2)
      H21-15 (FV) - Body ground Power source for fuel sender gauge Ignition switch ON Pulse generation
      (See waveform 3)
      H21-17 (WLVL) - Body ground Washer fluid level signal Ignition switch ON, washer fluid level not low → low 11 to 14 V → Below 1 V
      H21-21 (ES) - Body ground Ground Always Below 1 Ω
      H21-23 (RCBT) - Body ground Rear No. 2 center seat belt status signal Rear seat belt warning light (Rear No. 2 center seat) off → on 11 to 14 V → Below 1 V
      H21-24 (RLSB) - Body ground Rear No. 1 left seat belt status signal Rear seat belt warning light (Rear No. 1 left seat) off → on 11 to 14 V → Below 1 V
      H21-25 (RCSB) - Body ground*5 Rear No. 1 center seat belt status signal Rear seat belt warning light (Rear No. 1 center seat) off → on 11 to 14 V → Below 1 V
      H21-26 (RRSB) - Body ground Rear No. 1 right seat belt status signal Rear seat belt warning light (Rear No. 1 right seat) off → on 11 to 14 V → Below 1 V
      H21-27 (OILW) - Body ground Engine oil level signal Ignition switch ON, engine oil level not low → low Below 1 V → 11 to 14 V
      H21-28 (MSM+) - Body ground Steering pad switch signal Ignition switch ON, up, down, left and right switches on steering pad switch not pushed 4.8 to 5.2 V
      H21-29 (MSTI) - Body ground Steering pad switch signal Ignition switch ON, OK and back switches on steering pad switch not pushed 4.8 to 5.2 V
      H21-31 (CANL) CAN communication line - -
      H21-32 (CANH) CAN communication line - -
      H21-33 (FE) - Body ground Ground Always Below 1 Ω
      H21-34 (LST1) - Body ground*1 Fuel lid operation signal Ignition switch OFF 11 to 14 V
      The following message (interrupt display) being displayed on the multi-information display:
      1. Ready to Refuel
      		 Pulse generation
      (See waveform 4)
      The following message (interrupt display) being displayed on the multi-information display:
      1. Close Fuel Lid
      		 Pulse generation
      (See waveform 5)
      The following message (interrupt display) being displayed on the multi-information display:
      1. Please Wait Fuel Door Opening
      		 Pulse generation
      (See waveform 6)
      H21-36 (TX+)*6 Local bus communication line - -
      H21-37 (TX-)*6 Local bus communication line - -
      H21-38 (TWS2) - Body ground*1 Engine coolant temperature switch signal for exhaust heat recirculation system Idling, engine coolant temperature 75 to 100°C (167 to 212°F) 11 to 14 V
      H21-39 (IG+) - Body ground Ignition switch signal Ignition switch off → Ignition switch ON
      • Below 1 V → 10.5 to 16 V*3
      • Below 1 V → 11 to 14 V*4
      H21-40 (B) - Body ground Auxiliary battery
      • Ignition switch off*1
      • Always*2
      		 11 to 14 V
      H22-1 (ODO) - Body ground ODO/TRIP switch signal Ignition switch ON, ODO/TRIP switch not pushed 4.8 to 5.2 V
      H22-2 (TR) - Body ground Light control rheostat switch signal Ignition switch ON, light control rheostat up switch and light control rheostat down switch not pushed 4.8 to 5.2 V
      H22-3 (HAZ) - Body ground Hazard warning signal switch signal Hazard warning signal switch off → pushed 11 to 14 V → Below 1 V
      H22-5 (SW3) - Body ground Ground for trip switch Always Below 1 Ω
      H22-7 (LR) - Body ground RH turn switch signal Turn indicator light (RH) off → blinking Below 1 V → 11 to 14 V ←→ Below 1 V
      H22-8 (B) - Body ground Auxiliary battery
      • Ignition switch off*1
      • Always*2
      		 11 to 14 V
      H22-10 (TRNL) - Body ground LH turn switch signal Turn indicator light (LH) off → blinking Below 1 V → 11 to 14 V ←→ Below 1 V
      H22-11 (LL) - Body ground LH turn switch signal Turn indicator light (LH) off → blinking Below 1 V → 11 to 14 V ←→ Below 1 V
      H22-13 (TRNR) - Body ground RH turn switch signal Turn indicator light (RH) off → blinking Below 1 V → 11 to 14 V ←→ Below 1 V
      1. *1: for HV Model
      2. *2: for Gasoline Model
      3. *3: w/ Stop and Start System
      4. *4: w/o Stop and Start System
      5. *5: for 60/40 Split Type Rear No. 1 Seat
      6. *6: w/ Audio Tab Display
      1. WAVEFORM 1:

        Item Condition
        Tester connection
        • H21-5 (SI) - Body ground
        • H21-6 (+S) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Ignition switch ON, wheel being rotated
        GTY436923Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

      2. WAVEFORM 2:

        Item Condition
        Tester connection H21-14 (FR) - H21-33 (FE)
        Tool setting 2.5 V/DIV., 20 ms./DIV.
        Condition Ignition switch ON, fuel level full → low (fuel level warning light on)
        GTY776691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        (A) varies depending on the fuel level.

        • Fuel level full: 4.2 to 4.6 V
        • Fuel level low (fuel level warning light on): 0.3 to 1.0 V
      3. GTY801514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM 3:

        Item Condition
        Tester connection H21-15 (FV) - Body ground
        Tool setting 2.5 V/DIV., 20 ms./DIV.
        Condition Ignition switch ON
        Specified Condition 4.5 to 5.5 V
      4. GTY704448Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM 4:

        Item Condition
        Tester Connection H21-34 (LST1) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition The following message (interrupt display) being displayed on the multi-information display:
        1. Ready to Refuel
      5. WAVEFORM 5:

        Item Condition
        Tester Connection H21-34 (LST1) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition The following message (interrupt display) being displayed on the multi-information display:
        1. Close Fuel Lid
        GTY734467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        This waveform is output when the fuel lid opener switch is operated if the fuel lid is open and any of the following conditions are met:

        • The vehicle has been driven for 1 km (0.6 mile) or more at a speed of 50 km/h (31 mph) or more.
        • 30 minutes or more have elapsed since the fuel lid opener switch was operated.
      6. WAVEFORM 6:

        Item Condition
        Tester Connection H21-34 (LST1) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition The following message (interrupt display) being displayed on the multi-information display:
        1. Please Wait Fuel Door Opening
        GTY787551Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        This waveform is output when the internal pressure of the fuel tank is higher than the ambient pressure when the fuel lid opener switch is operated.

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