FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) TERMINALS OF ECU


  1. CHECK POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT)

    B0086L2C02
    *A for LHD *B for RHD

    1. for LHD


      1. Disconnect the b23 and b25 position control ECU assembly (driver seat) connectors.

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

        Tech Tips

        Measure the values on the wire harness side with the connector disconnected.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        b23-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        b23-3 (+B) - Body ground W - Body ground Battery power supply Always 11 to 14 V
        b25-1 (IG) - Body ground P - Body ground Ignition power supply Engine switch off Below 1 V
        Engine switch on (IG) 11 to 14 V
        b25-15 (SYSB) - Body ground G - Body ground System power source Always 11 to 14 V

      3. Reconnect the b23 and b25 position control ECU assembly (driver seat) connectors.

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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        b23-1 (SLD+) - Body ground L - Body ground Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        b23-5 (SLD-) - Body ground GR - Body ground Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        b23-6 (LFT+) - Body ground V - Body ground Rear lifter motor signal (upward) Rear lifter switch off Below 1 V
        Rear lifter switch on (Upward) 11 to 14 V
        b23-7 (FRV+) - Body ground B - Body ground Front vertical motor signal (upward) Front vertical switch off Below 1 V
        Front vertical switch on (Upward) 11 to 14 V
        b23-9 (L+) - Body ground V - Body ground Lumbar support adjuster motor signal (forward) Lumbar support adjuster switch off Below 1 V
        Lumbar support adjuster switch on (Forward) 11 to 14 V
        b23-10 (RCL+) - Body ground P - Body ground Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        b24-3 (L-) - Body ground L - Body ground Lumbar support adjuster motor signal (rearward) Lumbar support adjuster switch off Below 1 V
        Lumbar support adjuster switch on (Rearward) 11 to 14 V
        b24-4 (FRV-) - Body ground R - Body ground Front vertical motor signal (downward) Front vertical switch off Below 1 V
        Front vertical switch on (Downward) 11 to 14 V
        b24-5 (LFT-) - Body ground G - Body ground Lifter motor signal (downward) Rear lifter switch off Below 1 V
        Rear lifter switch on (Downward) 11 to 14 V
        b24-6 (RCL-) - Body ground LG - Body ground Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        b25-4 (LFLF) - Body ground W - Body ground Front power seat switch (driver seat) (lumbar support adjuster switch (forward)) signal Lumbar support adjuster switch off 11 to 14 V
        Lumbar support adjuster switch on (Forward) Below 1 V
        b25-6 (FRVU) - Body ground L - Body ground Front power seat switch (driver seat) (front vertical switch (upward)) signal Front vertical switch off 11 to 14 V
        Front vertical switch on (Upward) Below 1 V
        b25-7 (LFTU) - Body ground BR - Body ground Front power seat switch (driver seat) (rear lifter switch (upward)) signal Rear lifter switch off 11 to 14 V
        Rear lifter switch on (Upward) Below 1 V
        b25-8 (RCLF) - Body ground BR - Body ground Front power seat switch (driver seat) (reclining switch (forward)) signal Reclining switch off 11 to 14 V
        Reclining switch on (Forward) Below 1 V
        b25-9 (SLDF) - Body ground B - Body ground Front power seat switch (driver seat) (slide switch (forward)) signal Slide switch off 11 to 14 V
        Slide switch on (Forward) Below 1 V
        b25-12 (SENG) - Body ground BR - Body ground Sensor ground Always Below 1 Ω
        b25-18 (LFLR) - Body ground L - Body ground Front power seat switch (driver seat) (lumbar support adjuster switch (rearward)) signal Lumbar support adjuster switch off 11 to 14 V
        Lumbar support adjuster switch on (Rearward) Below 1 Ω
        b25-20 (FRVD) - Body ground V - Body ground Front power seat switch (driver seat) (front vertical switch (downward)) signal Front vertical switch off 11 to 14 V
        Front vertical switch on (Downward) Below 1 V
        b25-21 (LFTD) - Body ground LG - Body ground Front power seat switch (driver seat) (rear lifter switch (downward)) signal Rear lifter switch off 11 to 14 V
        Rear lifter switch on (Downward) Below 1 V
        b25-22 (RCLR) - Body ground G - Body ground Front power seat switch (driver seat) (reclining switch (rearward)) signal Reclining switch off 11 to 14 V
        Reclining switch on (Rearward) Below 1 V
        b25-23 (SLDR) - Body ground GR - Body ground Front power seat switch (driver seat) (slide switch (rearward)) signal Slide switch off 11 to 14 V
        Slide switch on (Rearward) Below 1 V

