FRONT POWER SEAT CONTROL SYSTEM TERMINALS OF ECU


  1. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT)


    1. for LHD

      A01F7V1N05

      1. Disconnect the b4 and b5 position control ECU and switch 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.

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        b4-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        b4-7 (+B) - b4-2 (GND) W - W-B Battery power supply Always 11 to 14 V
        b5-12 (SYSB) - b4-2 (GND) P - W-B System power source Always 11 to 14 V
        b5-3 (IG) - b4-2 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        b5-3 (IG) - b4-2 (GND) R - W-B Ignition power supply Engine switch off Below 1 V
        b5-10 (DBCL) - Body ground GR - Body ground Driver seat belt buckle switch signal Driver seat belt fastened Below 1 Ω
        b5-10 (DBCL) - Body ground GR - Body ground Driver seat belt buckle switch signal Driver seat belt unfastened 10 kΩ or higher

      3. Reconnect the b4 and b5 position control ECU and switch assembly (driver seat) connectors.

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

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        b4-6 (+B2) - b4-2 (GND) SB - W-B Lumbar support adjuster power source Always 11 to 14 V
        b4-1 (GND2) - Body ground W-B - Body ground Lumbar support adjuster ground Always Below 1 Ω
        b4-3 (SLD+) - b4-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        b4-4 (SLD-) - b4-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        b4-5 (FRV-) - b4-2 (GND) R - W-B Front vertical motor signal (downward) Front vertical switch off Below 1 V
        Front vertical switch on (Downward) 11 to 14 V
        b4-8 (FRV+) - b4-2 (GND) B - W-B Front vertical motor signal (upward) Front vertical switch off Below 1 V
        Front vertical switch on (Upward) 11 to 14 V
        b4-9 (RCL+) - b4-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        b4-11 (RCL-) - b4-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        b4-10 (LFT+) - b4-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
        Lifter switch on (Upward) 11 to 14 V
        b4-12 (LFT-) - b4-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
        Lifter switch on (Downward) 11 to 14 V
        b5-1 (SGND) - b4-2 (GND) BR - W-B Position sensor ground Always Below 1 Ω
        b5-5 (SSRS) - b5-1 (SGND) G- BR Slide position signal Slide function operating 4.8 to 5.1 V

    2. for RHD

      A01F819N06

      1. Disconnect the a4 and a5 position control ECU and switch 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.

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        a4-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        a4-7 (+B) - a4-2 (GND) W - W-B Battery power supply Always 11 to 14 V
        a5-12 (SYSB) - a4-2 (GND) P - W-B System power source Always 11 to 14 V
        a5-3 (IG) - a4-2 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        a5-3 (IG) - a4-2 (GND) R - W-B Ignition power supply Engine switch off Below 1 V
        a5-10 (DBCL) - Body ground GR - Body ground Driver seat belt buckle switch signal Driver seat belt fastened Below 1 Ω
        a5-10 (DBCL) - Body ground GR - Body ground Driver seat belt buckle switch signal Driver seat belt unfastened 10 kΩ or higher

      3. Reconnect the a4 and a5 position control ECU and switch assembly (driver seat) connectors.

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

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        a4-6 (+B2) - a4-2 (GND) SB - W-B Lumbar support adjuster power source Always 11 to 14 V
        a4-1 (GND2) - Body ground W-B - Body ground Lumbar support adjuster ground Always Below 1 Ω
        a4-3 (SLD+) - a4-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        a4-4 (SLD-) - a4-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        a4-5 (FRV-) - a4-2 (GND) R - W-B Front vertical motor signal (downward) Front vertical switch off Below 1 V
        Front vertical switch on (Downward) 11 to 14 V
        a4-8 (FRV+) - a4-2 (GND) B - W-B Front vertical motor signal (upward) Front vertical switch off Below 1 V
        Front vertical switch on (Upward) 11 to 14 V
        a4-9 (RCL+) - a4-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        a4-11 (RCL-) - a4-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        a4-10 (LFT+) - a4-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
        Lifter switch on (Upward) 11 to 14 V
        a4-12 (LFT-) - a4-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
        Lifter switch on (Downward) 11 to 14 V
        a5-1 (SGND) - a4-2 (GND) BR - W-B Position sensor ground Always Below 1 Ω
        a5-5 (SSRS) - a5-1 (SGND) G- BR Slide position signal Slide function operating 4.8 to 5.1 V

  2. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT)


    1. for LHD

      A01F819N08

      1. Disconnect the a4 and a5 position control ECU and switch assembly (front passenger 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.

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        a4-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        a4-7 (+B) - a4-2 (GND) W - W-B Battery power supply Always 11 to 14 V
        a5-12 (SYSB) - a4-2 (GND) P - W-B System power source Always 11 to 14 V
        a5-3 (IG) - a4-2 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        a5-3 (IG) - a4-2 (GND) R - W-B Ignition power supply Engine switch off Below 1 V
        a5-10 (PBCL) - Body ground GR - Body ground Front passenger seat belt buckle switch signal Front passenger seat belt fastened Below 1 Ω
        a5-10 (PBCL) - Body ground GR - Body ground Front passenger seat belt buckle switch signal Front passenger seat belt unfastened 10 kΩ or higher

      3. Reconnect the a4 and a5 position control ECU and switch assembly (front passenger seat) connectors.

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

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        a4-3 (SLD+) - a4-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        a4-4 (SLD-) - a4-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        a4-5 (FDWN) - a4-2 (GND) R - W-B Front vertical motor signal (downward) Front vertical switch off Below 1 V
        Front vertical switch on (Downward) 11 to 14 V
        a4-8 (FUP) - a4-2 (GND) B - W-B Front vertical motor signal (upward) Front vertical switch off Below 1 V
        Front vertical switch on (Upward) 11 to 14 V
        a4-9 (RCL+) - a4-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        a4-11 (RCL-) - a4-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        a4-10 (LFT+) - a4-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
        Lifter switch on (Upward) 11 to 14 V
        a4-12 (LFT-) - a4-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
        Lifter switch on (Downward) 11 to 14 V
        a5-1 (SGND) - a4-2 (GND) BR - W-B Position sensor ground Always Below 1 Ω
        a5-5 (SSRS) - a5-1 (SGND) G- BR Slide position signal Slide function operating 4.8 to 5.1 V

    2. for RHD

      A01F7V1N09

      1. Disconnect the b4 and b5 position control ECU and switch assembly (front passenger 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.

