Toyota Tundra. Manual — part 2716

Fig. 38: Identifying J47 Multiplex Tilt & Telescopic ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.

3. CHECK HARNESS AND CONNECTOR (MULTIPLEX TILT AND TELESCOPIC ECU - BODY

GROUND)

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION TABLE

J47-9 (ECUB) - Body ground Always

11 to 14 V

Tester Connection

Condition Specified Condition

J47-11 (GND) - Body ground Always

Below 1 ohms

2009 Toyota Tundra

2009 STEERING Steering Column - Tundra

Fig. 39: Identifying J47 Multiplex Tilt & Telescopic ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (See MULTIPLEX TILT AND
TELESCOPIC ECU (for Power Tilt and Power Telescopic Steering Column) )

DTC B2621: COMMUNICATION INTERRUPTION

DESCRIPTION

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the
communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a
specified signal (periodic signal) to the communication bus on a regular schedule. The multiplex tilt and
telescopic ECU detects the connection of each ECU based on the signal.

DETECTION CONDITION AND TROUBLE AREA TABLE

INSPECTION PROCEDURE

1. CHECK DTC (CAN COMMUNICATION SYSTEM)

a. Check for DTCs of the CAN communication system (see CAN COMMUNICATION SYSTEM ).

DTC

Code

Detection Condition

Trouble Area

B2621

The periodic signal from a specified ECU has
stopped.



CAN communication system



Main body ECU



Front power seat control ECU and
switch LH



Combination meter



Multiplex tilt and telescopic ECU

2009 Toyota Tundra

2009 STEERING Steering Column - Tundra

Result

RESULT REFERENCE TABLE

B: GO TO CAN COMMUNICATION SYSTEM (See CAN COMMUNICATION SYSTEM )

A: Go to next step.

2. READ VALUE USING TECHSTREAM (MAIN BODY ECU COMMUNICATION SIGNAL)

a. Use the Data List to check if the main body ECU communication signal is functioning properly.

Tilt & Telescopic

TILT AND TELESCOPIC - DATA LIST TABLE

OK: "OK" is displayed.

NG: REPLACE MAIN BODY ECU

OK: Go to next step.

3. READ VALUE USING TECHSTREAM (FRONT POWER SEAT CONTROL ECU AND

SWITCH LH COMMUNICATION SIGNAL)

a. Use the Data List to check if the front power seat control ECU and switch LH communication

signal is functioning properly.

Tilt & Telescopic

TILT AND TELESCOPIC - DATA LIST TABLE

Result

Proceed to

DTC is not output

A

DTC is output

B

Tester

Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

J/B

Communication state of main body ECU
signal/OK or Interruption

OK: Communication is
normal
Interruption: Communication
is interrupted

-

Tester

Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

Receive from

Seat ECU

Communication state of front power seat
control ECU and switch LH signal/OK or
Interruption

OK: Communication is
normal
Interruption:
Communication is
interrupted

-

2009 Toyota Tundra

2009 STEERING Steering Column - Tundra

OK: "OK" is displayed.

NG: REPLACE FRONT POWER SEAT CONTROL ECU AND SWITCH LH (DRIVER SEAT
ECU) (See SEAT MEMORY SWITCH (W/ SEAT POSITION MEMORY SYSTEM) )

OK: Go to next step.

4. READ VALUE USING TECHSTREAM (COMBINATION METER ECU COMMUNICATION

SIGNAL)

a. Use the Data List to check if the combination meter ECU communication signal is functioning

properly.

Tilt & Telescopic

TILT AND TELESCOPIC - DATA LIST

OK: "OK" is displayed.

NG: REPLACE COMBINATION METER ASSEMBLY (COMBINATION METER ECU) (See
COMBINATION METER )

OK: REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (See MULTIPLEX TILT AND
TELESCOPIC ECU (for Power Tilt and Power Telescopic Steering Column) )

DTC B2624: VEHICLES SPEED MALFUNCTION

DESCRIPTION

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the
communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a
specified signal (periodic signal) to the communication bus on a regular schedule. The multiplex tilt and
telescopic ECU receives vehicle speed signals from the combination meter via the communication bus to
prevent improper operation of the auto away/return function during driving.

DETECTION CONDITION AND TROUBLE AREA TABLE

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

Receive from

Meter ECU

Communication state of combination
meter signal/OK or Interruption

OK: Communication is
normal
Interruption:
Communication is
interrupted

-

DTC

Code

Detection Condition

Trouble Area

When either condition below is met:



CAN communication
system

2009 Toyota Tundra

2009 STEERING Steering Column - Tundra