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


  1. CHECK FRONT POWER SEAT SWITCH LH (W/ MEMORY)


    1. Disconnect the e11 and e12 front power seat switch LH (w/ Memory) 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.

      Terminal Connection Wiring Color Terminal Description Condition Specified Condition
      e11-2 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      e11-7 (+B) - e11-2 (GND) W - W-B Power source Always 11 to 14 V
      e12-12 (SYSB) - e11-2 (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 e11 and e12 front power seat switch LH (w/ Memory) connectors.

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

      Terminal Connection Wiring Color Terminal Description Condition Specified Condition
      e11-6 (+B2) - e11-1 (GND2) SB - W-B Lumbar support adjuster power source Always 11 to 14 V
      e11-1 (GND2) - Body ground W-B - Body ground Lumbar support adjuster ground Always Below 1 Ω
      e11-3 (SLD+) - e11-2 (GND) L - W-B Slide motor signal (forward) Slide switch off Below 1 V
      Slide switch on (Forward) 11 to 14 V
      e11-4 (SLD-) - e11-2 (GND) GR - W-B Slide motor signal (rearward) Slide switch off Below 1 V
      Slide switch on (Rearward) 11 to 14 V
      e11-5 (FRV-) - e11-2 (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
      e11-8 (FRV+) - e11-2 (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
      e11-9 (RCL+) - e11-2 (GND) P - W-B Reclining motor signal (forward) Reclining switch off Below 1 V
      Reclining switch on (Forward) 11 to 14 V
      e11-11 (RCL-) - e11-2 (GND) LG - W-B Reclining motor signal (rearward) Reclining switch off Below 1 V
      Reclining switch on (Rearward) 11 to 14 V
      e11-10 (LFT+) - e11-2 (GND) V - W-B Lifter motor signal (upward) Lifter switch off Below 1 V
      Lifter switch on (Upward) 11 to 14 V
      e11-12 (LFT-) - e11-2 (GND) G - W-B Lifter motor signal (downward) Lifter switch off Below 1 V
      Lifter switch on (Downward) 11 to 14 V
      e12-1 (SGND) - e11-2 (GND) BR - W-B Position sensor round Always Below 1 Ω
      e12-3 (SSFV) - e12-1 (SGND) R - BR Front vertical position signal Front vertical function operating 4.5 to 4.8 V
      e12-4 (SSRL) - e12-1 (SGND) P - BR Lifter position signal Lifter function operating 4.5 to 4.8 V
      e12-5 (SSRS) - e12-1 (SGND) G- BR Slide position signal Slide function operating 4.5 to 4.8 V
      e12-11 (SSRR) - e12-1 (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 LH (w/ Memory) may have a malfunction.

  2. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY LH


    1. Disconnect the K12 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
      K12-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K12-14 (BDR) - K12-7 (GND) GR - W-B Power source Always 11 to 14 V
      K12-5 (SIG) - K12-7 (GND) GR - W-B Power source (IG) Always Below 1 V
      Engine switch on (IG) 11 to 14 V
      K12-6 (CPUB) - K12-7 (GND) W - 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 K12 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
      K12-3 (M2) - K12-4 (MSWE) G - B M2 switch signal for seat memory switch M2 switch on Below 1 V
      M2 switch off 11 to 14 V
      K12-2 (M1) - K12-4 (MSWE) R - B M1 switch signal for seat memory switch M1 switch on Below 1 V
      M1 switch off 11 to 14 V
      K12-1 (MM) - K12-4 (MSWE) P - B 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 have a malfunction.

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


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      Text in Illustration
      *A Main body ECU (multiplex network body ECU) with 3 connectors - -
      *1 Main body ECU (multiplex network body ECU) *2 3 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
      MB-30 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      MB-31 (ALTB) - Body ground - Battery power supply Always 11 to 14 V
      MB-32 (IG) - Body ground - Ignition power supply (IG signal) Engine switch on (IG) → off 11 to 14 V → Below 1 V
      MB-29 (ACC) - Body ground - Ignition power supply (ACC signal) Engine switch on (ACC) → off 11 to 14 V → Below 1 V
      MB-11 (GND1) - Body ground - Ground Always Below 1 Ω
      I12-3 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      MB-2 (FLCY) - Body ground - Front door courtesy light switch LH input Front door LH closed (OFF) → open (ON) 10 kΩ or higher → Below 1 Ω

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