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

SEAT  FRONT POWER SEAT CONTROL SYSTEM(w/ Memory)  B2653  Lifter Sensor Malfunction  


DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area
B2653 Lifter Sensor Malfunction Lifter motor position sensor signal not received when power seat moved upward or downward
·

Position control ECU assembly

·

Lifter motor (front seat adjuster assembly LH)

·

Wire harness or connector



WIRING DIAGRAM

for SFTM Made


B521828E36
0.802,2.458 1.781,2.729 0.979,0.271 10 false U32 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 LFT+ 5.219,1.052 5.833,1.25 0.615,0.198 10 false LFT- 5.229,1.563 5.844,1.76 0.615,0.198 10 false SSRL 5.229,2.083 5.844,2.281 0.615,0.198 10 false SGND 0.802,2.615 2.667,3 1.865,0.385 10 false Lifter Motor (Front Seat Adjuster Assembly LH) 4.75,2.594 7.031,2.896 2.281,0.302 10 false Position Control ECU Assembly 4.885,0.313 5.042,0.51 0.156,0.198 10 false 6 4.896,0.823 5.052,1.021 0.156,0.198 10 false 5 4.844,1.333 5.156,1.531 0.313,0.198 10 false 25 4.833,1.844 5.146,2.042 0.313,0.198 10 false 12 2.333,2 3.083,2.292 0.75,0.292 10 false 2 2.313,0.969 3.167,1.333 0.854,0.365 10 false 1 2.323,1.5 3.167,1.906 0.844,0.406 10 false 4 2.313,0.469 3.198,0.74 0.885,0.271 10 false 3


for GTMC Made


B521828E52
0.802,2.479 1.781,2.75 0.979,0.271 10 false U50 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 LFT+ 5.219,1.052 5.833,1.25 0.615,0.198 10 false LFT- 5.229,1.563 5.844,1.76 0.615,0.198 10 false SSRL 5.229,2.083 5.844,2.281 0.615,0.198 10 false SGND 0.813,2.656 2.677,3.042 1.865,0.385 10 false Lifter Motor (Front Seat Adjuster Assembly LH) 4.729,2.604 7.01,2.906 2.281,0.302 10 false Position Control ECU Assembly 4.875,0.302 5.031,0.5 0.156,0.198 10 false 6 4.885,0.823 5.042,1.021 0.156,0.198 10 false 5 4.844,1.333 5.156,1.531 0.313,0.198 10 false 25 4.833,1.844 5.146,2.042 0.313,0.198 10 false 12 2.344,1.99 3.094,2.281 0.75,0.292 10 false 3 2.333,0.948 3.188,1.313 0.854,0.365 10 false 4 2.333,1.479 3.177,1.885 0.844,0.406 10 false 2 2.323,0.438 3.208,0.708 0.885,0.271 10 false 1


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 B2653 is not output.



Result:
Result Proceed to
DTC B2653 is not output A
DTC B2653 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 LIFTER OPERATION)
3.PERFORM ACTIVE TEST USING GTS (SEAT LIFTER 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
Lifter Operation Seat lifter operation OFF/Down/Up -
Body Electrical > Driver Seat > Active Test
Tester Display
Lifter Operation
50004 162 2
OK:

Lifter motor operates normally.



Result:
Proceed to
OK
NG



OK

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

NG

7.INSPECT LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH)
4.CHECK POSITION CONTROL ECU ASSEMBLY (LIFTER MOTOR CIRCUIT)
a.

Disconnect the U32*1 or U50*2 lifter motor (front seat adjuster 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(U32)Location & Routing

Click Connector(U32)Seat>Front Seat Wire RH / Front Seat Wire LH>Power Seat Lifter Motor Assembly LH

U32-4 - U32-2 Lifter switch on 4.8 to 5.1 V

for GTMC Made
Tester Connection Condition Specified Condition

Click Location & Routing(U50)Location & Routing

Click Connector(U50)Seat>Front Seat Wire RH / Front Seat Wire LH>Power Seat Lifter Motor Assembly LH

U50-2 - U50-3 Lifter switch on 4.8 to 5.1 V



Result:
Proceed to
OK
NG



OK

5.CHECK LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH)

NG

6.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH))
5.CHECK LIFTER MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH)
a.
B647833C03
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 U50 1.615,0.188 2.073,0.385 0.458,0.198 10 false U32 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
(Lifter Motor (Front Seat Adjuster Assembly LH))


Reconnect the U32*1 or U50*2 lifter motor (front seat adjuster 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(U32)Location & Routing

Click Connector(U32)Seat>Front Seat Wire RH / Front Seat Wire LH>Power Seat Lifter Motor Assembly LH

U32-4 - Body ground Lifter motor operating 4.5 to 4.8 V

for GTMC Made
Tester Connection Condition Specified Condition

Click Location & Routing(U50)Location & Routing

Click Connector(U50)Seat>Front Seat Wire RH / Front Seat Wire LH>Power Seat Lifter Motor Assembly LH

U50-2 - Body ground Lifter 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 LIFTER MOTOR (FRONT SEAT ADJUSTER 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 - LIFTER MOTOR (FRONT SEAT ADJUSTER 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,U32)Location & Routing

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

Click Connector(U32)Seat>Front Seat Wire RH / Front Seat Wire LH>Power Seat Lifter Motor Assembly LH

U35-25 (SSRL) - U32-4 Always Below 1 Ω
U35-25 (SSRL) or U32-4 - Body ground Always 10 kΩ or higher
U35-12 (SGND) - U32-2 Always Below 1 Ω
U35-12 (SGND) or U32-2 - Body ground Always 10 kΩ or higher

for GTMC Made
Tester Connection Condition Specified Condition

Click Location & Routing(U35,U50)Location & Routing

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

Click Connector(U50)Seat>Front Seat Wire RH / Front Seat Wire LH>Power Seat Lifter Motor Assembly LH

U35-25 (SSRL) - U50-2 Always Below 1 Ω
U35-25 (SSRL) or U50-2 - Body ground Always 10 kΩ or higher
U35-12 (SGND) - U50-3 Always Below 1 Ω
U35-12 (SGND) or U50-3 - 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

8.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LIFTER MOTOR (FRONT SEAT ADJUSTER 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,U32,U34)Location & Routing

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

Click Connector(U32)Seat>Front Seat Wire RH / Front Seat Wire LH>Power Seat Lifter Motor Assembly LH

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

U33-6 (LFT+) - U32-3 Always Below 1 Ω
U33-6 (LFT+) or U32-3 - Body ground Always 10 kΩ or higher
U34-5 (LFT-) - U32-1 Always Below 1 Ω
U34-5 (LFT-) or U32-1 - Body ground Always 10 kΩ or higher

for GTMC Made
Tester Connection Condition Specified Condition

Click Location & Routing(U54,U50,U34)Location & Routing

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

Click Connector(U50)Seat>Front Seat Wire RH / Front Seat Wire LH>Power Seat Lifter Motor Assembly LH

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

U54-6 (LFT+) - U50-1 Always Below 1 Ω
U54-6 (LFT+) or U50-1 - Body ground Always 10 kΩ or higher
U34-5 (LFT-) - U50-4 Always Below 1 Ω
U34-5 (LFT-) or U50-4 - 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