      5. Check for pulses according to the value(s) in the table below.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        b25-10 (SSFV) - Body ground L - Body ground Front vertical position signal Front vertical function operating 4.8 to 5.1 V
        b25-11 (SSRR) - Body ground V - Body ground Reclining position signal Reclining function operating 4.8 to 5.1 V
        b25-25 (SSRL) - Body ground B - Body ground Rear lifter position signal Rear lifter function operating 4.8 to 5.1 V
        b25-26 (SSRS) - Body ground G - Body ground Slide position signal Slide function operating 4.8 to 5.1 V

    2. for RHD


      1. Disconnect the a10 and a12 position control ECU assembly (driver seat) connectors.

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

        Tech Tips

        Measure the values on the wire harness side with the connector disconnected.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        a10-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        a10-3 (+B) - Body ground W - Body ground Battery power supply Always 11 to 14 V
        a12-1 (IG) - Body ground P - Body ground Ignition power supply Engine switch off Below 1 V
        Engine switch on (IG) 11 to 14 V
        a12-15 (SYSB) - Body ground G - Body ground System power source Always 11 to 14 V

      3. Reconnect the a10 and a12 position control ECU assembly (driver seat) connectors.

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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        a10-1 (SLD+) - Body ground L - Body ground Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        a10-5 (SLD-) - Body ground GR - Body ground Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        a10-6 (LFT+) - Body ground V - Body ground Rear lifter motor signal (upward) Rear lifter switch off Below 1 V
        Rear lifter switch on (Upward) 11 to 14 V
        a10-7 (FRV+) - Body ground B - Body ground Front vertical motor signal (upward) Front vertical switch off Below 1 V
        Front vertical switch on (Upward) 11 to 14 V
        a10-9 (L+) - Body ground V - Body ground Lumbar support adjuster motor signal (forward) Lumbar support adjuster switch off Below 1 V
        Lumbar support adjuster switch on (Forward) 11 to 14 V
        a10-10 (RCL+) - Body ground P - Body ground Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        a11-3 (L-) - Body ground L - Body ground Lumbar support adjuster motor signal (rearward) Lumbar support adjuster switch off Below 1 V
        Lumbar support adjuster switch on (Rearward) 11 to 14 V
        a11-4 (FRV-) - Body ground R - Body ground Front vertical motor signal (downward) Front vertical switch off Below 1 V
        Front vertical switch on (Downward) 11 to 14 V
        a11-5 (LFT-) - Body ground G - Body ground Lifter motor signal (downward) Rear lifter switch off Below 1 V
        Rear lifter switch on (Downward) 11 to 14 V
        a11-6 (RCL-) - Body ground LG - Body ground Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        a12-4 (LFLF) - Body ground W - Body ground Front power seat switch (driver seat) (lumbar support adjuster switch (forward)) signal Lumbar support adjuster switch off 11 to 14 V
        Lumbar support adjuster switch on (Forward) Below 1 V
        a12-6 (FRVU) - Body ground L - Body ground Front power seat switch (driver seat) (front vertical switch (upward)) signal Front vertical switch off 11 to 14 V
        Front vertical switch on (Upward) Below 1 V
        a12-7 (LFTU) - Body ground BR - Body ground Front power seat switch (driver seat) (rear lifter switch (upward)) signal Rear lifter switch off 11 to 14 V
        Rear lifter switch on (Upward) Below 1 V
        a12-8 (RCLF) - Body ground BR - Body ground Front power seat switch (driver seat) (reclining switch (forward)) signal Reclining switch off 11 to 14 V
        Reclining switch on (Forward) Below 1 V
        a12-9 (SLDF) - Body ground B - Body ground Front power seat switch (driver seat) (slide switch (forward)) signal Slide switch off 11 to 14 V
        Slide switch on (Forward) Below 1 V
        a12-12 (SENG) - Body ground BR - Body ground Sensor ground Always Below 1 Ω
        a12-18 (LFLR) - Body ground L - Body ground Front power seat switch (driver seat) (lumbar support adjuster switch (rearward)) signal Lumbar support adjuster switch off 11 to 14 V
        Lumbar support adjuster switch on (Rearward) Below 1 Ω
        a12-20 (FRVD) - Body ground V - Body ground Front power seat switch (driver seat) (front vertical switch (downward)) signal Front vertical switch off 11 to 14 V
        Front vertical switch on (Downward) Below 1 V
        a12-21 (LFTD) - Body ground LG - Body ground Front power seat switch (driver seat) (rear lifter switch (downward)) signal Rear lifter switch off 11 to 14 V
        Rear lifter switch on (Downward) Below 1 V
        a12-22 (RCLR) - Body ground G - Body ground Front power seat switch (driver seat) (reclining switch (rearward)) signal Reclining switch off 11 to 14 V
        Reclining switch on (Rearward) Below 1 V
        a12-23 (SLDR) - Body ground GR - Body ground Front power seat switch (driver seat) (slide switch (rearward)) signal Slide switch off 11 to 14 V
        Slide switch on (Rearward) Below 1 V

