RM38N0EC _58 Vehicle Interior _111839 SEAT _0505694 FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) J

SEAT  FRONT POWER SEAT CONTROL SYSTEM(w/ Memory)  Power Seat does not Return to Memorized Position  


DESCRIPTION

When the M1 or M2 switch of the seat memory switch is pressed, the outer mirror control ECU assembly LH sends a switch signal to the main body ECU (multiplex network body ECU) via CAN communication. Then, the main body ECU (multiplex network body ECU) sends a recall request signal to the position control ECU assembly. The position control ECU assembly operates each motor to move the seat to the memorized position.

WIRING DIAGRAM

B570110E19
0.083,1.198 2.042,1.656 1.958,0.458 10 false Position Control ECU Assembly 0.198,2.688 1.823,3.021 1.625,0.333 10 false Main Body ECU (Multiplex Network Body ECU) 3.24,2.802 4.823,3.208 1.583,0.406 10 false Outer Mirror Control ECU Assembly LH 5.583,2.802 6.875,3.271 1.292,0.469 10 false Seat Memory Switch 4.323,0.458 4.969,0.74 0.646,0.281 10 false M1 4.323,1.021 4.969,1.302 0.646,0.281 10 false M2 4.281,1.604 4.927,1.885 0.646,0.281 10 false MM 4.219,2.167 4.865,2.448 0.646,0.281 10 false GND 5.552,1.5 6.198,1.906 0.646,0.406 10 false MMRY 5.531,2.073 6.177,2.354 0.646,0.281 10 false E 5.552,0.323 6.271,0.531 0.719,0.208 10 false 1 5.563,0.917 5.938,1.271 0.375,0.354 10 false 2 4.615,0.354 5.26,0.635 0.646,0.281 10 false 2 4.625,0.938 5.271,1.219 0.646,0.281 10 false 3 4.625,1.51 5.271,1.792 0.646,0.281 10 false 1 4.625,2.073 5.271,2.354 0.646,0.281 10 false 7 5.365,1.5 6.01,1.781 0.646,0.281 10 false 3 5.365,0.938 6.01,1.219 0.646,0.281 10 false 4 5.344,0.333 5.99,0.615 0.646,0.281 10 false 2 5.344,2.083 5.99,2.365 0.646,0.281 10 false 1 3.25,2.625 4.219,2.906 0.969,0.281 10 false G22 5.594,2.646 6.573,2.927 0.979,0.281 10 false I7 0.698,3.375 2.667,3.594 1.969,0.219 10 false : CAN Communication Line

CAUTION / NOTICE / HINT

NOTICE:
·

The interference prevention function stops the recall operation when the head restraint may contact the roof headlining during a recall operation.

·

The seat position will not be stored 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 of the switches. The seat memory function will not operate unless the switches are released.

·

The seat will not return to the memorized position if 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.

If a restoring operation has failed, release all of the switches. The seat memory restoring function will not operate unless the switches are released.

·

The front power seat control system (w/ Memory) uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>HOW TO PROCEED WITH TROUBLESHOOTING

·

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.



PROCEDURE

1.CHECK FRONT POWER SEAT CONTROL OPERATION
a.

Check that each function of the power seat operates normally by using the front power seat switch LH.

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>OPERATION CHECK

OK:

Each function of the power seat operates normally using the front power seat switch LH.



Result:
Proceed to
OK
NG



OK

2.CHECK SEAT POSITION MEMORY FUNCTION

NG

GO TO PROBLEM SYMPTOMS TABLE

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>PROBLEM SYMPTOMS TABLE


2.CHECK SEAT POSITION MEMORY FUNCTION
a.

Check the seat position memory function.

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>OPERATION CHECK

OK:

Seat position memory function is normal.



Result:
Proceed to
OK
NG



OK

3.CHECK SEAT POSITION RESTORING FUNCTION

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized)

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>Power Seat Position is not Memorized


3.CHECK SEAT POSITION RESTORING FUNCTION
a.

Under each of the following conditions, check that the seat position restoring function operates by pressing the M1 or M2 switch.

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>OPERATION CHECK

·

The ignition switch is ON, and the shift lever is in P.*1

·

Within 180 seconds after the driver door is opened with the ignition switch off.*2

·

Within 60 seconds after the driver door is opened and then closed with the ignition switch off.*3



Result:
Result Proceed to
Seat position restoring function does not operate at all. A
Seat position restoring function does not operate when the condition is *1. B
·

Seat position restoring function does not operate when the condition is *2.

·

Seat position restoring function does not operate when the condition is *3.


C



A

4.READ VALUE USING GTS (SEAT POSITION MEMORY)

B

7.READ VALUE USING GTS (SHIFT P POSITION)

C

10.READ VALUE USING GTS (FL DOOR COURTESY SWITCH STATUS)
4.READ VALUE USING GTS (SEAT POSITION MEMORY)
a.

Store a seat position in memory for the M1 and M2 switches.

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>OPERATION CHECK


b.

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

Body Electrical > Driver Seat > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Memory No1 Seat position memorized with M1 switch Not Mem or Mem Not Mem: Not memorized
Mem: Memorized 		-
Memory No2 Seat position memorized with M2 switch Not Mem or Mem Not Mem: Not memorized
Mem: Memorized 		-
Body Electrical > Driver Seat > Data List
Tester Display
Memory No1
Memory No2
50003 162 700,701
OK:

Mem is displayed on the GTS screen.



Result:
Proceed to
OK
NG



OK

5.REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Power Seat Position is not Memorized)

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>Power Seat Position is not Memorized


5.REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH
a.

Replace the outer mirror control ECU assembly LH with a new or known good one.

Click hereVehicle Exterior>MIRROR (EXT)>OUTER MIRROR CONTROL ECU>REMOVAL


Result:
Proceed to
NEXT



NEXT

6.CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION
6.CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION
a.

Check the seat position memory and restoring functions.

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>OPERATION CHECK

OK:

Seat position memory and restoring functions operate normally.



Result:
Proceed to
OK
NG



OK

END (OUTER MIRROR CONTROL ECU ASSEMBLY LH WAS DEFECTIVE)

NG

8.REPLACE POSITION CONTROL ECU ASSEMBLY
7.READ VALUE USING GTS (SHIFT P POSITION)
a.

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

Powertrain > Hybrid Control > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Shift Position Current shift state P / R / N / D / B Matches currently selected shift state:
P, R, N, D 		Shift state
Powertrain > Hybrid Control > Data List
Tester Display
Shift Position
50003 397 231

OK:

On the GTS screen, ON or OFF is displayed accordingly.


Result:
Proceed to
OK
NG



OK

8.REPLACE POSITION CONTROL ECU ASSEMBLY

NG

GO TO HYBRID CONTROL SYSTEM (P070562)

for 2WD: Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM (for 2WD)>P070562

for 4WD: Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM (for AWD)>P070562


9.CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION
a.

Check the seat position memory and restoring functions.

Click hereVehicle Interior>SEAT>FRONT POWER SEAT CONTROL SYSTEM (w/ Memory)>OPERATION CHECK

OK:

Seat position memory and restoring functions operate normally.



Result:
Proceed to
OK
NG



OK

END (POSITION CONTROL ECU ASSEMBLY WAS DEFECTIVE)

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


10.READ VALUE USING GTS (FL DOOR COURTESY SWITCH STATUS)
a.

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

Body Electrical > Main Body > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
FL Door Courtesy Switch Status Front door courtesy light switch assembly (LH) signal Close or Open Open: Front door LH open
Close: Front door LH closed 		-
Body Electrical > Main Body > Data List
Tester Display
FL Door Courtesy Switch Status
50003 449 31
OK:

On the GTS screen, ON or OFF is displayed accordingly.



Result:
Proceed to
OK
NG



OK

REPLACE POSITION CONTROL ECU ASSEMBLY

for SFTM Made: Click hereVehicle Interior>SEAT>POWER SEAT CONTROL ECU (for SFTM Made)>REMOVAL

for GTMC Made: Click hereVehicle Interior>SEAT>POWER SEAT CONTROL ECU (for GTMC Made)>REMOVAL


NG

GO TO LIGHTING SYSTEM (Front Door Courtesy Switch Circuit)

Click hereVehicle Interior>LIGHTING (INT)>LIGHTING SYSTEM>Front Door Courtesy Switch Circuit