Toyota Tundra (2015 year). Manual — part 2456

Last Modified: 9-16-2014

6.6 C

Doc ID: RM000003S3M025X

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 - ]

Title: SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): B2651; Reclining Sensor Malfunction; 2015

MY Tundra [08/2014 - ]

DTC

B2651

Reclining Sensor Malfunction

DESCRIPTION

When the position control ECU and switch assembly does not receive a sensor signal despite forward or rearward

CODE

DTC DETECTION CONDITION

TROUBLE AREA

B2651

The forward and rearward lock detection position

assembly

Front seatback frame sub-assembly LH

(reclining motor)

Harness or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (SEAT RECLINING)

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): B265...

OK

(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

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

NG

GO TO STEP 4

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): B265...

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])

NG

REPLACE FRONT SEATBACK FRAME SUB-ASSEMBLY

LH

OK

REPLACE POSITION CONTROL ECU AND SWITCH

ASSEMBLY

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

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): B265...

OK

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE POSITION CONTROL ECU AND SWITCH

ASSEMBLY

5.

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

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

.

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

.

NG

REPLACE FRONT SEATBACK FRAME SUB-ASSEMBLY

LH

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE POSITION CONTROL ECU AND SWITCH

ASSEMBLY

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): B265...