Toyota Tundra. Manual — part 2708

Fail-Safe Operation

FAIL-SAFE CHART

1. FAIL-SAFE FUNCTION

a. If a malfunction in the tilt position sensor signal or telescopic position sensor signal occurs while

operating the power tilt or power telescopic function, the tilt and telescopic ECU stops the
operation of the power tilt and power telescopic steering column system.

b. If the power voltage to the ECU drops below approximately 8 V while operating the power tilt or

power telescopic function, the ECU stops the operation of the power tilt and power telescopic
steering column system.

c. If the tilt and telescopic ECU detects that the motor has locked during the operation of the power

tilt or power telescopic function, the ECU stops the operation of the power tilt and power telescopic
steering column system.

d. If the communication of an ECU that is related to the power tilt and power telescopic steering

column system is interrupted, the system operates as shown below.

COMMUNICATION CHART

DTC

Code

Detection Item

Fail-safe

B2602

Key Unlock Warning Switch Circuit
Malfunction

The auto away function stops. Auto return
function:



Continues (when the ignition switch is
ON).



Stops (when the ignition switch is OFF).

B2603

Tilt and Telescopic Manual Switch Circuit
Malfunction

The tilt and telescopic operation by manual
switch is suspended.

B2610

Tilt Position Sensor or Tilt Motor Circuit
Malfunction

The tilt operation is suspended.

B2611

Telescopic Position Sensor or Telescopic Motor
Circuit Malfunction

The telescopic operation is suspended.

B2620 ECU Power Source Circuit Malfunction

The tilt and telescopic operation is suspended.

B2624 Speed Signal Malfunction

The auto away and/or auto return function
stops.

Function

Main Body ECU

Communication

Interruption

Outer Mirror

Control ECU

Communication

Interruption

Front Power Seat

Control ECU and

Switch LH

Communication

Interruption

All ECUs (*1)

Communication

Interruption

Manual

X (*2)

o

o

X (*2)

Automatic

Away

X

X

o

X

Automatic

X (*3)

X (*3)

o

X (*3)

2009 Toyota Tundra

2009 STEERING Steering Column - Tundra

DATA LIST/ACTIVE TEST

1. READ DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensor, actuators and
other items to be read without removing any parts. This non-intrusive inspection can be very useful
because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading
the Data List information early in troubleshooting is one way to save diagnostic time.

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream on.

d. Enter the following menus: Body/Tilt & Telescopic/Data List.

e. Check the values by referring to the table below.

Tilt & Telescopic

TILT AND TELESCOPIC - DATA LIST

Return

Memory

X

X

X

X

HINT:



*1: All ECUs that are related to the power tilt and power telescopic steering column system.



*2: The operation is permitted if the ignition switch signal is ON while the signal from the
main body ECU is interrupted.

The operation is prohibited if the ignition switch signal is OFF while the signal from the
main body ECU is interrupted.



*3: If the signal (s) from the ECU is/are interrupted after the operation has started, the
operation will be continued when the ignition switch signal is ON, and prohibited when the
ignition switch signal is OFF.

NOTE:

In the table below, the values listed under "Normal Condition" are
reference values. Do not depend solely on these reference values when
deciding whether a part is faulty or not.

Tester

Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

Tilt Position

Current tilt position data/min.: 0000 H
(0 edges), max.: FFFF H (65535 edges)

7000 to 9000 H (28672 to
36864 edges)

-

Telesco

Current telescopic position data/min.:
0000 H (0 edges), max.: FFFF H (65535 7000 to 9000 H (28672 to

-

2009 Toyota Tundra

2009 STEERING Steering Column - Tundra

Position

edges)

36864 edges)

Tilt Return
Position

Memorized tilt return position
data/min.: 0000 H (0 edges), max.:
FFFF H (65535 edges)

7000 to 9000 H (28672 to
36864 edges)

-

Telesco Return
Position

Memorized telescopic return position
data/min.: 0000 H (0 edges), max.:
FFFF H (65535 edges)

7000 to 9000 H (28672 to
36864 edges)

-

Tilt Memory
Pos 1

Tilt data of memory position 1/min.:
0000 H (0 edges), max.: FFFF H (65535
edges)

7000 to 9000 H (28672 to
36864 edges)

-

Telesco
Memory Pos 1

Telescopic data of memory position
1/min.: 0000 H (0 edges), max.: FFFF H
(65535 edges)

