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


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


    1. for LHD

      A01VX58N20

      1. Disconnect the c5 and c6 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.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        c5-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        c5-7 (+B) - c5-2 (GND) W*1, R*2 - W-B Battery power supply Always 11 to 14 V
        c6-12 (SYSB) - c5-2 (GND) P - W-B System power source Always 11 to 14 V
        c6-3 (IG) - c5-2 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        c6-3 (IG) - c5-2 (GND) R - W-B Ignition power supply Engine switch off Below 1 V
        c6-10 (DBCL) - Body ground GR - Body ground Driver seat belt buckle switch signal Driver seat belt fastened Below 1 Ω
        c6-10 (DBCL) - Body ground GR - Body ground Driver seat belt buckle switch signal Driver seat belt unfastened 10 kΩ or higher

        • *1: w/o Seat Variable Cashion Switch

        • *2: w/ Seat Variable Cashion Switch

      3. Reconnect the c5 and c6 position control ECU and switch 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
        c5-6 (+B2) - c5-2 (GND) SB - W-B Lumbar support adjuster power source Always 11 to 14 V
        c5-1 (GND2) - Body ground W-B - Body ground Lumbar support adjuster ground Always Below 1 Ω
        c5-3 (SLD+) - c5-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        c5-4 (SLD-) - c5-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        c5-5 (FRV-) - c5-2 (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
        c5-8 (FRV+) - c5-2 (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
        c5-9 (RCL+) - c5-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        c5-11 (RCL-) - c5-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        c5-10 (LFT+) - c5-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
        Lifter switch on (Upward) 11 to 14 V
        c5-12 (LFT-) - c5-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
        Lifter switch on (Downward) 11 to 14 V
        c6-1 (SGND) - c5-2 (GND) BR - W-B Position sensor ground Always Below 1 Ω
        c6-5 (SSRS) - c6-1 (SGND) G - BR Slide position signal Slide function operating 4.8 to 5.1 V

    2. for RHD

      A01VWC4N14

      1. Disconnect the b16 and b17 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.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        b16-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        b16-7 (+B) - b16-2 (GND) W*1, R*2 - W-B Battery power supply Always 11 to 14 V
        b17-12 (SYSB) - b16-2 (GND) P - W-B System power source Always 11 to 14 V
        b17-3 (IG) - b16-2 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        b17-3 (IG) - b16-2 (GND) R - W-B Ignition power supply Engine switch off Below 1 V
        b17-10 (DBCL) - Body ground GR - Body ground Driver seat belt buckle switch signal Driver seat belt fastened Below 1 Ω
        b17-10 (DBCL) - Body ground GR - Body ground Driver seat belt buckle switch signal Driver seat belt unfastened 10 kΩ or higher

        • *1: w/o Seat Variable Cashion Switch

        • *2: w/ Seat Variable Cashion Switch

      3. Reconnect the b16 and b17 position control ECU and switch 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
        b16-6 (+B2) - b16-2 (GND) SB - W-B Lumbar support adjuster power source Always 11 to 14 V
        b16-1 (GND2) - Body ground W-B - Body ground Lumbar support adjuster ground Always Below 1 Ω
        b16-3 (SLD+) - b16-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        b16-4 (SLD-) - b16-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        b16-5 (FRV-) - b16-2 (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
        b16-8 (FRV+) - b16-2 (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
        b16-9 (RCL+) - b16-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        b16-11 (RCL-) - b16-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        b16-10 (LFT+) - b16-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
        Lifter switch on (Upward) 11 to 14 V
        b16-12 (LFT-) - b16-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
        Lifter switch on (Downward) 11 to 14 V
        b17-1 (SGND) - b16-2 (GND) BR - W-B Position sensor ground Always Below 1 Ω
        b17-5 (SSRS) - b17-1 (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

      A01VWC4N14

      1. Disconnect the b16 and b17 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.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        b16-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        b16-7 (+B) - b16-2 (GND) R - W-B Battery power supply Always 11 to 14 V
        b17-12 (SYSB) - b16-2 (GND) P - W-B System power source Always 11 to 14 V
        b17-3 (IG) - b16-2 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        b17-3 (IG) - b16-2 (GND) R - W-B Ignition power supply Engine switch off Below 1 V

      3. Reconnect the b16 and b17 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.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        b16-6 (+B2) - b16-2 (GND) SB - W-B Lumbar support adjuster power source Always 11 to 14 V
        b16-1 (GND2) - Body ground W-B - Body ground Lumbar support adjuster ground Always Below 1 Ω
        b16-3 (SLD+) - b16-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        b16-4 (SLD-) - b16-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        b16-5 (FRV-) - b16-2 (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
        b16-8 (FRV+) - b16-2 (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
        b16-9 (RCL+) - b16-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        b16-11 (RCL-) - b16-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        b16-10 (LFT+) - b16-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
        Lifter switch on (Upward) 11 to 14 V
        b16-12 (LFT-) - b16-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
        Lifter switch on (Downward) 11 to 14 V

    2. for RHD

      A01VX58N20

      1. Disconnect the c5 and c6 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.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        c5-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
        c5-7 (+B) - c5-2 (GND) R - W-B Battery power supply Always 11 to 14 V
        c6-12 (SYSB) - c5-2 (GND) P - W-B System power source Always 11 to 14 V
        c6-3 (IG) - c5-2 (GND) R - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        c6-3 (IG) - c5-2 (GND) R - W-B Ignition power supply Engine switch off Below 1 V

