FRONT POWER SEAT CONTROL SYSTEM (for LHD) Power Seat Power Easy Access System Function does not Operate

DESCRIPTION

for Driver Side:

• When the power switch is off and the shift lever is in P, the power seat slides rearwards when the seat belt tongue plate is disengaged from the front seat inner belt assembly LH (auto away function). Also the power seat slides forward when the seat belt tongue plate is engaged to the front seat inner belt assembly LH with the power switch on (ACC) or on (IG), or the shift lever in P.

for Front Passenger Side:

• When the vehicle is being driven at a speed below 4 km/h (2.49 mph) and the passenger door is opened, check that the lumbar support, pelvis support and side support move rearwards.

WIRING DIAGRAM

1. for Driver Side (Standard Seat Type):

   

2. for Driver Side (Sports Seat Type, Luxury Seat Type):

   

3. for Front Passenger Side (Luxury Seat Type):

   

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FRONT POWER SEAT OPERATION

   
   

   1. Check that each function of the power seat operates normally by using the front power seat switch Click here.

      OK
      Each function of power seat operates normally by using seat switches.

      Result

      Result	Proceed to
      Power seat functions operate normally	A
      All power seat functions do not operate	B
      One or more power seat motors do not operate	C

   
   

   B

   GO TO PROBLEM SYMPTOMS TABLE (Front Power Seat does not Operate with Front Power Seat Switch) Click here

   C

   GO TO PROBLEM SYMPTOMS TABLE (One or more Power Seat Motors do not Operate) Click here

   A

2. CHECK SEAT POSITION MEMORY FUNCTION

   
   

   1. Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation Click here.

      Note

      
      

      • The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.

      • If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

      OK
      Seat position memory function operates normally.

      Result

      Result	Proceed to
      OK (for Driver Side)	A
      OK (for Front Passenger Side)	B
      NG	C

   
   

   B

   READ VALUE USING GTS (DOOR COURTESY) Click here

   C

   GO TO PROBLEM SYMPTOMS TABLE Click here

   A

3. READ VALUE USING GTS (DRIVER SEAT BUCKLE SW)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Driver Seat / Data List.

   5. Read the Data List according to the display on the GTS.

      Driver Seat

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Driver Seat Buckle SW	Status of the driver's seat belt / ON or OFF	ON: Tongue plate is engaged OFF: Tongue plate is not engaged	-

      OK
      "ON" and "OFF" appears on the screen.

      Result

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

   
   

   B

   REPLACE POSITION CONTROL ECU ASSEMBLY Click here

   C

   INSPECT FRONT SEAT INNER BELT ASSEMBLY LH Click here

   A

4. REPLACE POWER SEAT SWITCH ASSEMBLY

   
   

   1. Temporarily replace the power seat switch assembly with a new or normally functioning one Click here.

   
   

   NEXT

5. CHECK POWER SEAT POWER EASY ACCESS SYSTEM

   
   

   1. Check that the power seat easy access system operates normally when engaging and disengaging the tongue plate of the seat belt with the shift lever in P Click here.

      OK
      Power seat power easy access system is normal.

   
   

   NG

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

   OK

   END (POWER SEAT SWITCH ASSEMBLY WAS DEFECTIVE)

6. REPLACE POSITION CONTROL ECU ASSEMBLY

   
   

   1. Temporarily replace the position control ECU assembly with a new or normally functioning one.

      
      

      • for Sports Seat Type : Click here

      • for Luxury Seat Type : Click here

   
   

   NEXT

7. CHECK POWER SEAT POWER EASY ACCESS SYSTEM

   
   

   1. Check that the power seat easy access system operates normally when engaging and disengaging the tongue plate of the seat belt with the shift lever in P Click here.

      OK
      Power seat power easy access system is normal.

