FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2652

DESCRIPTION

When the front power seat switch (seat ECU) does not receive a sensor signal despite upward or downward movement of seat by power seat motor operation, this DTC is output.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK FOR DTC

   
   

   1. DTC output area check

      
      

      1. Using the intelligent tester, determine the area that output the DTC.

         Table 1. Result

         Result	Proceed to
         B2652 output from driver seat ECU	A
         B2652 output from passenger seat ECU	B

   
   
   • AClick here
   • BClick here
2. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER (POWER SEAT MOTOR FUNCTION)

   
   

   1. Select the Active Test, use the intelligent tester to generate a control command, and then check the power seat motor function.

      Table 2. Driver Seat

      Tester Display	Test Part	Control Range	Diagnostic Note
      Front Vertical Operation	Seat front vertical operation	Up / OFF / Down	-

      OK
      Motor operates normally.

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR)

   
   

   1. for LHD:

      
      

      1. Disconnect the e46 switch connector.

      2. Disconnect the e101 motor connector.

   2. for RHD:

      
      

      1. Disconnect the e79 switch connector.

      2. Disconnect the e96 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition e46-8 (PVCC) - e101-5 (VCC) Always Below 1 Ω e46-19 (SSFV) - e101-2 (O/P) Always Below 1 Ω e46-18 (SGND) - e101-6 (GND) Always Below 1 Ω e46-8 (PVCC) - Body ground Always 10 kΩ or higher e46-19 (SSFV) - Body ground Always 10 kΩ or higher e46-18 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition e79-8 (PVCC) - e96-5 (VCC) Always Below 1 Ω e79-19 (SSFV) - e96-2 (O/P) Always Below 1 Ω e79-18 (SGND) - e96-6 (GND) Always Below 1 Ω e79-8 (PVCC) - Body ground Always 10 kΩ or higher e79-19 (SSFV) - Body ground Always 10 kΩ or higher e79-18 (SGND) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

   
   

   1. for LHD:

      Disconnect the e101 motor connector.

   2. for RHD:

      Disconnect the e96 motor connector.

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition e101-5 (VCC) - e101-6 (GND) Front vertical switch ON 7.2 to 8.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition e96-5 (VCC) - e96-6 (GND) Front vertical switch ON 7.2 to 8.8 V

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

   
   

   1. for LHD:

      Reconnect the e101 motor connector.

   2. for RHD:

      Reconnect the e96 motor connector.

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition e101-2 (O/P) - Body ground Front vertical switch ON 0 to 8 V
      for RHD
      Tester Connection Switch Condition Specified Condition e96-2 (O/P) - Body ground Front vertical switch ON 0 to 8 V

   
   
   • OKClick here
   • NGClick here
6. Click here

   CHECK FOR DTC

   
   

   1. Clear the DTC (see pageClick here).

   2. Recheck for DTC.

      OK
      DTC B2652 is not output.

   
   
   • OKClick here
   • NGClick here
7. Click here

   INSPECT FRONT SEAT ADJUSTER ASSEMBLY (POWER SEAT MOTOR)

   
   
   1. 

      Check operation of the power seat motor (front vertical motor).

      
      

      1. Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals.

         OK
         Table 3. for LHD Measurement Condition Operational Direction Battery positive (+) → 3 Battery negative (-) → 4 Upward Battery positive (+) → 4 Battery negative (-) → 3 Downward
         Table 4. for RHD Measurement Condition Operational Direction Battery positive (+) → 4 Battery negative (-) → 3 Upward Battery positive (+) → 3 Battery negative (-) → 4 Downward

   
   
   • OKClick here
   • NGClick here
8. Click here

   CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR)

   
   

   1. for LHD:

      
      

      1. Disconnect the e45 and e46 switch connectors.

      2. Disconnect the e101 motor connector.

   2. for RHD:

      
      

      1. Disconnect the e78 and e79 switch connectors.

      2. Disconnect the e96 motor connector.

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

      Standard resistance
      for LHD
      Tester Connection Condition Specified Condition e46-1 (FRV+) - e101-3 (UP) Always Below 1 Ω e45-12 (FRV-) - e101-4 (DOWN) Always Below 1 Ω e46-1 (FRV+) - Body ground Always 10 kΩ or higher e45-12 (FRV-) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition e79-1 (FRV+) - e96-4 (UP) Always Below 1 Ω e78-12 (FRV-) - e96-3 (DOWN) Always Below 1 Ω e79-1 (FRV+) - Body ground Always 10 kΩ or higher e78-12 (FRV-) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
9. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER (POWER SEAT MOTOR FUNCTION)

   
   

   1. Select the Active Test, use the intelligent tester to generate a control command, and then check the power seat motor function.

      Table 5. Passenger Seat

      Tester Display	Test Part	Control Range	Diagnostic Note
      Front Vertical Operation	Seat front vertical operation	Up / OFF / Down	-

      OK
      Motor operates normally.

