Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Slide Sensor Malfunction (B2650)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Seat / Front Power Seat Control System (w/ Memory) / Slide Sensor Malfunction (B2650)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2650

Slide Sensor Malfunction

The forward and backward lock detection position of slide motor position sensor is the same.
  • Position control ECU and switch assembly LH
  • Slide motor (Front seat adjuster assembly LH)
  • Wire harness or connector

WIRING DIAGRAM

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Driver Seat > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Driver Seat > Trouble Codes

OK:

DTC B2650 is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

3.

PERFORM ACTIVE TEST USING TECHSTREAM (SLIDE MOTOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Driver Seat / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Driver Seat > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Seat Slide Operation

Seat slide operation

OFF/Rear/Front

-
Body Electrical > Driver Seat > Active Test

Tester Display

Seat Slide Operation

OK:

Motor operates normally.

NG

GO TO STEP 7

OK

4.

CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY LH (SLIDE MOTOR CIRCUIT)

(a) Disconnect the c1 slide motor (front seat adjuster assembly LH) connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

c1-2 (O/P) - c1-3 (GND)

Slide switch on

4.8 to 5.1 V
NG

GO TO STEP 6

OK

5.

CHECK SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH)

(a) Reconnect the c1 slide motor (front seat adjuster assembly LH) connector.

*a

Component with harness connected

(Slide Motor (Front Seat Adjuster Assembly LH)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

c1-2 (O/P) - Body ground

Slide motor operating

4.5 to 4.8 V
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH

NG

REPLACE SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH)

6.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY LH - SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH))

(a) Disconnect the c6 position control ECU and switch assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

c6-5 (SSRS) - c1-2 (O/P)

Always

Below 1 Ω

c6-5 (SSRS) or c1-2 (O/P) - Body ground

Always

10 kΩ or higher

c6-1 (SGND) - c1-3 (GND)

Always

Below 1 Ω

c6-1 (SGND) or c1-3 (GND) - Body ground

Always

10 kΩ or higher
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH)

(a) Remove the front seat adjuster assembly LH.

Click here

(b) Inspect the front seat adjuster assembly LH (slide motor).

Click here

NG

REPLACE SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH)

OK

8.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY LH - SLIDE MOTOR (FRONT SEAT ADJUSTER ASSEMBLY LH))

(a) Disconnect the c5 position control ECU and switch assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

c5-3 (SLD+) - c1-4 (FWD)

Always

Below 1 Ω

c5-3 (SLD+) or c1-4 (FWD) - Body ground

Always

10 kΩ or higher

c5-4 (SLD-) - c1-1 (BACK)

Always

Below 1 Ω

c5-4 (SLD-) or c1-1 (BACK) - Body ground

Always

10 kΩ or higher
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Diagnostic Trouble Code Chart
    DIAGNOSTIC TROUBLE CODE CHART Front Power Seat Control System (w/ Memory) DTC No. Detection Item Link B2650 Slide Sensor Malfunction B2658 Short in Sensor with Motor Power Supp ...

    Short in Sensor with Motor Power Supply Circuit (B2658)
    DESCRIPTION This DTC is stored when the slide motor is being operated (the slide motor position sensor is being supplied with power) and the power supply voltage does not rise to the specified value. ...

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