   
   

   NG

   REPLACE POSITION CONTROL ECU ASSEMBLY Click here

   OK

   END (POSITION CONTROL ECU ASSEMBLY WAS DEFECTIVE)

8. INSPECT FRONT SEAT INNER BELT ASSEMBLY LH

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Front Seat Inner Belt Assembly LH)

      Remove the front seat inner belt assembly LH Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 5 (RDC) - 4 (E) Tongue plate is engaged Below 1 Ω 5 (RDC) - 4 (E) Tongue plate is not engaged 10 kΩ or higher

      Result

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

   
   

   B

   CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT INNER BELT ASSEMBLY LH AND GROUND) Click here

   C

   REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

   A

9. CHECK HARNESS AND CONNECTOR (POWER SEAT SWITCH ASSEMBLY - FRONT SEAT INNER BELT ASSEMBLY LH AND BODY GROUND)

   
   

   1. Disconnect the d16 power seat switch assembly connector.

   2. Disconnect the d1 front seat inner belt assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition d16-10 (DBCL) - d1-5 (RDC) Always Below 1 Ω d1-4 (E) - Body ground Always Below 1 Ω d16-10 (DBCL) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE POWER SEAT SWITCH ASSEMBLY Click here

10. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT INNER BELT ASSEMBLY LH AND GROUND)

    
    

    1. Disconnect the d5 position control ECU assembly connector.

    2. Disconnect the d1 front seat inner belt assembly LH connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition d5-13 (DBCL) - d1-5 (RDC) Always Below 1 Ω d1-4 (E) - Body ground Always Below 1 Ω d5-13 (DBCL) - Body ground Always 10 kΩ or higher

       Result

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

    
    

    B

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE POWER SEAT SWITCH ASSEMBLY Click here

11. READ VALUE USING GTS (DOOR COURTESY)

    
    

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.

       Main Body

       Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
       FR Door Courtesy	Front door courtesy light switch assembly RH signal / ON or OFF	ON: Front door RH closed OFF: Front door RH open	-

       OK
       "ON" and "OFF" appears on the screen.

    
    

    NG

    INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSEMBLY RH Click here

    OK

12. READ VALUE USING GTS (P-DOOR COURTESY)

    
    

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Passenger Seat / Data List.

    5. Read the Data List according to the display on the GTS.

       Passenger Seat

       Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
       P-Door Courtesy	Front door courtesy light switch assembly RH signal / ON or OFF	ON: Front door RH closed OFF: Front door RH open	-

       OK
       "ON" and "OFF" appears on the screen.

    
    

    NG

    CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

13. READ VALUE USING GTS (VEHICLE SPEED)

    
    

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Passenger Seat / Data List.

    5. Read the Data List according to the display on the GTS.

       Passenger Seat

       Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
       Vehicle Speed	Vehicle speed / Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph)	Almost same as actual vehicle speed	-

       OK
       Almost same as actual vehicle speed

    
    

    NG

    CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

14. CHECK POSITION CONTROL ECU ASSEMBLY

    
    

    1. Temporarily replace the position control ECU assembly with a new or normally functioning one Click here.

    2. Check that the power seat easy access system operates normally Click here.

       OK
       Power seat power easy access system is normal.

    
    

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

    END (POSITION CONTROL ECU ASSEMBLY WAS DEFECTIVE)

15. INSPECT FRONT DOOR COURTESY LAMP SWITCH ASSEMBLY RH

    
    
    1. 

       Text in Illustration

       *a	Component without harness connected (Front Door Courtesy Light Switch Assembly LH)

       Remove the front door courtesy light switch RH Click here.

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

       Standard Resistance
       Tester Connection Condition Specified Condition 1 - Switch body Pin not pushed Below 1 Ω Pin pushed 10 kΩ or higher

    
    

    NG

    REPLACE FRONT DOOR COURTESY LAMP SWITCH ASSEMBLY RH Click here

    OK

16. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH)

    
    

    1. Disconnect the A main body ECU (multiplex network body ECU) connector.

    2. Disconnect the T6 front door courtesy light switch assembly RH connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition A-4 (FRCY) - T6-1 Always Below 1 Ω A-4 (FRCY) - Body ground Always 10 kΩ or higher

    
    

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH) Click here

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

17. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY RH)

    
    

    1. Disconnect the 5A cowl side junction block LH connector.

    2. Disconnect the T6 front door courtesy light switch assembly RH connector.

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

       Standard Resistance
       Tester Connection Condition Specified Condition 5A-33 (FRCY) - T6-1 Always Below 1 Ω 5A-33 (FRCY) - Body ground Always 10 kΩ or higher

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

18. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    
    

    1. Temporarily replace the main body ECU (multiplex network body ECU) with a new one Click here.

    2. Check that the power seat easy access system operates normally Click here.

       OK
       Power seat power easy access system is normal.

    
    

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    OK

    END (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] WAS DEFECTIVE)