   
   
   • OKClick here
   • NGClick here
10. Click here

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR)

    
    

    1. for LHD:

       
       

       1. Disconnect the e20 switch connector.

       2. Disconnect the e96 motor connector.

    2. for RHD:

       
       

       1. Disconnect the e72 switch connector.

       2. Disconnect the e101 motor connector.

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

       Standard resistance
       for LHD
       Tester Connection Condition Specified Condition e20-8 (PVCC) - e96-5 (VCC) Always Below 1 Ω e20-19 (SSFV) - e96-2 (O/P) Always Below 1 Ω e20-18 (SGND) - e96-6 (GND) Always Below 1 Ω e20-8 (PVCC) - Body ground Always 10 kΩ or higher e20-19 (SSFV) - Body ground Always 10 kΩ or higher e20-18 (SGND) - Body ground Always 10 kΩ or higher
       for RHD
       Tester Connection Condition Specified Condition e72-8 (PVCC) - e101-5 (VCC) Always Below 1 Ω e72-19 (SSFV) - e101-2 (O/P) Always Below 1 Ω e72-18 (SGND) - e101-6 (GND) Always Below 1 Ω e72-8 (PVCC) - Body ground Always 10 kΩ or higher e72-19 (SSFV) - Body ground Always 10 kΩ or higher e72-18 (SGND) - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
11. Click here

    CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

    
    

    1. for LHD:

       Disconnect the e96 motor connector.

    2. for RHD:

       Disconnect the e101 motor connector.

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

       Standard voltage
       for LHD
       Tester Connection Switch Condition Specified Condition e96-5 (VCC) - e96-6 (GND) Front vertical switch ON 7.2 to 8.8 V
       for RHD
       Tester Connection Switch Condition Specified Condition e101-5 (VCC) - e101-6 (GND) Front vertical switch ON 7.2 to 8.8 V

    
    
    • OKClick here
    • NGClick here
12. Click here

    CHECK FRONT SEAT ADJUSTER ASSEMBLY (POSITION CONTROL SENSOR)

    
    

    1. for LHD:

       Reconnect the e96 motor connector.

    2. for RHD:

       Reconnect the e101 motor connector.

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

       Standard voltage
       for LHD
       Tester Connection Switch Condition Specified Condition e96-2 (O/P) - Body ground Front vertical switch ON 0 to 8 V
       for RHD
       Tester Connection Switch Condition Specified Condition e101-2 (O/P) - Body ground Front vertical switch ON 0 to 8 V

    
    
    • OKClick here
    • NGClick here
13. Click here

    CHECK FOR DTC

    
    

    1. Clear the DTC (see pageClick here).

    2. Recheck for DTC.

       OK
       DTC B2652 is not output.

    
    
    • OKClick here
    • NGClick here
14. Click here

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY (POWER SEAT MOTOR)

    
    
    1. 

       Check operation of the power seat motor (front vertical motor).

       
       

       1. Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals.

          OK
          for LHD
          Measurement Condition Operational Direction Battery positive (+) → 4 Battery negative (-) → 3 Upward Battery positive (+) → 3 Battery negative (-) → 4 Downward
          for RHD
          Measurement Condition Operational Direction Battery positive (+) → 3 Battery negative (-) → 4 Upward Battery positive (+) → 4 Battery negative (-) → 3 Downward

    
    
    • OKClick here
    • NGClick here
15. Click here

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR)

    
    

    1. for LHD:

       
       

       1. Disconnect the e18 and e20 switch connectors.

       2. Disconnect the e96 motor connector.

    2. for RHD:

       
       

       1. Disconnect the e71 and e72 switch connectors.

       2. Disconnect the e101 motor connector.

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

       Standard resistance
       for LHD
       Tester Connection Condition Specified Condition e20-1 (FUP) - e96-4 (UP) Always Below 1 Ω e18-12 (FDWN) - e96-3 (DOWN) Always Below 1 Ω e20-1 (FUP) - Body ground Always 10 kΩ or higher e18-12 (FDWN) - Body ground Always 10 kΩ or higher
       for RHD
       Tester Connection Condition Specified Condition e72-1 (FUP) - e101-3 (UP) Always Below 1 Ω e71-12 (FDWN) - e101-4 (DOWN) Always Below 1 Ω e72-1 (FUP) - Body ground Always 10 kΩ or higher e71-12 (FDWN) - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
16. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

17. Click here

    REPLACE FRONT POWER SEAT SWITCH (for Driver Side)Click here

18. Click here

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (for Driver Side)Click here

19. Click here

    REPLACE FRONT POWER SEAT SWITCH (for Passenger Side)Click here

20. Click here

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY (for Passenger Side)Click here

21. Click here

    USE SIMULATION METHOD TO CHECKClick here