METER / GAUGE SYSTEM TERMINALS OF ECU


  1. COMBINATION METER ASSEMBLY

    B006X3PN07

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

      Terminal No. (Symbol) Wiring Color Signal Input/Output Condition Specified Condition
      K21-1 (ILL-) - Body ground LA-L - Body ground Output Headlight dimmer switch off → Headlight dimmer switch in tail or head position Below 1 V → Pulse generation
      K21-2 (EP) - Body ground W-B - Body ground - Always Below 1 Ω
      K21-4 (INT)*6 - Body ground L - Body ground Output

      • Ignition switch ON

      • Steering pad switch assembly operated, "TPWS" selected on the multi-information display and "OK" switch (steering pad switch assembly) pressed and held → "OK" switch (steering pad switch assembly) off

      		 Below 1.5 V → 8 to 15 V
      K21-5 (SI) - Body ground W - Body ground Input Ignition switch ON, wheel being rotated Pulse generation (See waveform 1)
      K21-6 (+S) - Body ground L - Body ground Output Ignition switch ON, wheel being rotated Pulse generation (See waveform 1)
      K21-7 (VCM)*1, *4 - Body ground BE - Body ground Input Engine started, vacuum warning switch off (brake warning light off) → Vacuum warning switch on (brake warning light on) 11 to 14 V → Below 1 V
      K21-9 (S)*1, *3 - Body ground LA-R - Body ground Input Engine not started → Engine started Below 1 V → 11 to 14 V
      K21-10 (PBKL)*7, *12 - Body ground

      • B - Body ground*10

      • G - Body ground*11

      		 Input Ignition switch ON, front passenger seat belt unfastened → Fastened Below 1 V → 11 to 14 V
      K21-11 (PODS)*7, *12 - Body ground L - Body ground Input Ignition switch ON, front passenger seat not occupied → occupied 11 to 14 V → Below 1 V
      K21-12 (SW) - Body ground G - Body ground Input Ignition switch ON, brake fluid level not low (brake warning light off) → Brake fluid level low (brake warning light on) 11 to 14 V → Below 1 V
      K21-14 (FR) - K21-33 (FE) LG - BE Input Ignition switch ON, fuel level full → Fuel level low (fuel level warning light on) 4.2 to 4.6 V → 0.3 to 0.6 V
      K21-15 (FV) - Body ground GR - Body ground Input Ignition switch off → Ignition switch ON Below 1 V → 4.5 to 5.5 V
      K21-17 (WLVL)*8 - Body ground LG - Body ground Input Ignition switch ON, washer fluid level not low → Washer fluid level low 11 to 14 V → Below 1 V
      K21-18 (RLMT)*2 -Body ground BE - Body ground Output Ignition switch ON, rear seat belt warning light LH off → Rear seat belt warning light LH on 11 to 14 V → Below 1 V
      K21-19 (RCMT)*2 -Body ground R - Body ground Output Ignition switch ON, rear seat belt warning light center off → Rear seat belt warning light center on 11 to 14 V → Below 1 V
      K21-20 (RRMT)*2 -Body ground G - Body ground Output Ignition switch ON, rear seat belt warning light RH off → Rear seat belt warning light RH on 11 to 14 V → Below 1 V
      K21-21 (ES) - Body ground W-B - Body ground - Always Below 1 Ω
      K21-22 (ECU)*5 - Body ground BE - Body ground Output

      • Ignition switch ON

      • "OPEN" or "CLOSE" selected on "Rear Sunshade" screen of multi-information display and "OK" switch (steering pad switch assembly) pressed → "OK" switch (steering pad switch assembly) not pressed

      		 Below 1 V → 5.5 V or higher
      K21-24 (RLSB)*2 - Body ground SB - Body ground Input Ignition switch ON, rear seat belt LH unfastened → Fastened Below 1 V → 11 to 14 V
      K21-25 (RCSB)*2 - Body ground B - Body ground Input Ignition switch ON, rear seat belt center unfastened → Fastened Below 1 V → 11 to 14 V
      K21-26 (RRSB)*2 - Body ground LG - Body ground Input Ignition switch ON, rear seat belt RH unfastened → Fastened Below 1 V → 11 to 14 V
      K21-27 (OILW)*1, *4 - Body ground W - Body ground Input Ignition switch ON, engine oil level not low → Engine oil level low Below 1 V → 11 to 14 V
      K21-28 (MSM+) - Body ground GR - Body ground Input Ignition switch ON, UP, DOWN, RIGHT and LEFT switches on steering pad switch assembly not pushed 4.8 to 5.2 V
      K21-29 (MSTI) - Body ground R - Body ground Input Ignition switch ON, OK and BACK switches on steering pad switch assembly not pushed 4.8 to 5.2 V
      K21-31 (CANL) W Input/Output - -
      K21-32 (CANH) B Input/Output - -
      K21-36 (TX+)*9 G Input/Output - -
      K21-37 (TX-)*9 W Input/Output - -
      K21-39 (IG+) - Body ground LA-GR - Body ground Input Ignition switch off → Ignition switch ON Below 1 V → 11 to 14 V
      K21-40 (B) - Body ground LA-B - Body ground Input Always 11 to 14 V
      K20-1 (ODO) - Body ground LA-L - Body ground Input Ignition switch ON, ODO/TRIP switch (trip switch) not pushed 4.8 to 5.2 V
      K20-2 (TR) - Body ground L - Body ground Input Ignition switch ON, light control rheostat up switch (trip switch) and light control rheostat down switch (trip switch) not pushed 4.8 to 5.2 V
      K20-3 (HAZ) - Body ground LA-R - Body ground Input Hazard warning signal switch off → Hazard warning signal switch pushed 11 to 14 V → Below 1 V
      K20-5 (SW3) - Body ground LA-B - Body ground - Always Below 1 Ω
      K20-7 (LR) - Body ground LA-G - Body ground Output Ignition switch ON, RH turn indicator light off → RH turn indicator light blinking Below 1 V → 11 to 14 V ←→ Below 1 V
      K20-8 (B) - Body ground LA-B - Body ground Input Always 11 to 14 V
      K20-10 (TRNL) - Body ground BE - Body ground Output Ignition switch ON, LH turn indicator light off → LH turn indicator light blinking Below 1 V → 11 to 14 V ←→ Below 1 V
      K20-11 (LL) - Body ground LA-LG - Body ground Output Ignition switch ON, LH turn indicator light off → LH turn indicator light blinking Below 1 V → 11 to 14 V ←→ Below 1 V
      K20-13 (TRNR) - Body ground BE - Body ground Output Ignition switch ON, RH turn indicator light off → RH turn indicator light blinking Below 1 V → 11 to 14 V ←→ Below 1 V

      • *1: for 2GR-FKS

      • *2: w/ Rear Seat Belt Warning

      • *3: for 2AR-FE

      • *4: for A25A-FKS

      • *5: w/ Rear Sunshade System

      • *6: w/ Tire Pressure Warning System

      • *7: w/o Occupant Classification System

      • *8: w/ Level Warning Switch

      • *9: w/ No. 1 Stereo Jack Adapter Assembly

      • *10: for LHD

      • *11: for RHD

      • *12: w/ Front Passenger Seat Belt Warning System


      • B0070NSN02

        Waveform 1:

        Item Condition
        Tester connection

        • K21-5 (SI) - Body ground

        • K21-6 (+S) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Ignition switch ON, wheel being rotated

        Tech Tips

        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.