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


  1. CHECK FRONT POWER SEAT SWITCH (for LHD)

    B001CC0E04

    1. Disconnect the b4 and b5 connectors from the front power seat switch LH.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      b4-1 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      b4-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      b4-6 (+B2) - b4-1 (GND2) SB - W-B Power source Always 11 to 14 V
      b4-7 (+B) - b4-2 (GND) W - W-B Power source Always 11 to 14 V
      b5-12 (SYSB) - b4-2 (GND) P - W-B System power source Always 11 to 14 V

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

    3. Reconnect the b4 and b5 switch connectors.

    4. Measure the voltage 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 Sliding 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 Sliding 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 Ground Always Below 1 Ω
      b5-3 (SSFV) - b5-1 (SGND) R - BR Front vertical position signal Front vertical function operating 4.5 to 4.8 V
      b5-4 (SSRL) - b5-1 (SGND) P - BR Lifter position signal Lifter function operating 4.5 to 4.8 V
      b5-5 (SSRS) - b5-1 (SGND) G- BR Slide position signal Slide function operating 4.5 to 4.8 V
      b5-11 (SSRR) - b5-1 (SGND) V - BR Reclining position signal Reclining function operating 4.5 to 4.8 V

      If the result is not as specified, the front power seat switch may have a malfunction.

  2. CHECK FRONT POWER SEAT SWITCH (for RHD)

    B001D0XE02

    1. Disconnect the a4 and a5 connectors from the front power seat switch RH.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      a4-1 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      a4-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      a4-6 (+B2) - a4-1 (GND2) SB - W-B Power source Always 11 to 14 V
      a4-7 (+B) - a4-2 (GND) W - W-B Power source Always 11 to 14 V
      a5-12 (SYSB) - a4-2 (GND) P - W-B System power source Always 11 to 14 V

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

    3. Reconnect the a4 and a5 switch connectors.

    4. Measure the voltage 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 Sliding 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 Sliding 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 Ground Always Below 1 Ω
      a5-3 (SSFV) - a5-1 (SGND) R - BR Front vertical position signal Front vertical function operating 4.5 to 4.8 V
      a5-4 (SSRL) - a5-1 (SGND) P - BR Lifter position signal Lifter function operating 4.5 to 4.8 V
      a5-5 (SSRS) - a5-1 (SGND) G - BR Slide position signal Slide function operating 4.5 to 4.8 V
      a5-11 (SSRR) - a5-1 (SGND) V - BR Reclining position signal Reclining function operating 4.5 to 4.8 V

      If the result is not as specified, the front power seat switch may have a malfunction.

  3. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    B001CIBC01
    *A Main Body ECU (Multiplex Network Body ECU) with 3 connectors *B for LHD
    *C for RHD - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -

    1. Remove the main body ECU Click here.

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

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-32 (IG) - Body ground None - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      A-31 (BECU) - Body ground None - Body ground Battery power supply Always 11 to 14 V
      A-30 (ACC) - Body ground None - Body ground ACC power supply Ignition switch ACC 11 to 14 V
      Ignition switch off Below 1 V
      A-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω

    3. Install the main body ECU Click here.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G217-13 (M1) - Body ground SB - Body ground Memory switch M1 signal Memory switch M1 off Pulse generation
      Memory switch M1 on Below 1 V
      G217-16 (MM) - Body ground LG - Body ground Memory switch SET signal Memory switch SET off Pulse generation
      Memory switch SET on Below 1 V
      G217-14 (M2) - Body ground V - Body ground Memory switch M2 signal Memory switch M2 off Pulse generation
      Memory switch M2 on Below 1 V
      G218-6 (FLCY) - Body ground*1 R - Body ground Front door courtesy light switch LH signal Front door LH closed Pulse generation
      Front door LH open Below 1 V
      G218-27 (FRCY) - Body ground*2 B - Body ground Front door courtesy light switch RH signal Front door RH closed Pulse generation
      Front door RH open Below 1 V

      • *1: for LHD

      • *2: for RHD