REAR POWER SEAT CONTROL SYSTEM Folding Motor Circuit

DTC Code DTC Name
Folding Motor Circuit

DESCRIPTION

The fold seat control ECU receives switch operation signals from the No. 1 and No. 2 fold seat switches and activates the power seat motors. At this time, the Hall IC detects the actuation of the seat cushion and sends a seat cushion actuation signal to the fold seat control ECU. The fold seat control ECU uses signals from the Hall IC to detect if an object is caught or if any other abnormal condition has occurred.

WIRING DIAGRAM

B246557E01

PROCEDURE

  1. INSPECT SEAT LEG ASSEMBLY

    1. B239766E02

      for LH Side:

      1. Remove the No. 3 seat leg assembly LH.

        Click here

      2. Check if the No. 3 seat leg moves smoothly when the battery is connected to the cushion motor connector terminals.

    2. for RH Side:

      1. Remove the No. 2 seat leg assembly.

        Click here

      2. Check if the No. 2 seat leg moves smoothly when the battery is connected to the cushion motor connector terminals.

        OK

        Measurement Condition

        Specified Condition

        Battery positive (+) → 3 (FWD)

        Battery negative (-) → 4 (BACK)

        Forward

        Battery positive (+) → 4 (BACK)

        Battery negative (-) → 3 (FWD)

        Backward

        Result

        Result

        Proceed to

        OK (for LH Side)

        A

        OK (for RH Side)

        B

        NG (for LH Side)

        C

        NG (for RH Side)

        D
    B

    CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - NO. 2 SEAT LEG)Click here

    C

    REPLACE NO. 3 SEAT LEG ASSEMBLY LH

    Click here

    D

    REPLACE NO. 2 SEAT LEG ASSEMBLY

    Click here

    A

  2. CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - NO. 3 SEAT LEG)

    1. Disconnect the d2 and d1 ECU connectors.

    2. Disconnect the d4 No. 3 seat leg connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      d1-17 (SV1) - d4-5 (HLV)

      Always

      Below 1 Ω

      d1-17 (SV1) - Body ground

      Always

      10 kΩ or higher

      d1-18 (SFLD) - d4-2 (HLS)

      Always

      Below 1 Ω

      d1-18 (SFLD) - Body ground

      Always

      10 kΩ or higher

      d1-25 (SG1) - d4-6 (HLG)

      Always

      Below 1 Ω

      d1-25 (SG1) - Body ground

      Always

      10 kΩ or higher

      d2-8 (FLD+) - d4-3 (FWD)

      Always

      Below 1 Ω

      d2-8 (FLD+) - Body ground

      Always

      10 kΩ or higher

      d2-7 (FLD-) - d4-4 (BACK)

      Always

      Below 1 Ω

      d2-7 (FLD-) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK FOLD SEAT CONTROL ECU LH

    B193667C01

    *a

    Component with harness connected (Fold Seat Control ECU LH)

    1. Remove the fold seat control ECU LH with its connectors still connected.

      Click here

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      d1-17 (SV1) - d1-25 (SG1)

      Engine switch off

      Below 1 V

      Engine switch on (IG)

      5.5 to 8 V

      d1-18 (SFLD) - d1-25 (SG1)

      Motor is operating

      Pulse generation

      d2-8 (FLD+) - Body ground

      No. 1 or No. 2 fold seat switch LH fold

      11 to 14 V

      d2-7 (FLD-) - Body ground

      No. 1 or No. 2 fold seat switch LH return

      11 to 14 V

    Result

    Result

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPLACE NO. 3 SEAT LEG ASSEMBLY LH

    Click here

  4. CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - NO. 2 SEAT LEG)

    1. Disconnect the c2 and c1 ECU connectors.

    2. Disconnect the c4 No. 2 seat leg connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      c1-17 (SV1) - c4-5 (HLV)

      Always

      Below 1 Ω

      c1-17 (SV1) - Body ground

      Always

      10 kΩ or higher

      c1-18 (SFLD) - c4-2 (HLS)

      Always

      Below 1 Ω

      c1-18 (SFLD) - Body ground

      Always

      10 kΩ or higher

      c1-25 (SG1) - c4-6 (HLG)

      Always

      Below 1 Ω

      c1-25 (SG1) - Body ground

      Always

      10 kΩ or higher

      c2-8 (FLD+) - c4-3 (FWD)

      Always

      Below 1 Ω

      c2-8 (FLD+) - Body ground

      Always

      10 kΩ or higher

      c2-7 (FLD-) - c4-4 (BACK)

      Always

      Below 1 Ω

      c2-7 (FLD-) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK FOLD SEAT CONTROL ECU RH

    B193667C02

    *a

    Component with harness connected (Fold Seat Control ECU RH)

    1. Remove the fold seat control ECU RH with its connectors still connected.

      Click here

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      c1-17 (SV1) - c1-25 (SG1)

      Engine switch off

      Below 1 V

      Engine switch on (IG)

      5.5 to 8 V

      c1-18 (SFLD) - c1-25 (SG1)

      Motor is operating

      Pulse generation

      c2-8 (FLD+) - Body ground

      No. 1 or No. 2 fold seat switch RH fold

      11 to 14 V

      c2-7 (FLD-) - Body ground

      No. 1 or No. 2 fold seat switch RH return

      11 to 14 V

    Result

    Result

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPLACE NO. 2 SEAT LEG ASSEMBLY

    Click here