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        b4-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        b4-7 (+B) - b4-2 (GND) W - W-B Battery power supply Always 11 to 14 V
        b5-12 (SYSB) - b4-2 (GND) P - W-B System power source Always 11 to 14 V
        b5-3 (IG) - b4-2 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        b5-3 (IG) - b4-2 (GND) R - W-B Ignition power supply Engine switch off Below 1 V
        b5-10 (PBCL) - Body ground GR - Body ground Front passenger seat belt buckle switch signal Front passenger seat belt fastened Below 1 Ω
        b5-10 (PBCL) - Body ground GR - Body ground Front passenger seat belt buckle switch signal Front passenger seat belt unfastened 10 kΩ or higher

      3. Reconnect the b4 and b5 position control ECU and switch assembly (front passenger seat) connectors.

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

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        b4-3 (SLD+) - b4-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        b4-4 (SLD-) - b4-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        b4-5 (FDWN) - b4-2 (GND) R - W-B Front vertical motor signal (downward) Front vertical switch off Below 1 V
        Front vertical switch on (Downward) 11 to 14 V
        b4-8 (FUP) - b4-2 (GND) B - W-B Front vertical motor signal (upward) Front vertical switch off Below 1 V
        Front vertical switch on (Upward) 11 to 14 V
        b4-9 (RCL+) - b4-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        b4-11 (RCL-) - b4-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        b4-10 (LFT+) - b4-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
        Lifter switch on (Upward) 11 to 14 V
        b4-12 (LFT-) - b4-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
        Lifter switch on (Downward) 11 to 14 V
        b5-1 (SGND) - b4-2 (GND) BR - W-B Position sensor ground Always Below 1 Ω
        b5-5 (SSRS) - b5-1 (SGND) G- BR Slide position signal Slide function operating 4.8 to 5.1 V

  3. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) (w/ Memory)

    A01F7M8C12
    *A for LHD *B for RHD

    1. for LHD


      1. Disconnect the S12 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.

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        S12-6 (CPUB) - S12-7 (GND) L - W-B Battery power supply Always 11 to 14 V
        S12-14 (BDR) - S12-7 (GND) G - W-B Battery power supply Always 11 to 14 V
        S12-5 (SIG) - S12-7 (GND) B - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        S12-5 (SIG) - S12-7 (GND) B - W-B Ignition power supply Engine switch off Below 1 V
        S12-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      3. Reconnect the S12 outer mirror control ECU assembly (driver door) connector.

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

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        S12-1 (MM) - S12-7 (GND) L - W-B SET switch signal for seat memory switch (driver door) SET switch on Below 1 V
        SET switch off 11 to 14 V
        S12-2 (M1) - S12-7 (GND) BE - W-B M1 switch signal for seat memory switch (driver door) M1 switch on Below 1 V
        M1 switch off 11 to 14 V
        S12-3 (M2) - S12-7 (GND) LG - W-B M2 switch signal for seat memory switch (driver door) M2 switch on Below 1 V
        M2 switch off 11 to 14 V
        S12-4 (M3) - S12-7 (GND) R - W-B M3 switch signal for seat memory switch (driver door) M3 switch on Below 1 V
        M3 switch off 11 to 14 V

    2. for RHD


      1. Disconnect the R12 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.

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        R12-6 (CPUB) - R12-7 (GND) LG - W-B Battery power supply Always 11 to 14 V
        R12-14 (BDR) - R12-7 (GND) B - W-B Battery power supply Always 11 to 14 V
        R12-5 (SIG) - R12-7 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        R12-5 (SIG) - R12-7 (GND) R - W-B Ignition power supply Engine switch off Below 1 V
        R12-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      3. Reconnect the R12 outer mirror control ECU assembly (driver door) connector.

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

        Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
        R12-1 (MM) - R12-7 (GND) L - W-B SET switch signal for seat memory switch (driver door) SET switch on Below 1 V
        SET switch off 11 to 14 V
        R12-2 (M1) - R12-7 (GND) BE - W-B M1 switch signal for seat memory switch (driver door) M1 switch on Below 1 V
        M1 switch off 11 to 14 V
        R12-3 (M2) - R12-7 (GND) LG - W-B M2 switch signal for seat memory switch (driver door) M2 switch on Below 1 V
        M2 switch off 11 to 14 V
        R12-4 (M3) - R12-7 (GND) R - W-B M3 switch signal for seat memory switch (driver door) M3 switch on Below 1 V
        M3 switch off 11 to 14 V

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

    B0077UON27

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

      Click here

    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.

      Terminal No. (Symbol) 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
      O2-6 (FLCY) - Body ground*1 V - Body ground Front door courtesy light switch assembly (driver door) input Front door LH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      O2-27 (FRCY) - Body ground*2 V - Body ground Front door courtesy light switch assembly (driver door) input Front door RH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω

      • *1: for LHD

      • *2: for RHD