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Home >> Lexus >> 2013 >> GS 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Front Power Seat Control System (Diagnostic Codes & Circuit Tests) >> Front Power Seat Control System >> DTC B2659: Side Support Sensor Circuit >> Procedure

DTC B2659: Side Support Sensor Circuit: Procedure

  1. CHECK FOR DTC 
    1. Check the parts which the DTCs have been output from. Refer to DTC CHECK / CLEAR [12/2011 - ] .
      RESULT

      Result Proceed to
      DTC output from "Driver Seat" A
      DTC output from "Passenger Seat" B

    B → See step   8 

    A: Go to next step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM (SIDE SUPPORT OPERATION) 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Body Electrical / Driver Seat / Active Test.
    6. Perform the Active Test according to the display on the Techstream.
      DRIVER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Side Support Operation Side support operation Open / OFF / Close -

      OK

      Motor operates normally.

    NG → See step   6 

    OK: Go to next step 

  3. CHECK POSITION CONTROL ECU ASSEMBLY (SIDE SUPPORT MOTOR CIRCUIT) 
    1. Disconnect the side support motor connector.
      GTY400469Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      d30-2 (SISR) - d30-3 (ISRE) Side support switch on 4.8 to 5.1 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Front Seat Back Support LH [Side Support Motor])

    NG → See step   5 

    OK: Go to next step 

  4. CHECK FRONT SEAT BACK SUPPORT LH (SIDE SUPPORT MOTOR) 
    1. Reconnect the side support motor connector.
      GTY414020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      d30-2 (SISR) - Body ground Side support switch on 4.5 to 4.8 V
      RESULT

      Result Proceed to
      OK (for Sports Seat Type) A
      OK (for Luxury Seat Type) B
      NG (for Sports Seat Type) C
      NG (for Luxury Seat Type) D
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Front Seat Back Support LH [Side Support Motor])

    B → See step   15 

    C → See step   16 

    D → See step   17 

    A → See step   14 

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT BACK SUPPORT LH) 
    1. Disconnect the d4 and d5 position control ECU assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      d4-16 (SSIR) - d30-2 (SISR) Always Below 1 Ω
      d5-20 (SGND) - d30-3 (ISRE) Always Below 1 Ω
      d4-16 (SSIR) - Body ground Always 10 kΩ or higher
      d5-20 (SGND) - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      OK (for Sports Seat Type) A
      OK (for Luxury Seat Type) B
      NG C

    B → See step   15 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   14 

  6. INSPECT FRONT SEAT BACK SUPPORT LH (SIDE SUPPORT MOTOR) 
    1. Disconnect the d30 side support motor connector.
      GTY411181Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check if the side support motor moves smoothly when the battery is connected to the side support motor connector terminals.

      OK

      Measurement Condition Operational Direction
      Battery positive (+) → 4 (ISR+)
      Battery negative (-) → 1 (ISR-)      		 Paddle Open
      Battery positive (+) → 1 (ISR-)
      Battery negative (-) → 4 (ISR+)      		 Paddle Close
      RESULT

      Result Proceed to
      OK A
      NG (for Sports Seat Type) B
      NG (for Luxury Seat Type) C
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Front Seat Back Support LH [Side Support Motor])

    B → See step   16 

    C → See step   17 

    A: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT BACK SUPPORT LH) 
    1. Disconnect the d3 position control ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      d3-3 (ISR+) - d30-4 (ISR+) Always Below 1 Ω
      d3-6 (ISR-) - d30-1 (ISR-) Always Below 1 Ω
      d3-3 (ISR+) - Body ground Always 10 kΩ or higher
      d3-6 (ISR-) - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      OK (for Sports Seat Type) A
      OK (for Luxury Seat Type) B
      NG C

    B → See step   15 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   14 

  8. PERFORM ACTIVE TEST USING TECHSTREAM (SIDE SUPPORT OPERATION) 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Body Electrical / Passenger Seat / Active Test.
    6. Perform the Active Test according to the display on the Techstream.
      PASSENGER SEAT

      Tester Display Test Part Control Range Diagnostic Note
      Side Support Operation Side support operation Open / OFF / Close -

      OK

      Motor operates normally.

    NG → See step   12 

    OK: Go to next step 

  9. CHECK POSITION CONTROL ECU ASSEMBLY (SIDE SUPPORT MOTOR CIRCUIT) 
    1. Disconnect the side support motor connector.
      GTY400470Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      c28-2 (SISR) - c28-3 (ISRG) Side support switch on 4.8 to 5.1 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Front Seat Back Support RH [Side Support Motor])

    NG → See step   11 

    OK: Go to next step 

  10. CHECK FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR) 
    1. Reconnect the side support motor connector.
      GTY414021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      c28-2 (SISR) - Body ground Side support switch on 4.5 to 4.8 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Front Seat Back Support RH [Side Support Motor])

    NG → See step   18 

    OK → See step   15 

  11. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT BACK SUPPORT RH) 
    1. Disconnect the c2 and c3 position control ECU assembly connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      c3-16 (SSIR) - c28-2 (SISR) Always Below 1 Ω
      c2-20 (SGND) - c28-3 (ISRG) Always Below 1 Ω
      c3-16 (SSIR) - Body ground Always 10 kΩ or higher
      c2-20 (SGND) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   15 

  12. INSPECT FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR) 
    1. Disconnect the c28 side support motor connector.
      GTY419291Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check if the side support motor moves smoothly when the battery is connected to the side support motor connector terminals.

      OK

      Measurement Condition Operational Direction
      Battery positive (+) → 4 (ISR+)
      Battery negative (-) → 1 (ISR-)      		 Paddle Open
      Battery positive (+) → 1 (ISR+)
      Battery negative (-) → 4 (ISR-)      		 Paddle Close
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Front Seat Back Support RH [Side Support Motor])

    NG → See step   18 

    OK: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT BACK SUPPORT RH) 
    1. Disconnect the c4 position control ECU assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      c4-3 (ISR+) - c28-4 (ISR+) Always Below 1 Ω
      c4-6 (ISR-) - c28-1 (ISR-) Always Below 1 Ω
      c4-3 (ISR+) - Body ground Always 10 kΩ or higher
      c4-6 (ISR-) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   15 

  14. REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2011 - ] 
  15. REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2011 - ] 
  16. REPLACE FRONT SEAT BACK SUPPORT LH (SIDE SUPPORT MOTOR). Refer to  DISASSEMBLY [12/2011 - ] 
  17. REPLACE FRONT SEAT BACK SUPPORT LH (SIDE SUPPORT MOTOR). Refer to  DISASSEMBLY [12/2011 - ] 
  18. REPLACE FRONT SEAT BACK SUPPORT RH (SIDE SUPPORT MOTOR). Refer to  DISASSEMBLY [12/2011 - ] 
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