      5. Check for pulses according to the value(s) in the table below.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        a12-10 (SSFV) - Body ground L - Body ground Front vertical position signal Front vertical function operating 4.8 to 5.1 V
        a12-11 (SSRR) - Body ground V - Body ground Reclining position signal Reclining function operating 4.8 to 5.1 V
        a12-25 (SSRL) - Body ground B - Body ground Rear lifter position signal Rear lifter function operating 4.8 to 5.1 V
        a12-26 (SSRS) - Body ground G - Body ground Slide position signal Slide function operating 4.8 to 5.1 V

  2. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR)

    B0086F6C32
    *A for LHD *B for RHD

    1. for LHD


      1. Disconnect the O8 outer mirror control ECU assembly (driver door) connector.

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

        Tech Tips

        Measure the values on the wire harness side with the connector disconnected.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        O8-6 (CPUB) - O8-7 (GND) LA-L - W-B Battery power supply Always 11 to 14 V
        O8-14 (BDR) - O8-7 (GND) GR - W-B Battery power supply Always 11 to 14 V
        O8-5 (SIG) - O8-7 (GND) LA-B - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        O8-5 (SIG) - O8-7 (GND) LA-B - W-B Ignition power supply Always Below 1 V
        O8-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      3. Reconnect the O8 outer mirror control ECU assembly (driver door) connector.

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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        O8-1 (MM) - O8-7 (GND) GR - W-B SET switch signal for seat memory switch (driver door) SET switch on Below 1 V
        SET switch off 11 to 14 V
        O8-2 (M1) - O8-7 (GND) BR - W-B M1 switch signal for seat memory switch (driver door) M1 switch on Below 1 V
        M1 switch off 11 to 14 V
        O8-3 (M2) - O8-7 (GND) R - W-B M2 switch signal for seat memory switch (driver door) M2 switch on Below 1 V
        M2 switch off 11 to 14 V

    2. for RHD


      1. Disconnect the N9 outer mirror control ECU assembly (driver door) connector.

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

        Tech Tips

        Measure the values on the wire harness side with the connector disconnected.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        N9-6 (CPUB) - N9-7 (GND) LA-L - W-B Battery power supply Always 11 to 14 V
        N9-14 (BDR) - N9-7 (GND) GR - W-B Battery power supply Always 11 to 14 V
        N9-5 (SIG) - N9-7 (GND) LA-B - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        N9-5 (SIG) - N9-7 (GND) LA-B - W-B Ignition power supply Always Below 1 V
        N9-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      3. Reconnect the N9 outer mirror control ECU assembly (driver door) connector.

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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        N9-1 (MM) - N9-7 (GND) GR - W-B SET switch signal for seat memory switch (driver door) SET switch on Below 1 V
        SET switch off 11 to 14 V
        N9-2 (M1) - N9-7 (GND) BR - W-B M1 switch signal for seat memory switch (driver door) M1 switch on Below 1 V
        M1 switch off 11 to 14 V
        N9-3 (M2) - N9-7 (GND) R - W-B M2 switch signal for seat memory switch (driver door) M2 switch on Below 1 V
        M2 switch off 11 to 14 V

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


    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Click here

      B0086F2C22
      *A for LHD *B for RHD

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

      Tech Tips

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      MB-31 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply Engine switch on (IG) 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply Engine switch off Below 1 V
      MB-30 (ACC) - Body ground - Ignition power supply Engine switch on (ACC) 11 to 14 V
      MB-30 (ACC) - Body ground - Ignition power supply Engine switch off Below 1 V
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      K52-1 (FLCY) - Body ground W - Body ground Front door courtesy light switch assembly (LH) input Front door LH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      K52-6 (FRCY) - Body ground BE - Body ground Front door courtesy light switch assembly (RH) input Front door RH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω