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

SEAT  FRONT POWER SEAT CONTROL SYSTEM(w/ Memory)  B2651  Reclining Sensor Malfunction  


DESCRIPTION

When the position control ECU assembly does not receive a reclining motor position sensor signal despite the seat having been moved forward or rearward by power seat motor operation, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2651 Reclining Sensor Malfunction Reclining motor position sensor signal not received when power seat moved forward or rearward
·

Position control ECU assembly

·

Reclining motor (front seat back frame sub-assembly LH)

·

Wire harness or connector



WIRING DIAGRAM

for SFTM Made


B605540E07
1.146,2.479 2.219,2.698 1.073,0.219 10 false V12 4.802,1.063 5.26,1.26 0.458,0.198 10 false U34 4.813,0.542 5.271,0.74 0.458,0.198 10 false U33 4.802,2.083 5.26,2.281 0.458,0.198 10 false U35 4.802,1.573 5.26,1.771 0.458,0.198 10 false U35 5.219,0.542 5.833,0.74 0.615,0.198 10 false RCL+ 5.219,1.052 5.833,1.25 0.615,0.198 10 false RCL- 5.229,1.563 5.844,1.76 0.615,0.198 10 false HALL+ 5.229,2.083 5.844,2.281 0.615,0.198 10 false SGND 1.146,2.656 2.833,2.854 1.688,0.198 10 false Reclining Motor 4.75,2.594 6.948,2.875 2.198,0.281 10 false Position Control ECU Assembly 0.333,3.083 4.323,3.365 3.99,0.281 10 false Front Seat Back Frame Sub-assembly LH 4.844,0.313 5.052,0.521 0.208,0.208 10 false 10 4.896,0.823 5.052,1.021 0.156,0.198 10 false 6 4.844,1.333 5.156,1.531 0.313,0.198 10 false 11 4.833,1.844 5.146,2.042 0.313,0.198 10 false 12 2.323,1.458 3,1.708 0.677,0.25 10 false 4 2.323,0.438 2.938,0.719 0.615,0.281 10 false 3 2.313,0.958 3.042,1.198 0.729,0.24 10 false 1 2.313,1.979 3.125,2.281 0.813,0.302 10 false 2


for GTMC Made


B591059E69
1.146,2.479 2.219,2.698 1.073,0.219 10 false V19 4.802,1.063 5.26,1.26 0.458,0.198 10 false U34 4.813,0.542 5.271,0.74 0.458,0.198 10 false U54 4.802,2.083 5.26,2.281 0.458,0.198 10 false U35 4.802,1.573 5.26,1.771 0.458,0.198 10 false U35 5.219,0.542 5.833,0.74 0.615,0.198 10 false RCL+ 5.219,1.052 5.833,1.25 0.615,0.198 10 false RCL- 5.229,1.563 5.844,1.76 0.615,0.198 10 false SSRR 5.229,2.083 5.844,2.281 0.615,0.198 10 false SGND 1.146,2.656 2.833,2.854 1.688,0.198 10 false Reclining Motor 4.75,2.594 6.948,2.875 2.198,0.281 10 false Position Control ECU Assembly 0.333,3.083 4.323,3.365 3.99,0.281 10 false Front Seat Back Frame Sub-assembly LH 4.844,0.313 5.052,0.521 0.208,0.208 10 false 10 4.896,0.823 5.052,1.021 0.156,0.198 10 false 6 4.844,1.333 5.156,1.531 0.313,0.198 10 false 11 4.833,1.844 5.146,2.042 0.313,0.198 10 false 12 2.323,1.458 3,1.708 0.677,0.25 10 false 2 2.323,0.438 2.938,0.719 0.615,0.281 10 false 4 2.313,0.958 3.042,1.198 0.729,0.24 10 false 1 2.313,1.979 3.125,2.281 0.813,0.302 10 false 3


PROCEDURE

1.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Driver Seat > Clear DTCs
50002 162

Result:
Proceed to
NEXT



NEXT

2.CHECK FOR DTC
2.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Driver Seat > Trouble Codes
50001 162
OK:

DTC B2651 is not output.



Result:
Result Proceed to
DTC B2651 is not output A
DTC B2651 output B



A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

3.PERFORM ACTIVE TEST USING GTS (SEAT RECLINING OPERATION)
3.PERFORM ACTIVE TEST USING GTS (SEAT RECLINING OPERATION)
a.

Perform the Active Test according to the display on the GTS.

Body Electrical > Driver Seat > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Seat Reclining Seat reclining operation OFF/Rear/Front -
Body Electrical > Driver Seat > Active Test
Tester Display
Seat Reclining
50004 162 1
OK:

Reclining motor operates normally.



Result:
Proceed to
OK
NG



OK

4.CHECK POSITION CONTROL ECU ASSEMBLY (RECLINING MOTOR CIRCUIT)

NG

7.INSPECT RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH)
4.CHECK POSITION CONTROL ECU ASSEMBLY (RECLINING MOTOR CIRCUIT)
a.

Disconnect the V12*1 or V19*2 reclining motor (front seat back frame sub-assembly LH) connector.

*1: for SFTM Made

*2: for GTMC Made



b.

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

Standard Voltage:
for SFTM Made
Tester Connection Condition Specified Condition

Click Location & Routing(V12)Location & Routing

Click Connector(V12)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Reclining Motor (Front Seatback Frame Sub-Assembly LH)

V12-4 - V12-2 Reclining switch on 4.8 to 5.1 V

for GTMC Made
Tester Connection Condition Specified Condition

Click Location & Routing(V19)Location & Routing

Click Connector(V19)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Reclining Motor (Front Seatback Frame Sub-Assembly LH)

V19-2 - V19-3 Reclining switch on 4.8 to 5.1 V



Result:
Proceed to
OK
NG



OK

5.CHECK RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH)

NG

6.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH))
5.CHECK RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH)
a.
B647833C01
1.531,0.125 1.938,0.396 0.406,0.271 1.542,1.813 1.948,2.083 0.406,0.271 1.625,1.865 2.083,2.063 0.458,0.198 10 false V19 1.615,0.177 2.073,0.375 0.458,0.198 10 false V12 0.24,0.177 0.698,0.375 0.458,0.198 10 false *a 2,0.188 2.458,0.385 0.458,0.198 10 false *A 2.01,1.865 2.469,2.063 0.458,0.198 10 false *B
*A for SFTM Made
*B for GTMC Made
*a Component with harness connected
(Reclining Motor (Front Seat Back Frame Sub-assembly LH))


Reconnect the V12*1 or V19*2 reclining motor (front seat back frame sub-assembly LH) connector.

*1: for SFTM Made

*2: for GTMC Made



b.

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

Standard Voltage:
for SFTM Made
Tester Connection Condition Specified Condition

Click Location & Routing(V12)Location & Routing

Click Connector(V12)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Reclining Motor (Front Seatback Frame Sub-Assembly LH)

V12-4 - Body ground Reclining motor operating 4.5 to 4.8 V

for GTMC Made
Tester Connection Condition Specified Condition

Click Location & Routing(V19)Location & Routing

Click Connector(V19)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Reclining Motor (Front Seatback Frame Sub-Assembly LH)

V19-2 - Body ground Reclining motor operating 4.5 to 4.8 V



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

REPLACE RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH)

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


6.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH))
a.

Disconnect the U35 position control ECU assembly connector.


b.

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

Standard Resistance:
for SFTM Made
Tester Connection Condition Specified Condition

Click Location & Routing(U35,V12)Location & Routing

Click Connector(U35)Seat>Front Seat Wire RH / Front Seat Wire LH>Position Control ECU Assembly LH

Click Connector(V12)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Reclining Motor (Front Seatback Frame Sub-Assembly LH)

U35-11 (HALL+) - V12-4 Always Below 1 Ω
U35-11 (HALL+) or V12-4 - Body ground Always 10 kΩ or higher
U35-12 (SGND) - V12-2 Always Below 1 Ω
U35-12 (SGND) or V12-2 - Body ground Always 10 kΩ or higher

for GTMC Made
Tester Connection Condition Specified Condition

Click Location & Routing(U35,V19)Location & Routing

Click Connector(U35)Seat>Front Seat Wire RH / Front Seat Wire LH>Position Control ECU Assembly LH

Click Connector(V19)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Reclining Motor (Front Seatback Frame Sub-Assembly LH)

U35-11 (SSRR) - V19-2 Always Below 1 Ω
U35-11 (SSRR) or V19-2 - Body ground Always 10 kΩ or higher
U35-12 (SGND) - V19-3 Always Below 1 Ω
U35-12 (SGND) or V19-3 - Body ground Always 10 kΩ or higher



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

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.INSPECT RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH)

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>INSPECTION

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>INSPECTION

Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH))

NG

REPLACE RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH)

for SFTM Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for SFTM Made Power Seat)>DISASSEMBLY

for GTMC Made: Click hereVehicle Interior>SEAT>FRONT SEAT ASSEMBLY (for GTMC Made Power Seat)>DISASSEMBLY


8.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - RECLINING MOTOR (FRONT SEAT BACK FRAME SUB-ASSEMBLY LH))
a.

Disconnect the U33*1 or U54*2 and U34 position control ECU assembly connectors.

*1: for SFTM Made

*2: for GTMC Made



b.

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

Standard Resistance:
for SFTM Made
Tester Connection Condition Specified Condition

Click Location & Routing(U33,V12,U34)Location & Routing

Click Connector(U33)Seat>Front Seat Wire RH / Front Seat Wire LH>Position Control ECU Assembly LH

Click Connector(V12)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Reclining Motor (Front Seatback Frame Sub-Assembly LH)

Click Connector(U34)Seat>Front Seat Wire RH / Front Seat Wire LH>Position Control ECU Assembly LH

U33-10 (RCL+) - V12-3 Always Below 1 Ω
U33-10 (RCL+) or V12-3 - Body ground Always 10 kΩ or higher
U34-6 (RCL-) - V12-1 Always Below 1 Ω
U34-6 (RCL-) or V12-1 - Body ground Always 10 kΩ or higher

for GTMC Made
Tester Connection Condition Specified Condition

Click Location & Routing(U54,V19,U34)Location & Routing

Click Connector(U54)Seat>Front Seat Wire RH / Front Seat Wire LH>Position Control ECU Assembly LH

Click Connector(V19)Seat>No. 2 Front Seat Wire RH / No. 2 Front Seat Wire LH>Reclining Motor (Front Seatback Frame Sub-Assembly LH)

Click Connector(U34)Seat>Front Seat Wire RH / Front Seat Wire LH>Position Control ECU Assembly LH

U54-10 (RCL+) - V19-4 Always Below 1 Ω
U54-10 (RCL+) or V19-4 - Body ground Always 10 kΩ or higher
U34-6 (RCL-) - V19-1 Always Below 1 Ω
U34-6 (RCL-) or V19-1 - Body ground Always 10 kΩ or higher



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

REPAIR OR REPLACE HARNESS OR CONNECTOR