FRONT POWER SEAT CONTROL SYSTEM (for Driver Side) TERMINALS OF ECU


  1. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (for LHD)

    A01CC77E27

    1. Disconnect the W17 and W16 connectors from the position control ECU and switch assembly.

    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
      W16-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      W16-6 (+B) - W16-1 (GND) P - W-B Power source Always 11 to 14 V
      W17-12 (SYSB) - Body ground LG - Body ground System power source Always 11 to 14 V
      W17-4 (DBCL) - Body ground P - Body ground Driver seat belt buckle switch signal Driver seat belt fastened → unfastened Below 1 Ω → 10 kΩ or higher

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

    3. Reconnect the W17 and W16 position control ECU and switch assembly connectors.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      W16-2 (SLD+) - W16-1 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
      Slide switch on (Forward) 11 to 14 V
      W16-4 (SLD-) - W16-1 (GND) Y - W-B Slide motor signal (rearward) Slide switch off Below 1 V
      Slide switch on (Rearward) 11 to 14 V
      W16-7 (FRV+) - W16-1 (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
      W16-5 (FRV-) - W16-1 (GND) G - W-B Front vertical motor signal (downward) Front vertical switch off Below 1 V
      Front vertical switch on (Downward) 11 to 14 V
      W16-8 (LFT+) - W16-1 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
      Lifter switch on (Upward) 11 to 14 V
      W16-11 (LFT-) - W16-1 (GND) W - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
      Lifter switch on (Downward) 11 to 14 V
      W16-9 (RCL+) - W16-1 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
      Reclining switch on (Forward) 11 to 14 V
      W16-12 (RCL-) - W16-1 (GND) BR - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
      Reclining switch on (Rearward) 11 to 14 V

      If the result is not as specified, the position control ECU and switch assembly may have a malfunction.

  2. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (for RHD)

    A01CFUEE10

    1. Disconnect the V16 and V15 connectors from the position control ECU and switch assembly.

    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
      V15-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      V15-6 (+B) - V15-1 (GND) P - W-B Power source Always 11 to 14 V
      V16-12 (SYSB) - V15-1 (GND) LG - W-B System power source Always 11 to 14 V
      V16-4 (DBCL) - Body ground P - Body ground Driver seat belt buckle switch signal Driver seat belt fastened → unfastened Below 1 Ω → 10 kΩ or higher

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

    3. Reconnect the V16 and V15 position control ECU and switch assembly connectors.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      V15-2 (SLD+) - V15-1 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
      Slide switch on (Forward) 11 to 14 V
      V15-4 (SLD-) - V15-1 (GND) Y - W-B Slide motor signal (rearward) Slide switch off Below 1 V
      Slide switch on (Rearward) 11 to 14 V
      V15-7 (FRV+) - V15-1 (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
      V15-5 (FRV-) - V15-1 (GND) G - W-B Front vertical motor signal (downward) Front vertical switch off Below 1 V
      Front vertical switch on (Downward) 11 to 14 V
      V15-8 (LFT+) - V15-1 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
      Lifter switch on (Upward) 11 to 14 V
      V15-11 (LFT-) - V15-1 (GND) W - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
      Lifter switch on (Downward) 11 to 14 V
      V15-9 (RCL+) - V15-1 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
      Reclining switch on (Forward) 11 to 14 V
      V15-12 (RCL-) - V15-1 (GND) BR - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
      Reclining switch on (Rearward) 11 to 14 V

      If the result is not as specified, the position control ECU and switch assembly may have a malfunction.

  3. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (for LHD)

    A01CAVBE19

    1. Disconnect the J13 connector from the outer mirror control ECU assembly.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J13 -9 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      J13-3 (B) - J13-9 (GND) Y - W-B Battery (ECU power source) Always 11 to 14 V
      J13-4 (ACC) - J13-9 (GND) P - W-B ACC power supply Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V

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

    3. Reconnect the J13 connector to the outer mirror control ECU assembly.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      J12-6 (M3) - J12-10 (MSWE) V - W M3 switch signal for seat memory switch M3 switch on 11 to 14 V
      M3 switch off Below 1 V
      J12-7 (M2) - J12-10 (MSWE) LG - W M2 switch signal for seat memory switch M2 switch on 11 to 14 V
      M2 switch off Below 1 V
      J12-8 (M1) - J12-10 (MSWE) B - W M1 switch signal for seat memory switch M1 switch on 11 to 14 V
      M1 switch off Below 1 V
      J12-9 (MM) - J12-10 (MSWE) BR - W SET switch signal for seat memory switch SET switch on 11 to 14 V
      SET switch off Below 1 V

      If the result is not as specified, the outer mirror control ECU assembly may have a malfunction.

  4. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (for RHD)

    A01CAVBE14

    1. Disconnect the I10 connector from the outer mirror control ECU assembly.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I10 -9 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      I10-3 (B) - I10-9 (GND) Y - W-B Battery (ECU power source) Always 11 to 14 V
      I10-4 (ACC) - I10-9 (GND) P - W-B ACC power supply Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V

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

    3. Reconnect the I10 connector to the outer mirror control ECU assembly.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I9-6 (M3) - I9-10 (MSWE) V - W M3 switch signal for seat memory switch M3 switch on 11 to 14 V
      M3 switch off Below 1 V
      I9-7 (M2) - I9-10 (MSWE) LG - W M2 switch signal for seat memory switch M2 switch on 11 to 14 V
      M2 switch off Below 1 V
      I9-8 (M1) - I9-10 (MSWE) B - W M1 switch signal for seat memory switch M1 switch on 11 to 14 V
      M1 switch off Below 1 V
      I9-9 (MM) - I9-10 (MSWE) BR - W SET switch signal for seat memory switch SET switch on 11 to 14 V
      SET switch off Below 1 V

      If the result is not as specified, the outer mirror control ECU assembly may have a malfunction.

  5. CHECK MAIN BODY ECU

    A01CB3DE14

    1. Disconnect the 4K, 4A and 4M connectors from the main body ECU.

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      4K-9 (BATB) - Body ground W - Body ground BATB power supply Always 11 to 14 V
      4A-26 (ACC) - Body ground GR - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V
      4M-1 (IG) - Body ground W - Body ground IG power supply Engine switch on (IG) 11 to 14 V
      4A-3 (GND2) - Body ground W-B - Body ground Body ground Always Below 1 Ω

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