      3. Reconnect the c5 and c6 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.

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        c5-6 (+B2) - c5-2 (GND) SB - W-B Lumbar support adjuster power source Always 11 to 14 V
        c5-1 (GND2) - Body ground W-B - Body ground Lumbar support adjuster ground Always Below 1 Ω
        c5-3 (SLD+) - c5-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
        Slide switch on (Forward) 11 to 14 V
        c5-4 (SLD-) - c5-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
        Slide switch on (Rearward) 11 to 14 V
        c5-5 (FRV-) - c5-2 (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
        c5-8 (FRV+) - c5-2 (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
        c5-9 (RCL+) - c5-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
        Reclining switch on (Forward) 11 to 14 V
        c5-11 (RCL-) - c5-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
        Reclining switch on (Rearward) 11 to 14 V
        c5-10 (LFT+) - c5-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
        Lifter switch on (Upward) 11 to 14 V
        c5-12 (LFT-) - c5-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
        Lifter switch on (Downward) 11 to 14 V

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

    A01VTM0C20
    *A for LHD *B for RHD

    1. for LHD


      1. Disconnect the N4 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
        N4-6 (CPUB) - N4-7 (GND) L - W-B Battery power supply Always 11 to 14 V
        N4-14 (BDR) - N4-7 (GND) L - W-B Battery power supply Always 11 to 14 V
        N4-5 (SIG) - N4-7 (GND) Y - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        N4-5 (SIG) - N4-7 (GND) Y - W-B Ignition power supply Always Below 1 V
        N4-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      3. Reconnect the N4 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
        N4-1 (MM) - N4-7 (GND) W - W-B SET switch signal for seat memory switch (driver door) SET switch on Below 1 V
        SET switch off 11 to 14 V
        N4-2 (M1) - N4-7 (GND) G - W-B M1 switch signal for seat memory switch (driver door) M1 switch on Below 1 V
        M1 switch off 11 to 14 V
        N4-3 (M2) - N4-7 (GND) V - W-B M2 switch signal for seat memory switch (driver door) M2 switch on Below 1 V
        M2 switch off 11 to 14 V
        N4-4 (M3) - N4-7 (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 M4 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
        M4-6 (CPUB) - M4-7 (GND) GR - W-B Battery power supply Always 11 to 14 V
        M4-14 (BDR) - M4-7 (GND) G - W-B Battery power supply Always 11 to 14 V
        M4-5 (SIG) - M4-7 (GND) B - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        M4-5 (SIG) - M4-7 (GND) B - W-B Ignition power supply Always Below 1 V
        M4-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      3. Reconnect the M4 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
        M4-1 (MM) - M4-7 (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
        M4-2 (M1) - M4-7 (GND) GR - W-B M1 switch signal for seat memory switch (driver door) M1 switch on Below 1 V
        M1 switch off 11 to 14 V
        M4-3 (M2) - M4-7 (GND) V - W-B M2 switch signal for seat memory switch (driver door) M2 switch on Below 1 V
        M2 switch off 11 to 14 V
        M4-4 (M3) - M4-7 (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 OUTER MIRROR CONTROL ECU ASSEMBLY (FRONT PASSENGER DOOR)

    A01VTM0C21
    *A for LHD *B for RHD

    1. for LHD


      1. Disconnect the M4 outer mirror control ECU assembly (front passenger 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
        M4-6 (CPUB) - M4-7 (GND) GR - W-B Battery power supply Always 11 to 14 V
        M4-14 (BDR) - M4-7 (GND) G - W-B Battery power supply Always 11 to 14 V
        M4-5 (SIG) - M4-7 (GND) B - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        M4-5 (SIG) - M4-7 (GND) B - W-B Ignition power supply Always Below 1 V
        M4-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      3. Reconnect the M4 outer mirror control ECU assembly (front passenger door) connector.

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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        M4-1 (MM) - M4-7 (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
        M4-2 (M1) - M4-7 (GND) GR - W-B M1 switch signal for seat memory switch (driver door) M1 switch on Below 1 V
        M1 switch off 11 to 14 V
        M4-3 (M2) - M4-7 (GND) V - W-B M2 switch signal for seat memory switch (driver door) M2 switch on Below 1 V
        M2 switch off 11 to 14 V
        M4-4 (M3) - M4-7 (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 N4 outer mirror control ECU assembly (front passenger 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
        N4-6 (CPUB) - N4-7 (GND) L - W-B Battery power supply Always 11 to 14 V
        N4-14 (BDR) - N4-7 (GND) L - W-B Battery power supply Always 11 to 14 V
        N4-5 (SIG) - N4-7 (GND) Y - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
        N4-5 (SIG) - N4-7 (GND) Y - W-B Ignition power supply Always Below 1 V
        N4-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      3. Reconnect the N4 outer mirror control ECU assembly (front passenger door) connector.

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

        Tester Connection Wiring Color Terminal Description Condition Specified Condition
        N4-1 (MM) - N4-7 (GND) W - W-B SET switch signal for seat memory switch (driver door) SET switch on Below 1 V
        SET switch off 11 to 14 V
        N4-2 (M1) - N4-7 (GND) G - W-B M1 switch signal for seat memory switch (driver door) M1 switch on Below 1 V
        M1 switch off 11 to 14 V
        N4-3 (M2) - N4-7 (GND) V - W-B M2 switch signal for seat memory switch (driver door) M2 switch on Below 1 V
        M2 switch off 11 to 14 V
        N4-4 (M3) - N4-7 (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

  5. 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

      B005PPOC17
      *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
      J8-6 (FLCY) - Body ground*1 P - 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
      J8-27 (FRCY) - Body ground*2 R - 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

      If the result is not as specified, there may be a malfunction in the wire harness.