7000 to 9000 H (28672 to
36864 edges)

-

Tilt Memory
Pos 2

Tilt data of memory position 2/min.:
0000 H (0 edges), max.: FFFF H (65535
edges)

7000 to 9000 H (28672 to
36864 edges)

-

Telesco
Memory Pos 2

Telescopic data of memory position
2/min.: 0000 H (0 edges), max.: FFFF H
(65535 edges)

7000 to 9000 H (28672 to
36864 edges)

-

Tilt Memory
Pos 3

Tilt data of memory position 3/min.:
0000 H (0 edges), max.: FFFF H (65535
edges)

7000 to 9000 H (28672 to
36864 edges)

-

Telesco
Memory Pos 3

Telescopic data of memory position
3/min.: 0000 H (0 edges), max.: FFFF H
(65535 edges)

7000 to 9000 H (28672 to
36864 edges)

-

Tilt Up Limit

Uppermost tilt position/Not Mem or
Mem

Not Mem: Position is not
memorized
Mem: Position is
memorized

-

Tilt Up Limit
Position

Uppermost tilt position data/min.: 0000
H (0 edges), max.: FFFF H (65535
edges)

7000 to 9000 H (28672 to
36864 edges)

-

Tilt Down
Limit

Lowermost tilt position/Not Mem or
Mem

Not Mem: Position is not
memorized
Mem: Position is
memorized

-

Tilt Down
Limit Position

Lowermost tilt position data/min.: 0000
H (0 edges), max.: FFFF H (65535
edges)

7000 to 9000 H (28672 to
36864 edges)

-

Telesco Short
Limit

Shortest telescopic position/Not Mem or
Mem

Not Mem: Position is not
memorized
Mem: Position is
memorized

-

Telesco Short
Limit Pos

Shortest telescopic position data/min.:
0000 H (0 edges), max.: FFFF H (65535
edges)

7000 to 9000 H (28672 to
36864 edges)

-

2009 Toyota Tundra

2009 STEERING Steering Column - Tundra

Telesco Long
Limit

Longest telescopic position/Not Mem or
Mem

Not Mem: Position is not
memorized
Mem: Position is
memorized

-

Telesco Long
Limit Pos

Longest telescopic position data/min.:
0000 H (0 edges), max.: FFFF H (65535
edges)

7000 to 9000 H (28672 to
36864 edges)

-

Tilt Up Switch

Input state of tilt up by manual
switch/ON or OFF

ON: Tilt up is activated by
manual switch
OFF: Tilt up is not activated
by manual switch

-

Tilt Up SW
(CAN)

Communication state of tilt up input by
manual switch/ON or OFF

ON: Tilt up is activated by
manual switch
OFF: Tilt up is not activated
by manual switch

-

Tilt Down
Switch

Input state of tilt down by manual
switch/ON or OFF

ON: Tilt down is activated
by manual switch
OFF: Tilt down is not
activated by manual switch

-

Tilt Down SW
(CAN)

Communication state of tilt down input
by manual switch/ON or OFF

ON: Tilt down is activated
by manual switch
OFF: Tilt down is not
activated by manual switch

-

Telesco Short
Switch

Input state of telescopic short by manual
switch/ON or OFF

ON: Telescopic short is
activated by manual switch
OFF: Telescopic short is not
activated by manual switch

-

Telesco Short
SW (CAN)

Communication state of telescopic short
input by manual switch/ON or OFF

ON: Telescopic short is
activated by manual switch
OFF: Telescopic short is not
activated by manual switch

-

Telesco Long
Switch

Input state of telescopic long by manual
switch /ON or OFF

ON: Telescopic long is
activated by manual switch
OFF: Telescopic long is not
activated by manual switch

-

Telesco Long
SW (CAN)

Communication state of telescopic long
input by manual switch/ON or OFF

ON: Telescopic long is
activated by manual switch
OFF: Telescopic long is not
activated by manual switch

-

T&T Manual
SW Data

Voltage data of manual switch/min.: 0
V, max.: 5 V

Neutral position: Below 0.2
V
Tilt up: 1.67 to 2.13 V
Tilt down: 0.54 to 0.74 V
Telescopic contract: 1.08 to
1.40 V
Telescopic extend: 2.22 to

-

2009 Toyota Tundra

2009 STEERING Steering Column - Tundra