Toyota Tundra Service Manual: Lifter Sensor Malfunction (B2653)

DESCRIPTION

When the position control ECU and switch assembly does not receive a sensor signal despite upward or downward movement of the seat by power seat motor operation, this DTC is stored.

DTC Code

DTC Detection Condition

Trouble Area

B2653

The upward and downward lock detection position of the sensor is the same.

  • Position control ECU and switch assembly
  • Front seat cushion frame sub-assembly RH (lifter motor)
  • Harness or connector

WIRING DIAGRAM

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (LIFTER OPERATION)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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.

Driver Seat

Tester Display

Test Part

Control Range

Diagnostic Note

Lifter Operation

Seat lifter operation

Up / OFF / Down

-

OK:

Motor operates normally.

NG

GO TO STEP 5

OK

2.

CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (LIFTER MOTOR CIRCUIT)

(a) Disconnect the front seat cushion frame sub-assembly LH (lifter motor) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z4-3 - Z4-4

Lifter switch on

4.8 to 5.1 V

Text in Illustration

*a

Front view of wire harness connector

(to Front Seat Cushion Frame Sub-assembly [Lifter Motor])

NG

GO TO STEP 4

OK

3.

CHECK FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH (LIFTER MOTOR)

(a) Reconnect the front seat cushion frame sub-assembly LH (lifter motor) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z4-4 - Body ground

Lifter switch on

4.5 to 4.8 V

Text in Illustration

*a

Component with harness connected

(Front Seat Cushion Frame Sub-assembly LH [Lifter Motor])

OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

NG

REPLACE FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH

4.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH)

(a) Disconnect the Z10 position control ECU and switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z10-4 (SSRL) - Z4-4

Always

Below 1 Ω

Z10-1 (SGND) - Z4-3

Always

Below 1 Ω

Z10-4 (SSRL) or Z4-4 - Body ground

Always

10 kΩ or higher

Z10-1 (SGND) or Z4-3 - Body ground

Always

10 kΩ or higher

OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH (LIFTER MOTOR)

(a) Remove the front seat cushion frame sub-assembly LH (lifter motor) (See page ).

(b) Inspect the front seat cushion frame sub-assembly LH (lifter motor) (See page ).

NG

REPLACE FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH

OK

6.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH)

(a) Disconnect the Z9 position control ECU and switch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Z9-10 (LFT+) - Z4-1

Always

Below 1 Ω

Z9-12 (LFT-) - Z4-2

Always

Below 1 Ω

Z9-10 (LFT+) or Z4-1 - Body ground

Always

10 kΩ or higher

Z9-12 (LFT-) or Z4-2 - Body ground

Always

10 kΩ or higher

OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Front Vertical Sensor Malfunction (B2652)

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