Toyota Tundra Service Manual: Reclining Sensor Malfunction (B2651)

DESCRIPTION

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

DTC Code

DTC Detection Condition

Trouble Area

B2651

The forward and rearward lock detection position of the sensor is the same.

  • Position control ECU and switch assembly
  • Front seatback frame sub-assembly LH (reclining motor)
  • Harness or connector

WIRING DIAGRAM

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (SEAT RECLINING)

(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 Ranger

Diagnostic Note

Seat Reclining

Seat reclining operation

Front / OFF / Rear

-

OK:

Motor operates normally.

NG

GO TO STEP 5

OK

2.

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

(a) Disconnect the front seatback frame sub-assembly LH (reclining motor) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z6-4 - Z6-3

Reclining switch on

4.8 to 5.1 V

Text in Illustration

*a

Front view of wire harness connector

(to Front Seatback Frame Sub-assembly LH [Reclining Motor])

NG

GO TO STEP 4

OK

3.

CHECK FRONT SEATBACK FRAME SUB-ASSEMBLY LH (RECLINING MOTOR)

(a) Reconnect the front seatback frame sub-assembly LH (reclining motor) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

Z6-4 - Body ground

Reclining switch on

4.5 to 4.8 V

Text in Illustration

*a

Component with harness connected

(Front Seatback Frame Sub-assembly LH [Reclining Motor])

OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

NG

REPLACE FRONT SEATBACK FRAME SUB-ASSEMBLY LH

4.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - FRONT SEATBACK 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

Z10-11 (SSRR) - Z6-4

Always

Below 1 Ω

Z10-1 (SGND) - Z6-3

Always

Below 1 Ω

Z10-11 (SSRR) or Z6-4 - Body ground

Always

10 kΩ or higher

Z10-1 (SGND) or Z6-3 - 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 SEATBACK FRAME SUB-ASSEMBLY LH (RECLINING MOTOR)

(a) Remove the front seatback frame sub-assembly LH (reclining motor) (See page ).

(b) Inspect the front seatback frame sub-assembly LH (reclining motor) (See page ).

NG

REPLACE FRONT SEATBACK FRAME SUB-ASSEMBLY LH

OK

6.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - FRONT SEATBACK 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

Z9-9 (RCL+) - Z6-2

Always

Below 1 Ω

Z9-11 (RCL-) - Z6-1

Always

Below 1 Ω

Z9-9 (RCL+) or Z6-2 - Body ground

Always

10 kΩ or higher

Z9-11 (RCL-) or Z6-1 - Body ground

Always

10 kΩ or higher

OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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