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


  1. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY


    1. Disconnect the T10 and T11 position control ECU and switch assembly connectors.

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    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
      T10-1 (GND) - Body ground W - Body ground Ground Always Below 1 Ω
      T11-4 (DBCL) - T10-1 (GND) L - W Driver seat belt buckle switch signal Driver seat belt fastened Below 1 Ω
      T11-4 (DBCL) - T10-1 (GND) L - W Driver seat belt buckle switch signal Driver seat belt unfastened 10 kΩ or higher
      T10-6 (+B) - T10-1 (GND) L - W Power source Always 11 to 14 V
      T11-12 (SYSB) - T10-1 (GND) W - W 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 T10 and T11 position control ECU and switch assembly connectors.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      T10-2 (SLD+) - T10-1 (GND) Y - W Sliding motor signal (forward) Slide switch off Below 1 V
      Slide switch on (Forward) 11 to 14 V
      T10-4 (SLD-) - T10-1 (GND) G - W Sliding motor signal (rearward) Slide switch off Below 1 V
      Slide switch on (Rearward) 11 to 14 V
      T10-7 (FRV+) - T10-1 (GND) GR - W Front vertical motor signal (upward) Front vertical switch off Below 1 V
      Front vertical switch on (Upward) 11 to 14 V
      T10-5 (FRV-) - T10-1 (GND) LG - W Front vertical motor signal (downward) Front vertical switch off Below 1 V
      Front vertical switch on (Downward) 11 to 14 V
      T10-8 (LFT+) - T10-1 (GND) SB - W Lifter motor signal (upward) Lifter switch off Below 1 V
      Lifter switch on (Upward) 11 to 14 V
      T10-11 (LFT-) - T10-1 (GND) P - W Lifter motor signal (downward) Lifter switch off Below 1 V
      Lifter switch on (Downward) 11 to 14 V
      T10-9 (RCL+) - T10-1 (GND) L - W Reclining motor signal (forward) Reclining switch off Below 1 V
      Reclining switch on (Forward) 11 to 14 V
      T10-12 (RCL-) - T10-1 (GND) R - W 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 be malfunctioning.

  2. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY LH


    1. Disconnect the I13 outer mirror control ECU assembly LH connector.

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    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
      I13-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      I13-14 (BDR) - I13-7 (GND) V - W-B Power source Always 11 to 14 V
      I13-5 (SIG) - I13-7 (GND) L - W-B Power source (IG) Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      I13-6 (CPUB) - I13-7 (GND) LG - W-B Power source Always 11 to 14 V

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

    3. Reconnect the I13 outer mirror control ECU assembly LH connector.

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      I13-3 (M2) - I13-13 (MSWE) V - Y M2 switch signal for seat memory switch M2 switch on Below 1 V
      M2 switch off 11 to 14 V
      I13-2 (M1) - I13-13 (MSWE) B - Y M1 switch signal for seat memory switch M1 switch on Below 1 V
      M1 switch off 11 to 14 V
      I13-1 (MM) - I13-13 (MSWE) GR - Y SET switch signal for seat memory switch SET switch on Below 1 V
      SET switch off 11 to 14 V

      If the result is not as specified, the outer mirror control ECU assembly LH may be malfunctioning.

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


    1. Disconnect the main body ECU (driver side junction block assembly) connectors.

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

      Tech Tips

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

      Tester Connection Wiring Color Terminal Description Condition Specified Condition
      D50-24 (DCTY) - Body ground V - Body ground Driver side door courtesy light switch input Driver side door closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω
      2A-1 (ACC) - Body ground B - Body ground Ignition power supply (ACC signal) Ignition switch ACC → OFF 11 to 14 V → Below 1 V
      2A-1 (IG) - Body ground B - Body ground Ignition power supply (IG signal) Ignition switch ON → OFF 11 to 14 V → Below 1 V
      2C-30 (ALTB) - Body ground BR - Body ground +B (power system alternator system) power supply Always 11 to 14 V
      2F-16 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      2C-24 (BECU) - Body ground L - Body ground +B power supply Always 11 to 14 V

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